✍ Scribed by V. Rusanov; V. Angelov; J. Angelova; Ts. Bonchev; Th. Woike; Hyung-sang Kim; S. Haussühl
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long-living electronic metastable configurations (SI and SII) can be generated in Na 2 NP single crystals by irradia-The Mo ¨ssbauer parameters isomer shift (IS), quadrupole splitting (QS), and probability of recoilless absorption f of 26 tion with light in the spectral range 350-580 nm at temperanitroprussides have been measured at room and liquid nitrogen tures below 200 K (SI) and 150 K (SII). The changes of temperatures. The values of the QS and the IS of the different structure and N-C-Fe-N-O bond distance at ground and compounds are close to each other, which is supposed to result electronically exited states have been directly measured from the same short-range environment of the Fe atom in by neutron diffraction (8). Population, depopulation, and the [Fe(CN) 5 NO] 2؊ ion. A weak correlation between IS and transition dynamics between the ground and two metastaelectronegativity of the lattice cation, as well as between QS ble states have been precisely studied as a function of the and CN trans stretching vibrations was found. For some of the intensity, wavelength, polarization, and duration of the investigated nitroprussides a Goldanskii-Karyagin effect was illuminating light (9). The electronic structure of both new observed. The Mo ¨ssbauer parameters IS and QS for two longmetastable states is investigated by means of Mo ¨ssbauer living electronic metastable configurations in some nitroprusspectroscopy (10). Such nearly infinitely long-living elecside single crystals are measured, too. Like in the case of ground tronic states can be generated in many nitrosylpentacyastate, these parameters are very close to each other, which shows that for the new metastable states the changes in the noferrates (11). electron density distribution of the [Fe(CN) 5 NO] 2؊ anion do Not less interesting is the observed difference between not practically depend on the kind of the metal cation. © 1996 the probabilities of recoilless resonance absorption f Ј and Academic Press, Inc. reemission f Љ of gamma-quanta in single crystals of Na 2 NP (12). The values of recoilless absorption f Ј and recoilless reemission after resonance absorption f Љ are commonly
📜 SIMILAR VOLUMES
In this letter a simple analytical method is described whereby the hyperfine parameters in Wossbauer iron spectroscopy may be determined directly from an observed spectrum in many cases of interest. After an initial assignment of the lines, a method is outlined in which the products of the eigenvalu