Accession Number : ADP008295

Title :   Hole Burning in Long Chain Molecular Aggregates,

Corporate Author : MAINZ UNIV (GERMANY F R)

Personal Author(s) : Hirschmann, R. ; Friedrich, J.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : The salts of pseudoisocyanine (PIC) have very specific optical properties. Under certain conditions (concentration, temperature) the PIC-molecules form linear aggregates in solution. Since the coupling between the molecules comprising the aggregate is very strong, the excited states are delocalized over a large range. A coherence length on the order of 1000 A is not uncommon. These excitonic states carry momentum and, hence, the physics of these systems shows novel phenomena as compared to small probe systems. Such phenomena are, for instance, extreme motional narrowing of inhomogeneous line broadening and a very specific temperature dependence of the homogeneous width due to exciton-phonon-scattering processes in which both, energy as well as momentum, have to be conserved.

Descriptors :   *MOLECULES, COHERENCE, COUPLINGS, ENERGY, EXCITONS, LENGTH, MOMENTUM, OPTICAL PROPERTIES, PHONONS, PHYSICS, PROBES, SALTS, SCATTERING, TEMPERATURE, WIDTH, MOLECULAR STRUCTURE, LONG RANGE(DISTANCE), MOLECULAR SPECTROSCOPY, ABSORPTION.

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Optics
      Organic Chemistry
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE