Abstract

When studying small molecular ions in a gas discharge, one has to deal with the problem of neutral species that exist in much larger number. Frequently, the spectrum of the ion is completely hidden behind the spectrum of the neutral. In 1982 Gudeman and Saykally developed the technique of velocity modulation spectroscopy, a method that allows for an almost complete suppression of spectra originating from neutrals.

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Large-modulation-depth 2f spectroscopy with diode lasers for rapid temperature and species measurements in gases with blended and broadened spectra

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Line shifts due to blending*

A. T. Young
J. Opt. Soc. Am. 68(2) 246-250 (1978)

Enhancement of trace gas detection by integrating wavelength modulated spectra across multiple lines

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