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Magnetic Field Effect on the Vibronic Structure of a 4 T 2 Level of a d 5 Ion Coupled to ε‐Vibrational Modes
Author(s) -
Parrot R.,
Boulanger D.,
Pohl U. W.,
Litzenburger B.,
Gumlich H. E.
Publication year - 1998
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199807)208:1<113::aid-pssb113>3.0.co;2-e
Subject(s) - zeeman effect , vibronic spectroscopy , chemistry , atomic physics , spectroscopy , magnetic dipole transition , excitation , spectral line , hamiltonian (control theory) , vibronic coupling , ion , dipole , magnetic field , magnetic dipole , electric dipole transition , excited state , physics , mathematical optimization , mathematics , quantum mechanics , organic chemistry , astronomy
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 σ + and σ −; of the two observed FVLs corresponding to transitions 6 A 1 → 4 T 2 have been obtained by using polarization‐modulated laser spectroscopy performed at 1.9 K, for B ∥ [001] and B → [111]. Second, the theoretical energies and relative dipole strengths (RDS) of the transitions between the Zeeman levels 6 A 1 ( M S = —5/2 to M iiS = +5/2) of the fundamental level and the Zeeman levels of the Kramers doublets Γ 6 ( 4 T 2 ), Γ 7 ( 4 T 2 ), and spin quartets Γ' 8 (3/2) ( 4 {T 2 ), Γ' 8 (5/2) ( 4 {T 2 ), have been analyzed in terms of the Zeeman Hamiltonian μ B g e S · 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 ε‐vibrational modes must be rejected and that, for the proposed model, the two observed lines are associated to transitions | 6 A 1 〉 → |Γ' 8 (5/2) ( 4 T 2 )〉 and | 6 A 1 〉 → |Γ 6 ( 4 T 2 )〉, the transition | 6 A 1 〉 → |Γ' 8 (3/2) ( 4 T 2 )〉 being strongly attenuated by selective intensity transfer due to a medium coupling to ε‐vibrational modes, and the transition | 6 A 1 〉 → |Γ 7 ( 4 T 2 )〉 being forbidden by symmetry.