{ "id": "epcd7p4q12", "slug": "light-scattering", "title": "Light scattering", "updated": "2026-10-15", "topic_path": [ { "id": "physical", "label": "Physical world and mathematics", "api_url": "https://www.edgepedia.org/api/v1/topics/physical" }, { "id": "physical.physics", "label": "Physics", "api_url": "https://www.edgepedia.org/api/v1/topics/physical.physics" }, { "id": "physical.physics.practice", "label": "Physics methods, practice, and community", "api_url": "https://www.edgepedia.org/api/v1/topics/physical.physics.practice" }, { "id": "physical.physics.practice.flow-and-particle-diagnostics", "label": "Flow and particle diagnostics", "api_url": "https://www.edgepedia.org/api/v1/topics/physical.physics.practice.flow-and-particle-diagnostics" } ], "geo": [ { "id": "geo.nongeo.t1800.physical.physics.practice", "label": "Non-geographic · 1800 to 1945: Physics methods, practice, and community", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1800.physical.physics.practice", "path": [ { "id": "geo.nongeo", "label": "Non-geographic", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo" }, { "id": "geo.nongeo.t1800", "label": "Non-geographic · 1800 to 1945", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1800" }, { "id": "geo.nongeo.t1800.physical", "label": "Physical world and mathematics", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1800.physical" }, { "id": "geo.nongeo.t1800.physical.physics", "label": "Physics", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1800.physical.physics" }, { "id": "geo.nongeo.t1800.physical.physics.practice", "label": "Physics methods, practice, and community", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1800.physical.physics.practice" } ] }, { "id": "geo.nongeo.t1946.physical.physics.practice", "label": "Non-geographic · 1946 to 2000: Physics methods, practice, and community", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.physical.physics.practice", "path": [ { "id": "geo.nongeo", "label": "Non-geographic", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo" }, { "id": "geo.nongeo.t1946", "label": "Non-geographic · 1946 to 2000", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946" }, { "id": "geo.nongeo.t1946.physical", "label": "Physical world and mathematics", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.physical" }, { "id": "geo.nongeo.t1946.physical.physics", "label": "Physics", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.physical.physics" }, { "id": "geo.nongeo.t1946.physical.physics.practice", "label": "Physics methods, practice, and community", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.physical.physics.practice" } ] } ], "excerpt": "Light scattering is the deviation of light from a straight path when it interacts with particles, macromolecules, or colloids, also used to measure size and molar mass.", "snippet": "Light scattering is the deviation of light from a straight path when it interacts with particles, macromolecules, or colloids, also used to measure size and molar mass.", "node": "physical.physics.practice.flow-and-particle-diagnostics", "markdown": "# Light scattering\n\nLight scattering is a physical phenomenon in which light deviates from a straight-line trajectory when it interacts with particles, macromolecules, or colloids; measurement techniques analyze the scattered light in order to determine particle size and molar mass in solution.