Absolute spectroscopy of N2O near 4.5 μm with a comb-calibrated, frequency-swept quantum cascade laser spectrometer

We present absolute line center frequencies for 24 fundamental ν3 ro-vibrational P-branch transitions near 4.5 μm in N2O with an absolute expanded (multiplied by 2) frequency uncertainty of 800 kHz. The spectra are acquired with a swept laser spectrometer consisting of an external-cavity quantum cas...

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Bibliographic Details
Published inOptics express Vol. 21; no. 1; pp. 1020 - 1029
Main Authors Knabe, Kevin, Williams, Paul A, Giorgetta, Fabrizio R, Radunsky, Michael B, Armacost, Chris M, Crivello, Sam, Newbury, Nathan R
Format Journal Article
LanguageEnglish
Published United States 14.01.2013
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Summary:We present absolute line center frequencies for 24 fundamental ν3 ro-vibrational P-branch transitions near 4.5 μm in N2O with an absolute expanded (multiplied by 2) frequency uncertainty of 800 kHz. The spectra are acquired with a swept laser spectrometer consisting of an external-cavity quantum cascade laser whose instantaneous frequency is continuously tracked against a near-infrared frequency comb. The measured absorbance profiles have a well-calibrated frequency axis, and are fitted to determine absolute line center values. We discuss the main sources of uncertainty.
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ISSN:1094-4087
DOI:10.1364/OE.21.001020