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Laser optogalvanic spectroscopy of moleculesIn laser optogalvanic (LOG) spectroscopy, a tunable laser is used to probe the spectral characteristics of atomic or molecular species within an electrical discharge in a low pressure gas. Optogalvanic signals arise when the impedance of the discharge changes in response to the absorption of laser radiation. The technique may, therefore, be referred to as impedance spectroscopy. This change in impedance may be monitored as a change in the voltage across the discharge tube. LOG spectra are recorded by scanning the wavelength of a chopped CW dye laser while monitoring the discharge voltage with a lock-in amplifier. LOG signals are obtained if the laser wavelength matches a transition in a species present in the discharge (or flame), and if the absorption of energy in the laser beam alters the impedance of the discharge. Infrared LOG spectroscopy of molecules has been demonstrated and may prove to be the most productive application in the field of optogalvanic techniques.
Document ID
19830055756
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Webster, C. R.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena CA, United States)
Rettner, C. T.
(Stanford University Stanford, CA, United States)
Date Acquired
August 11, 2013
Publication Date
February 1, 1983
Publication Information
ISSN: 0023-8589
Subject Category
Inorganic And Physical Chemistry
Accession Number
83A36974
Funding Number(s)
CONTRACT_GRANT: NSF CHE-80-06524
Distribution Limits
Public
Copyright
Other

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