Infrared-Terahertz Double-Resonance Spectroscopy of CH3F and CH3Cl at Atmospheric Pressure

Abstract

A method for highly selective remote sensing of atmospheric trace polar molecular gases is described. Based on infrared-terahertz double-resonance spectroscopic techniques, the molecule-specific coincidence between the lines of a CO2 laser and rotational-vibrational molecular absorption transitions provide two dimensions of recognition specificity: infrared coincidence frequency and the corresponding terahertz frequency whose absorption strength is modulated by the laser.Atmospheric pressure broadening expands the molecular recognition specificity matrix by simultaneously relaxing the infrared coincidence requirement and strengthening the corresponding terahertz signature. Representative double-resonance spectra are calculated for prototypical molecules CH3F and CH3Cl and their principal isotopomers from which a heuristic model is developed to estimate the specificity matrix and double-resonance signature strength for any polar molecule.

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Document Details

Document Type
Technical Report
Publication Date
May 16, 2012
Accession Number
ADA597047

Entities

People

  • Dane J. Phillips
  • Elizabeth A. Tanner
  • Frank C. De Lucia
  • Henry O. Everitt

Organizations

  • Ohio State University

Tags

Communities of Interest

  • Advanced Electronics
  • Sensors

DTIC Thesaurus Topics

  • Absorption Coefficients
  • Barometric Pressure
  • Carbon Dioxide Lasers
  • Coefficients
  • Dipole Moments
  • Energy Levels
  • Far Infrared Lasers
  • Frequency
  • Infrared Lasers
  • Lasers
  • New York
  • Quantum Numbers
  • Remote Sensing
  • Spectra
  • Spectroscopy
  • Terahertz Radiation
  • Trace Gases

Fields of Study

  • Physics

Readers

  • Optical Physics and Photonics.
  • Quantum Chemistry
  • Space/Atmospheric Physics.

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers