OBSERVATION OF COUPLED AMPLITUDE MODES IN THE RAMAN-SPECTRUM OF INCOMMENSURATE NA2CO3
JOURNAL OF PHYSICS C-SOLID STATE PHYSICS 14:18 (1981) L509-L514
STRUCTURAL PHASE-TRANSITIONS IN K2CO3
JOURNAL OF PHYSICS C-SOLID STATE PHYSICS 14:11 (1981) 1611-1618
A piezospectroscopic study of deep levels in GaP:Co
Journal of Physics C: Solid State Physics 13:8 (1980)
Abstract:
The near-infrared photoluminescence spectrum of GaP:Co reveals a sharp line at 4506 cm-1 which is interpreted as an internal transition of the cobalt ion. Application of uniaxial stress causes a splitting of this line into a doublet. The magnitude of this splitting depends strongly on stress direction, and the relative intensities of the two components are polarisation dependent. The data are consistent with the impurity charge state Co2+ (d 7).Photoluminescence study of excitons in AgBr in high magnetic fields
Journal of Physics C: Solid State Physics 13:16 (1980) 3071-3086
Abstract:
The luminescence spectrum of AgBr at 1.6K reveals a number of sharp lines which are associated with excitons bound to residual impurities and crystalline defects. Two lines are identified as excitons bound to iodine ( epsilon b=43 meV) and cadmium ( epsilon b=8 meV). Several lines are observed in the neighbourhood of the phonon-assisted free-exciton emission, two of them corresponding to excitons bound to unidentified centres with energies of 1 meV and 0.25 meV. Electron-hole exchange coupling is found to be weak for excitons bound to the isoelectronic centres and their Zeeman spectra are described quite adequately by a simple L-S coupling scheme. The Zeeman spectra of the unidentified shallow states are found to be qualitatively similar to those of the isoelectronic traps. The g-values obtained decrease with increasing binding energy from ge=2.29 and gh=0.76 for the shallow states to ge=1.97 and gh=0.66 for the iodine trap.PHOTO-LUMINESCENCE STUDIES OF DEEP TRAPS IN GAP, FE
JOURNAL OF PHYSICS C-SOLID STATE PHYSICS 13:30 (1980) 5631-5643