โ Scribed by E.S. Medvedev; V.I. Osherov; V.M. Pschenichnikov
No coin nor oath required. For personal study only.
Theoretical analysis of the time-dependent triplet-triplet absorption spectrum of anrhracene is cvried out in terms of the Huanp-Rhys spectral function which describes the absorption of molecules thermally equilibrated, due to fast intramolecular processes, al some effective tempera!urc r*(r) depending on time because of the collisions with the buffer-gxs molecules. The close match between the theoretical spectra and the spectra observed by Porter et al. is demonstrated.
The investigation of time-dependent optical spectra is a straightfonvard ramification of the study of vibrational relaxation in molecules. Fonnosinho et al. [I ,2] were the first to carry out this kind of experiment on the excited states of large molecules. These authors have observed the timedependent spectra of the triplet-triplet absorption of anthracene using a pulsed laser for excitation of the anthracene molecules in the vapour phase at low Fressures. The results obtained have been interpreted in terms of two basic assumptions concerning the relaxation process: (1) the high rate of the intersystem crossing transition, and (2) localization of the excitation within a single vibrational level of the triplet state immediately after intersystem crossing. a single gaussian curve.
๐ SIMILAR VOLUMES
Wc deruonstrdte that the ulhfast rehation obxxvcd in the excited states oflargc org.mc molecules in solution m.~y bc understood 3s the collcrent evolution of the initlally prcparcd non-stationary state. It is shown that under fcmtosccond ewtt.tIion condtttons the relaxation is dctcrmincd by the chrx
The vibrational energy relaxation (VER) of polyatomic molecules has been the central issue in many of the chemical reactions in condensed phase [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] as well as in gas phase . The vibrational energy introduced to the molecule is immediately redis
The bleaching dynamics of organic dye molecules in solution have been investigated using 70 fs pulses from a colliding pulse mode-locked ring dye Laser. In addition to ground state relaxation on a nanosecond time scale, a fast partid recovery 1s observed. For the dyes Nile blue, oxazine 720, cresyl