Comment on ‘‘Nuclear resonant absorption in long-lived isomeric transitions’’
| Autor: | I.W. Kay, J.D. Silk, D.A. Sparrow, J.F. Nicoll, B. Balko, GH Herling |
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| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | Physical Review B. 48:16139-16141 |
| ISSN: | 1095-3795 0163-1829 |
| Popis: | In a recent paper [R. Coussement [ital et] [ital al]., Phys. Rev. B 45, 9755 (1992)] it was suggested that for a long-lived state that can undergo a Moessbauer transition, if the homogeneously broadened width, rather than the natural width, exceeds the solid-state-induced inhomogeneous width, it should be possible to observe resonant emission and absorption. On the other hand, it is expected that the probability of absorption from a spectral distribution of total width [Gamma] should be proportional to [Gamma][sub [gamma]]/[Gamma], where [Gamma][sub [gamma]] is the radiation width of the absorbing nucleus. Generally [Gamma] is expected to be larger than [Gamma][sub [gamma]] because of the possibilities of internal conversion, transitions between magnetic sublevels, etc., all of which contribute to homogeneous broadening and should reduce the Moessbauer effect. The present Comment addresses questions of principle, mathematical assumptions, and other aspects of the work of Coussement [ital et] [ital al]. and demonstrates that a correct statistical treatment recovers the conventional more stringent requirement on the broadening. |
| Databáze: | OpenAIRE |
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