SPIN POLARIZATION AND SPIN-LATTICE RELAXATION IN THE LOWEST TRIPLET STATE OF PYRAZINE AT 1.6 DEGREES K

Abstract

The different mechanisms proposed for the spin-lattice relaxation process of a paramagnetic impurity in ionic crystals are briefly summarized. The decay characteristics of the pyrazine phosphorescence in cyclohexane and benzene matrices at 1.6K and its temperature dependence can best be explained if competition between the spin-lattice relaxation process between the triplet sublevels and the radiative process from one of the sublevels of pyrazine is invoked. A scheme is found to explain the observed temperature effects on the decay characteristics as well as the unique phosphorescence polarization along the N...N axis of the pyrazine molecule. The effect of the magnetic field on the decay curve is demonstrated, and briefly described.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1968
Accession Number
AD0679192

Entities

People

  • Andrew Armstrong
  • L. Hall
  • Mostafa El-Sayed
  • W. R. Moomaw

Organizations

  • University of California, Los Angeles

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Absorption
  • Chemistry
  • Competition
  • Crossings
  • Crystals
  • Cyclic Hydrocarbons
  • Electrons
  • Emission
  • Ground State
  • Internal Conversion
  • Ionic Crystals
  • Low Temperature
  • Magnetic Fields
  • Polarization
  • Quantum Yields
  • Radiation
  • Relaxation Time

Readers

  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.
  • Theoretical Analysis.