Multiphoton Gas Phase Spectroscopy.
Abstract
Multiphoton laser spectroscopy has been investigated as a potential method to improve optical detection for large molecular species. Studies were conducted to establish the photophysics and spectroscopy relevant to molecular detection by multiphoton processes. Detection procedures were optimized on the basis of information derived from the spectroscopic investigations. Detection limits of less than 10 to the 5th power molecules/cubic centimeters were established for naphthalene, a representative aromatic species. This is a one-thousandfold improvement with respect to the most sensitive prior techniques. The new method was applied to gas chromatography, for which spectrally selective detection was demonstrated. In addition a new method of ultrahigh resolution two-wavelength multiphoton photoionization spectroscopy was proposed, and a preliminary demonstration was made for the iodine molecule. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 08, 1981
- Accession Number
- ADA107671
Entities
People
- John E. Wessel
Organizations
- University of Southern California