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Author Romann, Albert ♦ Sigrist, Markus W.
Source J-STAGE
Content type Text
Publisher The Japan Society for Analytical Chemistry
Language English
Abstract High resolution spectral data of 100 ppmV $(10^{-6}$ per volume) concentrations of the trace gases bromo methane (BM, $CH_{3}Br),$ and methyl bromide (DME, $(CH_{3})_{2}O),$ buffered in synthetic air (80% $N_{2},$ 20% $O_{2})$ at atmospheric pressure and room temperature are reported. The spectra are recorded with a continuously tunable 10-bar $CO_{2}$ laser based photoacoustic (PA) spectrometer. The tuning range covers 76 $cm^{-1}$ between 9.2 μm (1087 $cm^{-1})$ and 10.7 μm (935 $cm^{-1})$ at a constant narrow line-width of 0.018 $cm^{-1}$ (540 MHz). The non-resonant PA measuring cell employs an in-line 10-microphone array. The estimated detection limits for BM and DME are approximately 2 ppmV for a signal-to-noise ratio (SNR) of 3. This corresponds to a calculated detection limit of∼76 ppbV for ethylene.
ISSN 09106340
Learning Resource Type Article
Publisher Date 2001-01-01
e-ISSN 13482246
Journal Analytical Sciences(analsci)
Volume Number 17
Issue Number 12
Page Count 3
Starting Page 1441
Ending Page 1443


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