~(87)Rb atomic frequency standard

A-Bomb (=atomic bomb)

absolute atomic weight

acetylene flame atomic absorption spectrophotometr

Advisory Committee of the International Conference on the Peaceful Uses of Atomic Energy

Air-Acetylene Flame Atomic Absorption Spectrometry

air-acetylene flame atomic absorption spectroscopy

air-atomic

AIR-C2H2 flame atomic absorption

almost atomic nest

Ames Institute of Atomic Research

an atomic cocktail

an atomic effort

Analysis of the atomic emission spectrum

analytical atomic spectroscopy

anomalous atomic scattering factor

anomalous atomic scattering method

anomalous dispersion atomic optical filter

AO atomic orbital