Investigation of low temperature atomic hydrogen spin-exchange collisions using a cryogenic hydrogen maser

Journal Article · Sat May 01 00:00:00 EDT 1993 · Bulletin of the American Physical Society

OSTI ID:281611

Walsworth, R L; Mattison, E M; Vessot, R F.C.; Silvera, I F

We have used a cryogenic hydrogen maser to study ground state atomic hydrogen spin-exchange collisions at temperatures near 0.5 K. Recent quantum-mechanical treatments of low energy atomic collisions predict that hyperfine-induced spin-exchange frequency shifts will become large at low temperatures, and will affect the performance of new atomic frequency standards such as the cryogenic hydrogen maser and the cesium fountain. We have measured the effects of low temperature spin-exchange collisions on maser line-broadening and frequency, and in particular the hyperfine-induced frequency shift.

• OSTI ID: 281611
• Report Number(s): CONF-9305421-; ISSN 0003-0503; TRN: 96:019541
• Journal Information: Bulletin of the American Physical Society, Vol. 38, Issue 3; Conference: 1993 American Physical Society annual meeting on atomic, molecular, and topical physics, Reno, NV (United States), 16-19 May 1993; Other Information: PBD: May 1993
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
HYDROGEN
ATOM-ATOM COLLISIONS
SPIN EXCHANGE
MASERS
MICROWAVE RADIATION
HYPERFINE STRUCTURE