Tunable Diode Laser Optogalvanic Spectroscopy Of Molecules

Christopher R Webster; Robert T Menzies

doi:10.1117/12.937453

26 November 1983 Tunable Diode Laser Optogalvanic Spectroscopy Of Molecules

Christopher R Webster, Robert T Menzies

Proceedings Volume 0438, Tunable Diode Laser Development and Spectroscopy Applications; (1983) https://doi.org/10.1117/12.937453
Event: 27th Annual Technical Symposium, 1983, San Diego, United States

Abstract

The laser optogalvanic (LOG) technique for studying molecular spectra has been extended for the first time to the infrared wavelength region. Portions of the NH3 v2 band at 9.5 pm and the NO2 v3 band at 6.2 um have been recorded at Doppler-limited resolution using CW tunable diode lasers to probe DC electrical discharges in pure NH3 and an NO2/He gas mixture. Using adjustable electrode positions and an orthogonal geometry between the probe laser and the discharge axis, two contributions to the optogalvanic signal are identified: one which corresponds to an increase in discharge impedance and is seen only for irradiation of the negative glow region; and a second which corresponds to a decrease in discharge impedance and is seen for irradiation of all other discharge regions.

Citation Download Citation

Christopher R Webster and Robert T Menzies "Tunable Diode Laser Optogalvanic Spectroscopy Of Molecules", Proc. SPIE 0438, Tunable Diode Laser Development and Spectroscopy Applications, (26 November 1983); https://doi.org/10.1117/12.937453

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