Abstract
Hyperfine pressure shifts for hydrogen atoms in krypton and xenon were measured by optical pumping. Expressed as fractions of the hyperfine frequency, the shifts are (-10.4 ± 0.2) × 10 -9/ Torr(0° C) and (-20 ± 2) × 10 -9/ Torr (0° C). These shifts are not consistent with theory.
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