RAMAN-SCATTERING OF NEAT AND MIXED-CRYSTALS OF IRF6 - JAHN-TELLER INTERACTION IN THE GROUND-STATE

被引:12
作者
BERNSTEIN, ER
WEBB, JD
机构
[1] Department of Chemistry, Colorado State University, Fort Collins, CO
关键词
D O I
10.1080/00268977900100161
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Raman scattering data for neat and mixed crystal IrF6 samples at 77 K are reported. It is found that v2(eg) and v5(t2g) both evidence non-vanishing Jahn-Teller interactions for the T8g (4A2g) ground state. The linear Jahn-Teller parameters for these modes are D2≤ 0.001 and D5 = 0-02. The v5 Jahn-Teller interaction is large enough to quench an expected exciton splitting of ~ 20 cm-1 almost completely. The v2 Jahn-Teller interaction is small enough so that exciton interactions predominate; however, normal v2 k = 0 sharp line exciton structure is not observed. Anomalous phonon behaviour is observed and discussed with respect to other hexafluoride phonon data. The non-Jahn-Teller active modes v1 v3, v4, v6 are found to behave in a fashion consistent with other members of this series. © Taylor & Francis Group, LLC.
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页码:203 / 209
页数:7
相关论文
共 16 条
[1]   JAHN-TELLER EFFECT IN IRF6 - BAMMA-8G(T2G)3 STATE AT 6800-A [J].
BERNSTEIN, ER ;
WEBB, JD .
MOLECULAR PHYSICS, 1978, 35 (06) :1585-1607
[2]   INTERACTIONS IN INORGANIC MOLECULAR-CRYSTALS - ELECTRONIC-SPECTRA OF REF6 PURE AND MIXED CRYSTALS [J].
BERNSTEIN, ER ;
MEREDITH, GR .
JOURNAL OF CHEMICAL PHYSICS, 1976, 64 (01) :375-403
[3]   VIBRATIONAL-SPECTRA OF TRANSITION-METAL HEXAFLUORIDE CRYSTALS .3. EXCITON BAND STRUCTURES OF MOF6, WF6 AND UF6 [J].
BERNSTEIN, ER ;
MEREDITH, GR .
CHEMICAL PHYSICS, 1977, 24 (03) :311-325
[4]   VIBRATIONAL-SPECTRA OF TRANSITION-METAL HEXAFLUORIDE CRYSTALS .2. 2-PARTICLE AND MIXED-CRYSTAL SPECTRA AS TECHNIQUES FOR DETERMINATION OF DENSITIES OF STATES [J].
BERNSTEIN, ER ;
MEREDITH, GR .
CHEMICAL PHYSICS, 1977, 24 (03) :301-309
[5]   ABSORPTION AND ELECTRONIC RAMAN-SCATTERING SPECTRA OF THE GAMMA-8G(T2-1G) STATE OF IRF6 AT 1.6-MU - RESOLUTION OF THE JAHN-TELLER PROBLEM [J].
BERNSTEIN, ER ;
WEBB, JD .
MOLECULAR PHYSICS, 1979, 37 (01) :191-202
[6]   VIBRATIONAL-SPECTRA OF TRANSITION-METAL HEXAFLUORIDE CRYSTALS .1. ORTHORHOMBIC MOF6, WF6, AND UF6 NEAT CRYSTALS [J].
BERNSTEIN, ER ;
MEREDITH, GR .
CHEMICAL PHYSICS, 1977, 24 (03) :289-299
[7]  
BERNSTEIN ER, MOL PHYS
[9]   VIBRATIONAL-ELECTRONIC COUPLING IN IRF6, OSCL62- AND IRCL62- [J].
CHILD, MS .
MOLECULAR PHYSICS, 1960, 3 (06) :605-607
[10]  
CLAASSEN HH, 1969, ISRAEL J CHEM, V7, P499