Universität zu Köln

Assaf, Emmanuel ORCID: 0000-0002-1549-5988, Asvany, Oskar, Votava, Ondrej, Batut, Sebastien, Schoemaecker, Coralie ORCID: 0000-0001-7016-9432 and Fittschen, Christa ORCID: 0000-0003-0932-432X (2017). Measurement of line strengths in the (A)over-tilde (2)A' <- (X)over-tilde2A '' transition of HO2 and DO2. J. Quant. Spectrosc. Radiat. Transf., 201. S. 161 - 171. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1879-1352

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Abstract

The absorption spectrum of the (A) over tilde (2)A' <- (x) over tilde (2)A '' 000-000 band of HO2 and DO2 radicals has been measured in the range 6941-7077cm(-1) with a resolution of around 0.005 cm(-1). HO2 and DO2 radicals were generated from the reaction of Cl-atoms with CH3OH and CD3OD, respectively, whereby Cl-atoms were generated by pulsed photolysis of (COCl)(2) at 248 nm. One time-resolved absorption curve was measured by cw-Cavity Ring Down Spectroscopy (cw-CRDS) for each wavelength. The relative absorption coefficient for each wavelength was then obtained from the ring down time tau, extrapolated to t=0 s with respect to the photolysis pulse, and the ring down time tau(0) before the photolysis pulse. Absolute absorption coefficients were quantified for several selected lines relative to a well characterized absorption line of HO2 at 6638.21 cm(-1) by a second cw-CRDS absorption path. The maximum absorption cross section at 50 Torr Helium was for HO2 the transition N K-a K-c J=11 0 11 11.5 <- 11 1 11 11.5 with sigma(7000.28) cm(-1) = 2.12 x 10(-19) cm(2) and for DO2 the doublet transition N K-a K-c J=18 1 18 18.5 <- 18 0 18 18.5 and 18 1 18 17.5 <- 18 0 18 17.5 with sigma(7019.83) cm(-1)= 2.97 x 10(-19) cm(2). The full spectrum has been very well reproduced by employing spectroscopic data from earlier works. (C) 2017 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Assaf, Emmanuel UNSPECIFIED orcid.org/0000-0002-1549-5988 UNSPECIFIED Asvany, Oskar UNSPECIFIED UNSPECIFIED UNSPECIFIED Votava, Ondrej UNSPECIFIED UNSPECIFIED UNSPECIFIED Batut, Sebastien UNSPECIFIED UNSPECIFIED UNSPECIFIED Schoemaecker, Coralie UNSPECIFIED orcid.org/0000-0001-7016-9432 UNSPECIFIED Fittschen, Christa UNSPECIFIED orcid.org/0000-0003-0932-432X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-213181
DOI:	10.1016/j.jqsrt.2017.07.004
Journal or Publication Title:	J. Quant. Spectrosc. Radiat. Transf.
Volume:	201
Page Range:	S. 161 - 171
Date:	2017
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	1879-1352
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HIGH-RESOLUTION; SELF-REACTION; ABSORPTION-SPECTRUM; KINETICS; RADICALS; SPECTROSCOPY; DEPENDENCE; BAND; PHOTOLYSIS; RANGE Multiple languages Optics; Spectroscopy Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/21318