The nuclear resonance absorption of the 67.03 keV de-excitation radiation of 73Ge*, Coulomb-excited by 20 to 30 MeV l80 ions, is studied. The recoiling 73Ge* nuclei are implanted into a chromium substrate. The electronic configurations Ge (4s' ps) in Ge (cryst.), Ge (15% (4s2 PO), 85% (4sa p2)) in Ge (II)Se, Ge (62% (4s0 PO). 38% (4s' p3)) in GeO, (hex.) and GeO, (tetr.), andthe ratio SR/R=1.12 x lO-sof the nuclear charge radius are compatible with the measured isomeric shifts. Line broadening6 and recoil-free fractions f of the implantation target and the absorbers are determined. A t 78 OK fGeO,(tetr.) is greater than fGeO,(hex.) by a factor of six.Die Kernresonanzabsorption der 67.03 keV y-Strahlung von 73Ge*, Coulomb-angeregt durch 180-Ionen von 20 bis 30 MeV, wurde untersucht. Die riickgestoBenen 73Ge*-Kerne wurden in eine Chromunterlage implantiert. Die Elektronenkonfigurationen Ge (4s1p3) in Ge (krist.), Ge (15% (48, PO), 86% (48, p2)) in Ge(II)Se, Ge (62% (4s0 PO), 38% (4s' p3)) in GeO, (hex.) und GeO, (tetr.) und 6R/R = 1,12 x 10-3 des Kernladungsradius sind mit den gemessenen Isomerieverschiebungen vertriiglich. Linienbreiten und Debye-Waller-Faktoren f des Implantationstargets und der Absorber wurden bestimmt. Bei 78" K ist faeO,(tetr.) urn den Faktor6 groBer als fGeo,(hex.).
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