[32](https://technav.ieee.org/topic/optical-scattering/) The main branches are static light scattering (SLS), which measures time-averaged intensity to yield molar mass and radius of gyration; dynamic light scattering (DLS), which measures intensity fluctuations from [Brownian motion](https://www.edgepedia.org/brownian-motion) to yield hydrodynamic size; and [multi-angle light scattering](https://www.edgepedia.org/multi-angle-light-scattering) (MALS), which measures intensity at several angles simultaneously, most often coupled to size-exclusion chromatography (SEC).[1](https://arxiv.org/pdf/1810.00611) DLS is also called quasi-elastic light scattering (QELS) and photon correlation spectroscopy (PCS).[2](https://webstore.ansi.org/standards/iso/iso224122017)\n\n| Key fact | Value |\n|---|---|\n| SLS outputs | Weight-average molar mass, radius of gyration, second virial coefficient on an absolute scale[3](https://www.fz-juelich.de/en/ibi/ibi-4/downloads/lang_002/@@download/file/Lang_002.pdf) |\n| DLS outputs | Intensity-weighted harmonic mean (z-average) hydrodynamic diameter[4](https://cdn.standards.iteh.ai/samples/iso/iso-22412-2025/cbd726a36eff42918667d750258f7777/iso-22412-2025.pdf) |\n| DLS size range | Roughly 1 nm to 1000 nm, from small proteins to viruses and bacteria[1](https://arxiv.org/pdf/1810.00611) |\n| MALS ranges (DAWN-class detector) | Molar mass 1 Da to 1 GDa; radius of gyration 10 to 500 nm; 18-angle temperature-controlled flow cell[5](https://ostr.ccr.cancer.gov/wp-content/uploads/2023/07/MALS-FFF-1.pdf) |\n| DLS accuracy | Relative expanded uncertainty of the z-average ≤3% on narrow-distribution 100 nm materials; higher for polydisperse samples[6](https://cdn.standards.iteh.ai/samples/73972/3eec0af3b4c647bb8691ffac8d6019a8/ISO-TR-22814-2020.pdf) |\n| Practical MALS limit | Approximately 10 kDa for proteins; 10–20 ng of BSA suffices for good data[5](https://ostr.ccr.cancer.gov/wp-content/uploads/2023/07/MALS-FFF-1.pdf) |\n\n## How it works\n\nStatic (elastic) scattering measures the time-averaged intensity of light scattered at each angle. For dilute solutions the excess Rayleigh ratio, the solution scattering minus the solvent scattering, carries the molar mass \\( M \\), the radius of gyration \\( R_{G} \\), and the second virial coefficient \\( A_{2} \\).[7](http://www.chem.cmu.edu/groups/Berry/scattering98.pdf) Scattered intensity is directly proportional to the product of weight-average molar mass and concentration, \\( LS \\sim M_{w} \\cdot c \\), which is what makes absolute mass determination possible.[8](https://medicine.yale.edu/keck/biophysics/technologies/lightscatter/theory/)\n\nThe applicable theory depends on particle size. Particles with diameter below one tenth of the laser wavelength (about 60 nm for a 633 nm He-Ne laser) are Rayleigh scatterers with isotropic intensity proportional to the sixth power of diameter, \\( I \\propto d^{6} \\).[9](https://www.chem.uci.edu/~dmitryf/manuals/Fundamentals/DLS%20concept.pdf) The Rayleigh-Gans-Debye (RGD) approximation is usually appropriate for dilute polymer solutions and adequate for dilute dispersions of small particles; the Mie-Lorentz theory is used for large spherical particles.[10](http://www.chem.cmu.edu/groups/Berry/scattering15.pdf)\n\nDynamic (quasi-elastic) scattering instead records fluctuations of the scattered intensity caused by Brownian motion. The principal measured quantity in dynamic work is the photon count autocorrelation function \\( G_{2}(\\tau; q) \\), computed for a scattering vector modulus \\( q = (4\\pi n/\\lambda)\\sin(\\vartheta/2) \\).[7](http://www.chem.cmu.edu/groups/Berry/scattering98.pdf) Under homodyne, random Gaussian conditions, \\( G_{2} \\) relates to the field autocorrelation through the Siegert relationship.