Hyperfine pressure shift of hydrogen in helium

D. A.N. Kunik*, U. Z.I. Kaldor

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The hyperfine pressure shift (HPS) of hydrogen atoms in a helium atmosphere is calculated over a wide temperature range (50-700°K). Results are not very sensitive to the exact form of the H-He potential, but depend strongly on the values of the spin density at the hydrogen nucleus at different H-He interatomic separations. Spin densities are evaluated by the spin-optimized self-consistent-field (SOSCF) method and are corrected for the long-range Van der Waals interaction. It is argued that long-range spin density shifts are indeed negative as suggested by several previous calculations, in contrast with a recent five-configuration treatment. Our results are 20%-25% higher than experimental values. Most of the error is attributed to the uncertainties concerning the method of including long-range effects.

Original languageEnglish
Pages (from-to)4125-4127
Number of pages3
JournalThe Journal of Chemical Physics
Issue number8
StatePublished - 1971


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