Accession Number : ADP008266

Title :   A New Type Photon-Gated Photochemical Hole Burning by Two-Color-Sensitized Photoreaction,

Corporate Author : TOKYO UNIV (JAPAN)

Personal Author(s) : Horie, Kazuyuki ; Machida, Shinjiro ; Yamashita, Takashi

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : Photochemical Hole Burning (PHB) has attracted considerable interest not only as a tool for high resolution spectroscopy of amorphous solid at low temperature but also as a possible means for frequency-domain high-density optical storage. Many recent investigations have been devoted to a photon-gated mechanism because it allows nondestructive readout in utilizing PHB for a practical optical memory system. The mechanisms of previously reported photon-gated PHB systems are two-step photoionization, photodecomposition, and photoinduced donor-acceptor electron transfer reactions. In this presentation, we report the first observation to our knowledge of a new mechanism for photon-gated PHB: two color photosensitization of the photoreactive matrix polymer that involves triplet-triplet energy transfer process from higher excited triplet state of sensitizer to photoreactive energy acceptor groups. The present system consists of a zinc 9,18,27,36-tetra(4-tolyl)-tetrabenzoporphine (ZnTTBP), and a glycidyl azide polymer (GAP) cross-linked with trimethylol propane and isophorone diisocyanate.

Descriptors :   *MOLECULAR SPECTROSCOPY, *PHOTOCHEMICAL REACTIONS, AZIDES, DENSITY, ELECTRON TRANSFER, ELECTRONS, ENERGY TRANSFER, FREQUENCY, FREQUENCY DOMAIN, HIGH DENSITY, HIGH RESOLUTION, LOW TEMPERATURE, PHOTODECOMPOSITION, PHOTOIONIZATION, PHOTONS, POLYMERS, PROPANE, RESOLUTION, SOLIDS, SPECTROSCOPY, TEMPERATURE, ZINC, AMORPHOUS MATERIALS.

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE