Accession Number : ADP008287

Title :   Elucidation of Photophysics and Photochemistry in Polyacene Photoadducts,

Corporate Author : CALIFORNIA UNIV RIVERSIDE DEPT OF CHEMISTRY

Personal Author(s) : Iannone, Mark A. ; Scott, Gary W.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : Recently we have reported studies of low-temperature spectroscopy of a series of polyacene photoadducts. A principal technique has been that of photochemical hole burning at l.5K. The photochemistry involves the photodecomposition of the adduct back to the constituent polyacenes. In the present paper we extend this work on the photophysics and photochemistry of AT and also report new results on BrAT. For AT, photodecomposition occurs in S1 over a relatively high barrier, typically at temperatures >200K or at high excess excitation energies (lambda < 280 nm). Decomposition may also occur from upper triplet or singlet states, well-above the energies of the lowest excited states in these manifolds.

Descriptors :   *PHOTOCHEMICAL REACTIONS, *POLYMERS, BARRIERS, DECOMPOSITION, EXCITATION, LOW TEMPERATURE, PHOTODECOMPOSITION, SPECTROSCOPY, TEMPERATURE, WORK, PHOTONS, ABSORPTION, ELECTRONIC STATES, MOLECULAR SPECTROSCOPY.

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Polymer Chemistry
      Radiation and Nuclear Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE