Abstract
The 9·3 keV Mössbauer transition in 83Kr, populated from ( n, γ) produced by 83Se by a two beta decay sequence, has been used to study the extent of chemical bonding between the krypton atom and its nearest neighbor environment in metallic selenium, SeO 2, (NH 4)SeO 4, and the question of chemical bonding in krypton- hydroquinone clathrate (HQKr) has been re-examined. Using a standard HQKr absorber the largest resonance effect and a significantly broadened resonance line are observed with an SeO 2 source. Only a very small room temperature resonance effect is observed with the (NH 4) 2SeO 4 source. These results are interpreted in terms of the dependence of the magnitude of the recoil-free fraction on the existence of long-range order in the source host matrix and an estimate of the nuclear quadrupole hyperfine interaction based on previously reported data for KrF 2. The present data indicate the existence of a bona fide KrO bond in the SeO 2 and HQKr host matrices.
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