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 $E\lesssim$ 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.

PT Journal Article
TI Experiments with cold hydrogen atoms
AU Leonas V B
FAU Leonas VB
DP 10 Apr, 1981
TA Phys. Usp.
VI 24
IP 4
PG 318-330
RX 10.1070/PU1981v024n04ABEH004811
URL https://ufn.ru/en/articles/1981/4/d/
SO Phys. Usp. 1981 Apr 10;24(4):318-330