Simultaneous laser-induced fluorescence and sub-Doppler polarization spectroscopy of the CH radical

Johannes Kiefer, Zhongshan Li, Johan Zetterberg, Martin Linvin, Marcus Alden

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The first application of polarization spectroscopy (PS) to the CH radical is demonstrated. In particular, we report on the simultaneous application of laser-induced fluorescence (LIF) and sub-Doppler PS to CH. The conventional experimental setup for PS was supplemented with a second detection system in order to collect the LIF emission. At the same time a Fabry-Perot etalon and molecular iodine were utilized to obtain a precise relative and absolute frequency scale, respectively. CH was investigated in a low pressure methane-oxygen flame. The R(2)(5) transition of the B-X (0, 0) band corresponding to a wavelength around 387.3 nm was scanned while fluorescence emission was collected in the spectral region around 431 nm from the B-X (0, 1), A-X (1, 1) and A-X (0, 0) bands. The saturation behavior of both techniques is investigated as well as line broadening effects due to the pump laser pulse energy or rather fluence. Saturation fluence for LIF was found to be more than one order of magnitude higher as compared to PS. (c) 2006 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)347-352
Number of pages6
JournalOptics Communications
Volume270
Issue number2
Early online date28 Sep 2006
DOIs
Publication statusPublished - 15 Feb 2007

Fingerprint

laser induced fluorescence
Fluorescence
Spectroscopy
methylidyne
Polarization
Lasers
polarization
spectroscopy
fluence
saturation
Methane
Iodine
iodine
flames
Laser pulses
methane
low pressure
Pumps
pumps
Oxygen

Keywords

  • high resolution spectroscopy
  • laser-induced fluorescence
  • polarization spectroscopy
  • CH radical

Cite this

Simultaneous laser-induced fluorescence and sub-Doppler polarization spectroscopy of the CH radical. / Kiefer, Johannes; Li, Zhongshan; Zetterberg, Johan; Linvin, Martin; Alden, Marcus.

In: Optics Communications, Vol. 270, No. 2, 15.02.2007, p. 347-352.

Research output: Contribution to journalArticle

Kiefer, Johannes ; Li, Zhongshan ; Zetterberg, Johan ; Linvin, Martin ; Alden, Marcus. / Simultaneous laser-induced fluorescence and sub-Doppler polarization spectroscopy of the CH radical. In: Optics Communications. 2007 ; Vol. 270, No. 2. pp. 347-352.
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AB - The first application of polarization spectroscopy (PS) to the CH radical is demonstrated. In particular, we report on the simultaneous application of laser-induced fluorescence (LIF) and sub-Doppler PS to CH. The conventional experimental setup for PS was supplemented with a second detection system in order to collect the LIF emission. At the same time a Fabry-Perot etalon and molecular iodine were utilized to obtain a precise relative and absolute frequency scale, respectively. CH was investigated in a low pressure methane-oxygen flame. The R(2)(5) transition of the B-X (0, 0) band corresponding to a wavelength around 387.3 nm was scanned while fluorescence emission was collected in the spectral region around 431 nm from the B-X (0, 1), A-X (1, 1) and A-X (0, 0) bands. The saturation behavior of both techniques is investigated as well as line broadening effects due to the pump laser pulse energy or rather fluence. Saturation fluence for LIF was found to be more than one order of magnitude higher as compared to PS. (c) 2006 Elsevier B.V. All rights reserved.

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