ISSN:
1434-6036
Schlagwort(e):
71.70Ej
;
78.50Ge
;
78.55Et
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract Optical spectra of thed 4 configuration have been studied with II–VI compounds. Failure of static crystal-field description led various authors to introduce static or dynamic Jahn-Teller models for the Cr2+ ground and excited states. With ZnS, the main optical transition5 E(D)↔5 T 2(D) now appears as a doublet at 5218 and 5212 cm−1 coinciding for emission and absorption spectra. This no-phonon structure indicates a splitting of the gound-and excited-state multiplets under combined Jahn-Teller and spin-orbit interactions. In the cubic host ZnSe and in the hexagonal compounds CdS and CdSe, the optical properties exhibit the same general behaviour but with a decreasing shaping of the structural details. In addition to the NIR measurements, middle-infrared spectra have been recorded by Fourier spectroscopy in the transmission mode. For the first time a broad band could be detected for ZnS and interpreted as the $$^5 \hat E\left( {T_2 } \right) \leftarrow ^5 \hat B\left( {T_2 } \right)$$ absorption between the sheets of the respective adiabatic potential surfaces inD 2d symmetry. Its maximum near 1300 cm−1 indicates $$\bar v_{JT} \approx 430cm^{ - 1} $$ cm−1 following the common interpretation of this transition.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01316820
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