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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Editor-in-Chief: Rademann, Klaus

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Volume 229, Issue 10-12


Collisional Relaxation of NCN: An Experimental Study with Laser-Induced Fluorescence

Jens Hetzler
  • Institut für Physikalische Chemie, Karlsruher Institut für Technologie (KIT), Kaiserstr. 12, 76131 Karlsruhe, Germany
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/ Matthias Olzmann
  • Corresponding author
  • Institut für Physikalische Chemie, Karlsruher Institut für Technologie (KIT), Kaiserstr. 12, 76131 Karlsruhe, Germany
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Published Online: 2015-10-02 | DOI: https://doi.org/10.1515/zpch-2015-0673


Collisional relaxation of NCN produced by photolysis of NCN3 at a wavelength of 248 nm has been investigated with laser-induced fluorescence (LIF) in a temperature range of 240–293 K and a pressure range of 10–800 mbar with different bath gases (He, Ne, Ar, Kr, H2, N2, O2, and N2O). LIF excitation spectra were recorded, and LIF intensity-time profiles experimentally obtained at an excitation wavelength of 329.01 nm have been fitted with biexponential functions. The pressure and bath gas dependence of the rate coefficients obtained was rationalized in terms of a simple Landau–Teller/Schwartz–Slawsky–Herzfeld model, and notable influences of vibrational energy transfer to the rate of the overall relaxation process have been found. Evidence was obtained for a two-channel vibrational relaxation in NCN.

This article offers supplementary material which is provided at the end of the article.

Keywords: Collision-Induced Intersystem Crossing; Vibrational Relaxation; Laser-Induced Fluorescence; Cyanonitrene Radical

Supplementary material

the online version of this article (DOI: 10.1515/zpch-2015-0673) provides supplementary material for authorized users.


Financial support by the Deutsche Forschungsgemeinschaft (SFB 606 “Non-stationary Combustion: Transport Phenomena, Chemical Reactions, Technical Systems”) is gratefully acknowledged. The authors thank Professor Gus Hancock for helpful discussions.

About the article

Accepted: 2015-08-31

Received: 2015-07-31

Published Online: 2015-10-02

Published in Print: 2015-10-28

Citation Information: Zeitschrift für Physikalische Chemie, Volume 229, Issue 10-12, Pages 1503–1519, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1515/zpch-2015-0673.

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