Title :
Atomic hydrogen spin-exchange frequency shift cross section at 0.5 Kelvin
Author :
Hayden, M.E. ; Hürlimann, M.D. ; Hardy, W.N.
Author_Institution :
Dept. of Phys., British Columbia Univ., Vancouver, BC, Canada
Abstract :
We present an accurate measurement of the dominant hydrogen atom spin-exchange frequency shift cross section at 0.5 K, made using a recirculating cryogenic hydrogen maser. This parameter is sensitive to the detailed form of the H-H interaction potentials, particularly at large interatomic separations, and thus provides a means for testing the accuracy of ab-initio potentials. We find λ¯0=-21.7±2.8 Å2, whereas the most sophisticated theoretical calculations to date give λ¯0=-11.8 Å2
Keywords :
atomic beams; atomic collisions; atomic structure; frequency stability; hydrogen; hyperfine structure; masers; measurement standards; 0.5 K; H; H atom; H-H interaction; atomic hyperfine transitions; interatomic separations; measurement; recirculating cryogenic hydrogen maser; spin-exchange frequency shift cross section; testing; Atomic measurements; Frequency measurement; Hydrogen; Kelvin; Masers; Physics; Stability; Temperature; Testing; Tuning;
Conference_Titel :
Frequency Control Symposium, 1994. 48th., Proceedings of the 1994 IEEE International
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-1945-1
DOI :
10.1109/FREQ.1994.398262
