Accession Number : ADP008247

Title :   Correlation Between the Relative Zero-Phonon Electronic Transition Probabilities (DEBYE-WALLER Factors) and the Matrix-Induced Spectral Shifts of Molecular Impurity Centers Doped into Amorphous Hosts,

Corporate Author : AKADEMIYA NAUK ESTONSKOI SSR TARTU

Personal Author(s) : Renge, Indrek

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : The attainable contrast in spectrally highly selective photochromic materials critically depends on the Debye-Waller factors (DWF). The search for better hole-burning systems requires simple criteria for the selection of suitable dopants and hosts on the basis of molecular structure and, preferably, of room-temperature spectroscopy. The accumulated experimental data allow to establish reasonable relationships between the DWF and the differences of intermolecular interaction parameters in the ground and excited state (dipole moments, polarizabilities). According to the Franck-Condon principle, the probability of exciting low-frequency intermolecular vibrations in the course of an electronic transition is higher when the minima of the intermolecular interaction potentials are displaced. Small DWF values are expected in the case of large differences between the van der Waals forces in the ground and excited state and vice versa.

Descriptors :   *PHOTOCHROMIC MATERIALS, *MOLECULAR SPECTROSCOPY, CONTRAST, DIPOLE MOMENTS, DIPOLES, ELECTRONICS, EXPERIMENTAL DATA, FREQUENCY, INTERACTIONS, LOW FREQUENCY, MATERIALS, MOLECULAR STRUCTURE, MOMENTS, PARAMETERS, PROBABILITY, ROOM TEMPERATURE, SELECTION, SPECTROSCOPY, STRUCTURES, TEMPERATURE, TRANSITIONS, VALUE, VANS, VIBRATION, PHONONS, DOPING, AMORPHOUS MATERIALS, MOLECULE MOLECULE INTERACTIONS.

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE