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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Ed. by Rademann, Klaus

IMPACT FACTOR 2015: 1.183

SCImago Journal Rank (SJR) 2015: 0.491
Source Normalized Impact per Paper (SNIP) 2015: 0.520
Impact per Publication (IPP) 2015: 1.133

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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. Volume 214, Issue 12/2000, Pages 1723–, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1524/zpch.2000.214.12.1723, September 2009

Publication History

Published Online:

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).

Citing Articles

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J. Dammeier, B. Oden, and G. Friedrichs
International Journal of Chemical Kinetics, 2013, Volume 45, Number 1, Page 30
Gernot Friedrichs, David F. Davidson, and Ronald K. Hanson
International Journal of Chemical Kinetics, 2004, Volume 36, Number 3, Page 157
J. Deppe and H.Gg. Wagner
Zeitschrift für Physikalische Chemie, 2001, Volume 215, Number 12/2001

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