[11](https://www.eng.uc.edu/~beaucag/Classes/Characterization/DLS/PaulRussoLSU2012DLS_Minicourse.pdf)\n\n## How it is done\n\nIn SLS, a laser passes through the sample and intensity is measured at a fixed angle, typically 90°, which gives the best signal-to-noise ratio for weakly scattering samples. A concentration series of at least four concentrations plus pure solvent is measured, and commercial instruments are calibrated against a reference solvent of known Rayleigh ratio, most often toluene or benzene.[12](https://wiki.anton-paar.com/en/molecular-mass-measurement-using-static-light-scattering/) For particles larger than roughly \\( \\lambda_{0}/20 \\), the angular form factor cannot be neglected and multi-angle measurement is required.[12](https://wiki.anton-paar.com/en/molecular-mass-measurement-using-static-light-scattering/)\n\nThe Debye-Zimm equation, \\( K \\cdot c/\\Delta R = 1/(M_{w}P(\\theta)) + 2A_{2} \\cdot c \\), with \\( K = 4\\pi^{2}(dn/dc)^{2}n_{0}^{2}/(N_{A} \\cdot \\lambda_{0}^{4}) \\), is the theoretical basis of SLS.[12](https://wiki.anton-paar.com/en/molecular-mass-measurement-using-static-light-scattering/) In the Zimm plot, \\( K^{*} \\cdot c/R(Q) \\) is plotted against \\( \\sin^{2}(Q/2) \\) and concentration; the intercept gives \\( M_{w} \\), the angular slope extrapolated to \\( c = 0 \\) gives \\( R_{g} \\), the concentration slope extrapolated to \\( \\theta = 0 \\) gives \\( A_{2} \\), and the two extrapolations share a common intercept.[8](https://medicine.yale.edu/keck/biophysics/technologies/lightscatter/theory/) • [1](https://arxiv.org/pdf/1810.00611)\n\nIn DLS, the decay of \\( G_{2}(\\tau) \\) yields the translational diffusion coefficient, converted to hydrodynamic radius by the Stokes-Einstein relation, \\( R_{H} = k \\cdot T/(6\\pi\\eta_{s} \\cdot D) \\).[7](http://www.chem.cmu.edu/groups/Berry/scattering98.pdf) Because \\( D \\) is concentration-dependent, it should be measured at several concentrations and extrapolated to infinite dilution, then converted to standard conditions (water, 20 °C).[13](https://pmc.ncbi.nlm.nih.gov/articles/PMC5425802/) The cumulants analysis, defined in ISO 13321 (1996) and ISO 22412 (2008), gives the z-average size and a polydispersity index from 0 to 1; the CONTIN constrained regularization algorithm represents the correlation function as an integral over a distribution of decay rates for multimodal samples.[9](https://www.chem.uci.edu/~dmitryf/manuals/Fundamentals/DLS%20concept.pdf) • [1](https://arxiv.org/pdf/1810.00611)\n\nIn SEC-MALS, the chromatograph separates the sample and the MALS detector records \\( R(\\theta) \\) across each peak; at the low eluent concentrations in the detector, \\( M_{w} \\) can be determined from the light scattering detector alone if the calibration constant, \\( dn/dc \\), and injected mass are known.[7](http://www.chem.cmu.edu/groups/Berry/scattering98.pdf) For proteins, \\( dn/dc \\) is approximately 0.19 mL/g and nearly independent of amino acid composition.[8](https://medicine.yale.edu/keck/biophysics/technologies/lightscatter/theory/)\n\n## Origin\n\nThe theoretical line runs from the scattering equation for an ideal gas, through the fluctuation theory of fluids and the theory of scattering by large particles; the standard reference on absorption and scattering by small particles is the book by Craig F. Bohren and Donald R. Huffman, first published in 1983.[3](https://www.fz-juelich.de/en/ibi/ibi-4/downloads/lang_002/@@download/file/Lang_002.pdf) • [14](https://link.springer.com/rwe/10.1007/978-1-4020-4465-6_7) • [15](https://doi.org/10.1002/9783527618156) A 1948 paper by [Bruno H. Zimm](https://www.edgepedia.org/bruno-h-zimm) in The Journal of Chemical Physics described a photoelectric apparatus for measuring the angular dependence of light scattering from solutions, with calculation methods for determining the average extension of the scattering molecules, demonstrated on polystyrene fractions.