Home
For authors
Submission status

Current
Archive
Archive (English)
   Volumes 21-40
   Volumes 1-20
   Volumes 41-62
      Volume 62
      Volume 61
      Volume 60
      Volume 59
      Volume 58
      Volume 57
      Volume 56
      Volume 55
      Volume 54
      Volume 53
      Volume 52
      Volume 51
      Volume 50
      Volume 49
      Volume 48
      Volume 47
      Volume 46
      Volume 45
      Volume 44
      Volume 43
      Volume 42
      Volume 41
Search
VOLUME 58 (1993) | ISSUE 11 | PAGE 874
Destruction of the vibrational structure of the band of instantaneous fluorescence spectra of polar solutions with increasing delay time
The evolution of the instantaneous flurorescence spectra of polar compounds in alcohols has been studied at delay times t greater than the average lifetime in the excited state by a factor of 5, 6, or more. As t is increased, one observes a destruction of the vibrational structure, a coalescence of the less intense vibrational bands, and a compression of the spectrum. This compression then gives way to an expansion, and the structure is partially restored. It is suggested that the effects observed stem from nonadiabatic random perturbations of an excited molecule which result from an abrupt reorientation of the molecules of the medium and their polar fragments (OH groups) and from a reorientation of the fragments of the compounds themselves. Such perturbations modulate the phase and amplitude of the radiation and also alter the frequency, leading to a spectral "borrowing" and a redistribution of intensity in the electronic-vibrational emission spectrum.