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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Ed. by Weitzel, Karl-Michael

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Quantitative FM Spectroscopy at High Temperatures: The Detection of 1CH2 behind Shock Waves

G. Friedrichs / H.Gg. Wagner

Citation Information: Zeitschrift für Physikalische Chemie International journal of research in physical chemistry and chemical physics. Volume 214, Issue 12/2000, Pages 1723–, ISSN (Print) 0942-9352, DOI: 10.1524/zpch.2000.214.12.1723, September 2009

Publication History:
Published Online:
2009-09-25

The technique of time resolved frequency modulation (FM) spectroscopy has been shown to provide a very sensitive means to detect small radicals behind shock waves. Features of high temperature FM spectroscopy behind shock waves will be discussed and a general signal conversion procedure to carry out quantitative concentration measurements will be presented.

Using a high modulation frequency, a high modulation index and high total optical power, singlet methylene radicals (1CH2) have been detected behind shock waves for the first time. For a pressure of 1 bar the narrow bandwidth absorption coefficient of 1CH2 at 590.707 nm (b1B1(0,14,0)404 ← ã1A1(0,0,0)414) was determined in the temperature range 1900-2800 K to be:

αc /(cm2 mol-1) = -6.16 × 105 + ((2.597 × 109) : (T/K)) - ((1.181 × 1012) : (T/K)2).

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