[16](https://doi.org/10.1063/1.1746740)\n\nFor dynamic scattering, H. Z. Cummins, N. Knable, and Y. Yeh reported the observation of diffusion broadening of Rayleigh scattered light in [Physical Review Letters](https://www.edgepedia.org/physical-review-letters) in 1964.[17](https://doi.org/10.1103/physrevlett.12.150) The method of cumulants for polydispersity analysis was presented by Dennis E. Koppel in The Journal of Chemical Physics in 1972,[18](https://doi.org/10.1063/1.1678153) and the exponential sampling method by Nicole Ostrowsky and colleagues in Optica Acta in 1981.[19](https://doi.org/10.1080/713820704) Philip J. Wyatt's 1993 Analytica Chimica Acta paper, \"Light scattering and the absolute characterization of macromolecules,\" is cited as a modern classic on online and offline MALS.[20](https://doi.org/10.1016/0003-2670%2893%2980373-s) • [21](https://www.nature.com/articles/s43586-025-00410-1) Commercial multi-angle systems generating the scattering function from flowing solutions have been available since 1986, spanning three to eighteen or more detection angles.[22](https://pmc.ncbi.nlm.nih.gov/articles/PMC8406046/) RT-MALS as a process analytical technology for real-time molecular weight in downstream process control was introduced by Bhumit A. Patel and colleagues in mAbs in 2018,[23](https://doi.org/10.1080/19420862.2018.1505178) and the machine-learning light scattering method for aerosol sizing was reported by Jin Zeng and Jingjing Xia in ACS Sensors in 2024.[24](https://doi.org/10.1021/acssensors.3c02009)\n\n## Variants\n\nNaming reflects geometry and time domain. SLS denotes the static technique generally; MALS distinguishes multi-detector instruments from earlier single low-angle instruments, and the abbreviation DLS shifted from \"differential light scattering\" to dynamic light scattering as photon correlation spectroscopy took over.[22](https://pmc.ncbi.nlm.nih.gov/articles/PMC8406046/) DLS instruments detect at 90° or in backscatter at 173° or 158°, the latter allowing measurement of highly concentrated samples by avoiding multiple scattering.[13](https://pmc.ncbi.nlm.nih.gov/articles/PMC5425802/) Multi-angle DLS (MADLS) combines correlograms from three angles (backscatter, 90°, forward scatter), improving sizing resolution typically from 3:1 to 2:1 and reducing angular dependence.[25](https://www.malvernpanalytical.com/br/learn/knowledge-center/whitepapers/wp180926improvedcomponentresolutionmadls) Other named variants include diffusing wave spectroscopy (DWS), two-color cross-correlation DLS, depolarized DLS, and gated cross-correlation DLS.[11](https://www.eng.uc.edu/~beaucag/Classes/Characterization/DLS/PaulRussoLSU2012DLS_Minicourse.pdf) Hyphenated forms add separation: SEC-MALS, field-flow fractionation MALS (FFF-MALS), and μMALS, a micro-MALS design introduced by Vincent H. Hsieh and Philip J. Wyatt in [Scientific Reports](https://www.edgepedia.org/scientific-reports) in 2017 that makes MALS compatible with SE-UHPLC peaks.[26](https://www.nature.com/articles/s41598-017-09051-1) RT-MALS integrates MALS in-line with process equipment for real-time molar mass and size.[23](https://doi.org/10.1080/19420862.2018.1505178) The third edition of the DLS standard, ISO 22412:2025, added multi-angle dynamic light scattering (MADLS), imaging DLS (IDLS and UIDLS), and polarization-separated backscatter photon cross-correlation spectroscopy, replacing the 2017 edition.[4](https://cdn.standards.iteh.ai/samples/iso/iso-22412-2025/cbd726a36eff42918667d750258f7777/iso-22412-2025.pdf)\n\n## Applications\n\nSEC-MALS is principally used for determining the molar mass of natural and synthetic macromolecules and colloidal suspensions.