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The cavity-enhanced absorption spectrum of NH3 in the near-infrared region between 6850 and 7000 cm−1

✍ Scribed by D.M. O’Leary; J. Orphal; A.A. Ruth; U. Heitmann; P. Chelin; C.E. Fellows

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
350 KB
Volume
109
Category
Article
ISSN
0022-4073

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✦ Synopsis

In this paper, we describe new high-resolution measurements of the absorption spectrum of 14 NH 3 in the 6850-7000 cm À1 region using cavity-enhanced absorption spectroscopy (CEAS), and Fourier-transform spectroscopy (FTS) between $6400 and 6900 cm À1 . The CEAS measurements were used to determine line positions, line intensities (cross-sections) and pressurebroadening parameters, the latter in three different bath gases. A total of 1117 NH 3 lines were observed. The accuracy of the line positions is about 0.001 cm À1 , and absorptions cross-sections as low as 1 Â 10 À23 cm 2 molecule À1 are reported.

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