Multiphoton gas phase spectroscopy. Final report

Technical Report · Mon Jun 08 04:00:00 EDT 1981

OSTI ID:5433970

Wessel, J E

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.

• Research Organization: University of Southern California, Los Angeles (USA)
• OSTI ID: 5433970
• Report Number(s): AD-A-107671/0
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104* -- Spectral Procedures-- (-1987)
AROMATICS
CHROMATOGRAPHY
CONDENSED AROMATICS
DETECTION
ELEMENTARY PARTICLES
ELEMENTS
GAS CHROMATOGRAPHY
HALOGENS
HYDROCARBONS
IODINE
IONIZATION
LASER SPECTROSCOPY
MASSLESS PARTICLES
MOLECULES
NAPHTHALENE
NONMETALS
ORGANIC COMPOUNDS
PHOTOIONIZATION
PHOTONS
SEPARATION PROCESSES
SPECTROSCOPY