[21](https://www.nature.com/articles/s43586-025-00410-1) The second virial coefficient predicts aggregation tendency: a negative \\( A_{2} \\) suggests aggregation is likely, while a positive value reflects good particle-solvent interactions and stability.[12](https://wiki.anton-paar.com/en/molecular-mass-measurement-using-static-light-scattering/) DLS provides size estimates within a few minutes on commercial instruments and is widely used for nanoparticles, emulsions, and fine bubbles in liquids.[4](https://cdn.standards.iteh.ai/samples/iso/iso-22412-2025/cbd726a36eff42918667d750258f7777/iso-22412-2025.pdf) RT-MALS provides molar mass from 1000 g/mol to 1 billion g/mol and radius from 10 nm to 250 nm; for AAV gene vectors it combines MALS with UV absorbance at 260 and 280 nm to determine capsid and genome molar masses.[27](https://www.wyatt.com/solutions/techniques/real-time-mals.html)\n\n## Limitations and alternatives\n\nDust is a major contamination problem; the dispersant should be filtered, with syringe filters from 1 µm down to 20 nm pore size.[9](https://www.chem.uci.edu/~dmitryf/manuals/Fundamentals/DLS%20concept.pdf) At high concentrations, particle-particle interactions and multiple scattering can produce apparent sizes that differ between concentrated and dilute suspensions.[4](https://cdn.standards.iteh.ai/samples/iso/iso-22412-2025/cbd726a36eff42918667d750258f7777/iso-22412-2025.pdf) Because intensity scales as \\( d^{6} \\), analysis is heavily weighted toward larger particles, so even a small number of agglomerates overshadows the scattering of primary particles and aggregation distorts the size distribution.[28](https://www.tandfonline.com/doi/pdf/10.1080/14686996.2018.1517587) • [29](https://pubs.rsc.org/en/content/articlepdf/2016/ay/c6ay00419a) Converting intensity distributions to volume or number basis is deprecated because of the inherent errors, except for comparative purposes.[6](https://cdn.standards.iteh.ai/samples/73972/3eec0af3b4c647bb8691ffac8d6019a8/ISO-TR-22814-2020.pdf) Angle dependence is a fundamental artifact in polydisperse DLS: higher-\\( q \\) instruments under-sample large particles and report smaller effective hydrodynamic diameters than lower-\\( q \\) instruments on identical samples.[30](https://iopscience.iop.org/article/10.1088/1361-6501/ac42b2) [Resolution](https://www.edgepedia.org/resolution) limits are reported differently: one review states DLS cannot resolve populations whose diffusion coefficients differ by less than a factor of ten,[1](https://arxiv.org/pdf/1810.00611) while a comparative perspective states DLS requires a greater than three-fold size difference for peak resolution.[28](https://www.tandfonline.com/doi/pdf/10.1080/14686996.2018.1517587)\n\nAmong alternatives, nanoparticle tracking analysis (NTA) produces number-based, particle-by-particle distributions including concentration, and resolves peaks differing by less than 50% in size, but DLS detects smaller particles, below the NTA lower detection limit, and offers ISO-standard mean size and PDI for quality control.[28](https://www.tandfonline.com/doi/pdf/10.1080/14686996.2018.1517587) • [31](https://www.malvernpanalytical.com/en/learn/knowledge-center/whitepapers/wp161122nta-dlscomplementarynanocharacterization) For separation before scattering, SEC size limits depend on column pore sizes, generally well below 300 nm, whereas [asymmetric flow field-flow fractionation](https://www.edgepedia.org/asymmetric-flow-field-flow-fractionation) can separate samples often exceeding 1000 nm with superior resolution for high molar mass samples.