Abstract
This review examines the numerous studies performed in recent years on atomic processes involving cold hydrogen atoms in the gas phase and at a surface. The term cold atom denotes the range of relative collision energies E < 10 meV (correspondingly, ultracold atoms have E 1 meV). This corresponds to the temperature range of tens (or units) of kelvins. Three main fields of study in which extensive experimental programs have been realized are treated: the study of collision processes involving hydrogen atoms, which are of astrophysical interest; the study of elastic atom-molecule scattering at ultralow energies; and studies on the problem of condensed hydrogen. The fundamental technical means of realization and the results obtained from the studies are discussed.
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