Abstract
The temperature dependence of the hyperfine splitting of the 8.42 keVγ-ray of Tm169 in oxide crystals was investigated using the Mößbauer-effect. The quadrupole splitting of the first excited state in Tm169 showed a pronounced increase with decreasing temperature. This manifests a contribution of various Stark levels, which are occupied according to their Boltzmann factors, to an average field gradient at the nucleus. It is shown in a model calculation for the temperature dependence of the field gradient that the data can be explained using a maximum splitting of about 400 cm−1 of the electronic groundstate by the crystal field.
The emission pattern of the Er2O3-source is broadened below 20° K. This is possibly produced by an interaction with a residual magnetic field from the surrounding Er-ions.
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Für das stetige Interesse und die Förderung der Arbeit danken wir Herrn Professor H.Maier-Leibnitz herzlich.
Herrn Professor W.Meissner möchten wir für die freundliche Bereitstellung der Tieftemperatureinrichtungen danken. Herr H.Berndt half uns mit vielen experimentellen Ratschlägen, Herrn H.Fleischmann verdanken wir einige Diskussionen. Den Temperofen stellte uns Herr Dr. W.Schilling zur Verfügung. Ihnen, sowie Frau Dr. U.Zahn für die Hilfe bei der Verarbeitung des aktiven Präparates, sei ebenso vielmals gedankt.
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Kalvius, M., Wiedemann, W., Koch, R. et al. Hyperfeinstrukturaufspaltung von rückstoßfreien Gammalinien. Z. Physik 170, 267–273 (1962). https://doi.org/10.1007/BF01378467
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DOI: https://doi.org/10.1007/BF01378467