[22](https://pmc.ncbi.nlm.nih.gov/articles/PMC8406046/) Where MALS gives absolute molar mass, DLS can only estimate molecular mass from an empirical power law based on globular proteins, which is erroneous for non-spherical particles.[1](https://arxiv.org/pdf/1810.00611)\n\n## References\n\n1. [Analytical light scattering methods in molecular and structural biology](https://arxiv.org/pdf/1810.00611)\n2. [ISO 22412:2017 — Particle size analysis — Dynamic light scattering (DLS)](https://webstore.ansi.org/standards/iso/iso224122017)\n3. [Scattering Methods: Basic Principles and Application to Polymer and Colloidal Solutions (Forschungszentrum Jülich lecture notes)](https://www.fz-juelich.de/en/ibi/ibi-4/downloads/lang_002/@@download/file/Lang_002.pdf)\n4. [ISO 22412:2025, Particle size analysis, Dynamic light scattering (DLS)](https://cdn.standards.iteh.ai/samples/iso/iso-22412-2025/cbd726a36eff42918667d750258f7777/iso-22412-2025.pdf)\n5. [NCI CCR facility specification: MALS and FFF/SEC-MALS](https://ostr.ccr.cancer.gov/wp-content/uploads/2023/07/MALS-FFF-1.pdf)\n6. [ISO/TR 22814:2020, Guidance for good practice in DLS](https://cdn.standards.iteh.ai/samples/73972/3eec0af3b4c647bb8691ffac8d6019a8/ISO-TR-22814-2020.pdf)\n7. [Static and Dynamic Light Scattering (G. C. Berry, Encyclopedia of Analytical Chemistry)](http://www.chem.cmu.edu/groups/Berry/scattering98.pdf)\n8. [Light Scatter Theory (Yale Keck Biophysical Resource)](https://medicine.yale.edu/keck/biophysics/technologies/lightscatter/theory/)\n9. [Dynamic Light Scattering Training (Malvern Zetasizer training notes)](https://www.chem.uci.edu/~dmitryf/manuals/Fundamentals/DLS%20concept.pdf)\n10. [Classical (time-averaged) light scattering methods (Berry, Encyclopedia of Analytical Chemistry, longer version)](http://www.chem.cmu.edu/groups/Berry/scattering15.pdf)\n11. [DLS Minicourse (Paul Russo, LSU)](https://www.eng.uc.edu/~beaucag/Classes/Characterization/DLS/PaulRussoLSU2012DLS_Minicourse.pdf)\n12. [Molecular mass measurement using static light scattering (Anton Paar Wiki)](https://wiki.anton-paar.com/en/molecular-mass-measurement-using-static-light-scattering/)\n13. [Dynamic light scattering: a practical guide and applications in biomedical sciences](https://pmc.ncbi.nlm.nih.gov/articles/PMC5425802/)\n14. [Dynamic Light Scattering (Springer Encyclopedia chapter)](https://link.springer.com/rwe/10.1007/978-1-4020-4465-6_7)\n15. [Craig F. Bohren, Donald R. Huffman (1998). Absorption and Scattering of Light by Small Particles. .](https://doi.org/10.1002/9783527618156)\n16. [Bruno H. Zimm (1948). Apparatus and Methods for Measurement and Interpretation of the Angular Variation of Light Scattering; Preliminary Results on Polystyrene Solutions. The Journal of Chemical Physics.](https://doi.org/10.1063/1.1746740)\n17. [H. Z. Cummins, N. Knable, Y. Yeh (1964). Observation of Diffusion Broadening of Rayleigh Scattered Light. Physical Review Letters.](https://doi.org/10.1103/physrevlett.12.150)\n18. [Dennis E. Koppel (1972). Analysis of Macromolecular Polydispersity in Intensity Correlation Spectroscopy: The Method of Cumulants. The Journal of Chemical Physics.](https://doi.org/10.1063/1.1678153)\n19. [Nicole Ostrowsky and colleagues (1981). Exponential Sampling Method for Light Scattering Polydispersity Analysis. Optica Acta International Journal of Optics.](https://doi.org/10.1080/713820704)\n20. [Light scattering and the absolute characterization of macromolecules (Analytica Chimica Acta, 1993)](https://doi.org/10.1016/0003-2670%2893%2980373-s)\n21. [Size-exclusion chromatography with multi-angle static light scattering (Nature Reviews Methods Primers, 