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Atomic Energy Regulatory Board
The Atomic Energy Regulatory Board (AERB) is India's regulator for nuclear and radiation safety, constituted in 1983 under the Atomic Energy Act and based in Mumbai.
Atomic ensemble quantum memory
An atomic ensemble quantum memory stores the quantum state of a light pulse in the collective excitation of a large group of atoms and retrieves it later.
Atomic fluorescence spectroscopy
Atomic fluorescence spectroscopy (AFS), also known as atomic fluorescence spectrometry, is a sensitive analytical technique measuring fluorescence from excited free atoms, best suited to mercury and hydride-forming elements in environmental analysis.
Atomic force microscopy
Atomic force microscopy (AFM) is a scanning probe technique that images surfaces at nanometer to atomic-scale resolution using a sharp tip on a flexible cantilever.
Atomic force microscopy force spectroscopy
Atomic force microscopy force spectroscopy (AFM-FS) uses the sharp tip of a flexible cantilever to press on, pull on, or detach from a sample, measuring molecular-scale forces.
Atomic force microscopy-infrared spectroscopy
Atomic force microscopy-infrared spectroscopy (AFM-IR), also known as photothermal induced resonance (PTIR), is an analytical technique combining atomic force microscopy with infrared spectroscopy, developed by Alexandre Dazzi in 2005.
Atomic fountain
An atomic fountain is a device that tosses laser-cooled atoms upward and lets them fall back, twice through a microwave cavity, extending observation time to about a second.
Atomic Habits
Atomic Habits is a 2018 self-help book by American author James Clear that builds good habits and breaks bad ones through small changes in behavior, environment, and identity.
Atomic Heart
Atomic Heart: 2023 first-person action RPG by Mundfish, set in an alternate 1955 Soviet utopia where agent P-3 fights rogue robots at Facility 3826; Metacritic 70, 10 million players, sequel announced.
Atomic Heart 2
Atomic Heart 2 (Atomic Heart II) is Mundfish's upcoming action-adventure RPG sequel to Atomic Heart, announced June 6, 2025 at Summer Game Fest; retrofuturistic alternate-history setting, global-scale story, Unreal Engine 5, PC and consoles, 2026 release reported.
Atomic Kitten
Atomic Kitten is an English pop girl group from Liverpool formed in the late 1990s by OMD's Andy McCluskey and Stuart Kershaw, who wrote its early material.
Atomic Labs
Atomic Labs is an American venture studio and venture capital fund manager founded by Jack Abraham around 2012, which funds only the startups it co-founds itself.
Atomic layer deposition
Atomic layer deposition (ALD) is a gas-phase thin-film technique developed in Finland in the 1970s that builds films one atomic layer per cycle, coating complex 3D structures and enabling modern transistor fabrication.
Atomic layer etching
Atomic layer etching (ALE) is a semiconductor fabrication technique that removes material one atomic layer at a time using self-limiting sequential surface reactions, the counterpart of atomic layer deposition.
Atomic manipulation
Atomic manipulation is the deliberate placement, removal, or repositioning of individual atoms on a surface, first demonstrated with a scanning tunneling microscope by IBM's Donald Eigler in 1989.
Atomic mass
Atomic mass, also called isotopic mass, is the rest mass of an atom in its ground state, measured in unified atomic mass units and referenced to carbon-12.
Atomic Mass Evaluation
The Atomic Mass Evaluation (AME) is a periodic, peer-reviewed evaluation that combines all published experimental data into a recommended table of atomic mass values with uncertainties.
Atomic model (model theory)
In model theory, an atomic model is a model of a first-order theory whose every realized type is isolated by a single formula, making it a small model.
Atomic norm minimization
Atomic norm minimization is a convex optimization technique, introduced in 2012 by Chandrasekaran, Recht, Parrilo, and Willsky, that generalizes the Lasso to recover sparse signals from continuous, possibly infinite dictionaries.
Atomic nucleus
The atomic nucleus is the small, dense core of protons and neutrons at an atom's center, carrying nearly all of its mass and determining the element's identity.
Atomic number
The atomic number (symbol Z), also called the proton number, is the number of protons in an atom's nucleus, determining which chemical element the atom is.
Atomic orbital
An atomic orbital is a one-electron wavefunction, a solution of the Schrödinger equation for an atom, often pictured as a region holding 90 percent of electron probability.
Atomic packing factor
The atomic packing factor, also called packing efficiency, is the fraction of a crystal's unit-cell volume occupied by atoms modeled as hard spheres; it depends only on the crystal structure.
Atomic parity violation
Atomic parity violation is the tiny mirror asymmetry the weak force induces in atomic states, measurable in optical transitions and used to test the Standard Model.
Atomic physics
Atomic physics is the field of physics that studies the structure of atoms, the energy states of their electrons, and how atoms absorb, emit, and interact with light.
Atomic radii of the elements (data page)
The atomic radii of the elements are tabulated values, in picometers, for atom sizes; since atoms have no sharp edge, data pages list covalent, metallic, ionic, and van der Waals radii.
Atomic radius
The atomic radius, also called atomic size, is a measure of the size of an atom, defined in several ways because atoms have no sharp boundary.
Atomic ratio
An atomic ratio is the quotient of the amounts of two or more elements, expressed as numbers of atoms, within the same system, and underlies chemical formulas and stoichiometry.
Atomic Rooster
Atomic Rooster: British heavy prog/hard rock band formed in London in 1969 by Vincent Crane and Carl Palmer of The Crazy World of Arthur Brown; Hammond-organ-led hits "Tomorrow Night" and "Devil's Answer", revived 2016 with album Circle the Sun (2025).
Atomic Simulation Environment
The Atomic Simulation Environment (ASE) is a free Python library for setting up, running, and analyzing atomistic simulations, begun around 2000 at the Technical University of Denmark.