NDLI: Cavity enhanced absorption spectroscopy measurements of pressure-induced broadening and shift coefficients in the υ 1+υ 3 combination band of ammonia

Content Provider	Springer Nature Link
Author	Bell, C. L. Ritchie, G. A. D. Helden, J. H. Hancock, G. Dhib, M. Leeuwen, N. J.
Copyright Year	2008
Abstract	Cavity enhanced absorption spectroscopy is performed using an external cavity diode laser operating around 1516 nm. We demonstrate a sensitivity of 6×10−8 cm−1 Hz−1/2 and utilise a simple method to measure pressure-induced broadening and shift coefficients. The broadening and shift coefficients for six gases (helium, neon, argon, xenon, oxygen and nitrogen) have been determined at room temperature for four transitions in the υ 1+υ 3 combination band of ammonia. Comparisons of the broadening coefficients with previous work in this region, where it exists, show good agreement. The broadening and shift coefficients of nitrogen and oxygen are also in good agreement with calculated values using the Robert and Bonamy theory. Both the broadening and shift coefficients show a clear trend through the rare gases, which can be explained in terms of the varying magnitude of the long range attractive forces operating between the colliding partners. We also demonstrate the application of the Parmenter–Seaver formalism to estimate the potential well depth of the ammonia dimer from the obtained broadening coefficients. The obtained well depth agrees well with theoretical calculations.
Ending Page	336
Page Count	10
Starting Page	327
File Format	PDF
ISSN	09462171
e-ISSN	14320649
Journal	Applied Physics B
Issue Number	2
Volume Number	94
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-10-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Engineering Optical Spectroscopy, Ultrafast Optics Laser Technology and Physics, Photonics Physical Chemistry Electromagnetism, Optics and Lasers Quantum Optics, Quantum Electronics, Nonlinear Optics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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