2025)](https://www.nature.com/articles/s43586-025-00410-1)\n22. [Differential light scattering and the measurement of molecules and nanoparticles: A review](https://pmc.ncbi.nlm.nih.gov/articles/PMC8406046/)\n23. [Bhumit A. Patel and colleagues (2018). Multi-angle light scattering as a process analytical technology measuring real-time molecular weight for downstream process control. mAbs.](https://doi.org/10.1080/19420862.2018.1505178)\n24. [Jin Zeng, Jingjing Xia (2024). Light Scattering Method for Aerosol Sizing Based on Machine Learning. ACS Sensors.](https://doi.org/10.1021/acssensors.3c02009)\n25. [Improved component resolution with Multi-Angle DLS (MADLS)](https://www.malvernpanalytical.com/br/learn/knowledge-center/whitepapers/wp180926improvedcomponentresolutionmadls)\n26. [Measuring proteins with greater speed and resolution while reducing sample size (μMALS/SE-UHPLC-MALS, Scientific Reports)](https://www.nature.com/articles/s41598-017-09051-1)\n27. [Real-Time MALS (RT-MALS) for Absolute Molar Mass and Size Measurements](https://www.wyatt.com/solutions/techniques/real-time-mals.html)\n28. [Characterisation of particles in solution – a perspective on light scattering and comparative techniques](https://www.tandfonline.com/doi/pdf/10.1080/14686996.2018.1517587)\n29. [A comparison of techniques for size measurement of nanoparticles in cell culture medium (Analytical Methods, RSC)](https://pubs.rsc.org/en/content/articlepdf/2016/ay/c6ay00419a)\n30. [Angle-dependent effects in DLS measurements of polydisperse particles (Meas. Sci. Technol.)](https://iopscience.iop.org/article/10.1088/1361-6501/ac42b2)\n31. [Synergy of complementary nanomaterial characterization techniques (DLS vs NTA, Malvern Panalytical)](https://www.malvernpanalytical.com/en/learn/knowledge-center/whitepapers/wp161122nta-dlscomplementarynanocharacterization)\n32. [Optical scattering, IEEE Technology Navigator](https://technav.ieee.org/topic/optical-scattering/)\n\n---\n*Topic: Encyclopedia › Physical world and mathematics › Physics › Physics methods, practice, and community › Flow and particle diagnostics*\n\n*Initially written Sep 29, 2026 · Edited: Oct 15, 2026*\n\n*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*\n\nLicense: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license\n", "same_as": [ "https://www.chem.uci.edu/~dmitryf/manuals/Fundamentals/DLS%20concept.pdf", "https://www.eng.uc.edu/~beaucag/Classes/Characterization/DLS/PaulRussoLSU2012DLS_Minicourse.pdf" ], "url": "https://www.edgepedia.org/light-scattering", "markdown_url": "https://www.edgepedia.org/light-scattering.md", "license": { "name": "Edgepedia Community License 1.0", "url": "https://www.edgepedia.org/edgepedia/license", "summary": "Free with credit, commercial use included. AI training is open to everyone. For other uses, organizations over USD 100M in revenue or 100M monthly users license separately.", "spdx": "LicenseRef-Edgepedia-Community-1.0" }, "credit": "\"Light scattering\", Edgepedia (EdgeChat), https://www.edgepedia.org/light-scattering. Edgepedia Community License 1.0.", "credit_md": "\"[Light scattering](https://www.edgepedia.org/light-scattering)\", Edgepedia (EdgeChat), [https://www.edgepedia.org/light-scattering](https://www.edgepedia.org/light-scattering). [Edgepedia Community License 1.0](https://www.edgepedia.org/edgepedia/license).", "credit_html": "\"Light scattering\", Edgepedia (EdgeChat), https://www.edgepedia.org/light-scattering. Edgepedia Community License 1.0.", "speakable": "Light scattering is the deviation of light from a straight path when it interacts with particles, macromolecules, or colloids, also used to measure size and molar mass." }