Relaxation Dynamics of Highly Excited Halogens in Their Electronic Ground States

Abstract

Highly excited vibrational levels of ground state iodine, and all levels of the metastable state, are involved in processes leading to the dissociation of I2 in the chemical oxygen iodine laser (COIL). Populations in these vibrationally and vibronically excited levels can be sensitively monitored by exciting laser induced fluorescence (LIF) from the valance to ion-pair transitions. However, accurate spectroscopic constants are required for the extraction of population distributions from spectral intensity data. Constants for the systems were obtained from rotationally resolved spectra for jet cooled, metastable I2. Studies of matrix isolated I2 and IBr were undertaken in order to examine their electronic relaxation dynamics in simple cryogenic solids, and to determine the A and A' state radiative decay rates. Large matrix shifts were observed, caused by solvation of the excited state dipole. It is probable that an optically pumped laser, operating on the D'-A' transition of Ar matrix isolated I2, could be constructed.

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Document Details

Document Type
Technical Report
Publication Date
Jan 21, 1992
Accession Number
ADA247312

Entities

People

  • Michael R Heaven

Organizations

  • Emory University

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Chemical Oxygen Iodine Lasers
  • Classification
  • Dissociation
  • Dye Lasers
  • Dynamics
  • Energy
  • Energy Levels
  • Energy Transfer
  • Excimer Lasers
  • Frequency Combs
  • Ground State
  • Laser Applications
  • Laser Beams
  • Laser Induced Fluorescence
  • Lasers
  • Metastable State
  • Spectroscopy

Fields of Study

  • Physics

Readers

  • Combustion science or combustion engineering.
  • Materials Science and Engineering.
  • Optical Physics and Photonics.

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers
  • Microelectronics