Magnetic Field Effect on the Vibronic Structure of a 4T2 Level of a d5 Ion Coupled to ε-Vibrational Modes

✍ Scribed by R. Parrot; D. Boulanger; U. W. Pohl; B. Litzenburger; H. E. Gumlich

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 310 KB
• Volume: 208
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/(sici)1521-3951(199807)208:1<113::aid-pssb113>3.0.co;2-e

✦ Synopsis

A high resolution study of the magnetic field effect on the fundamental vibronic lines (FVL) of the 4 T 2 level at lower energy of Mn 2 in pure cubic ZnS has been made in order to analyze the vibronic structure of this level. First, very detailed excitation spectra s and s À of the two observed FVLs corresponding to transitions 6 A 1 3 4 T 2 have been obtained by using polarizationmodulated laser spectroscopy performed at 1.9 K, for B k 001 and B k 111. Second, the theoretical energies and relative dipole strengths (RDS) of the transitions between the Zeeman levels 6 A 1 (M S À5a2 to M S 5a2) of the fundamental level and the Zeeman levels of the Kramers doublets G 6 4 T 2 Y G 7 4 T 2 , and spin quartets G H 8 3a2 4 T 2 , G H 8 5a2 4 T 2 , have been analyzed in terms of the Zeeman Hamiltonian m B g e S Á H and in terms of three coefficients which account for the splitting and RDS of the fundamental vibronic lines in zero magnetic field. Finally, by comparing the theoretical and experimental spectra, it is shown that the model of a strong coupling to e-vibrational modes must be rejected and that, for the proposed model, the two observed lines are associated to transitions j 6 A 1 i 3 jG H 8 5a2 4 T 2 i and j 6 A 1 i 3 jG 6 4 T 2 i, the transition j 6 A 1 i 3 jG H 8 3a2 4 T 2 i being strongly attenuated by selective intensity transfer due to a medium coupling to e-vibrational modes, and the transition j 6 A 1 i 3 jG 7 4 T 2 i being forbidden by symmetry.