title: Absolute spectroscopy of N2O near 4.5 μm with a comb-calibrated, frequency-swept quantum cascade laser spectrometer.
abstract: 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.
authors: National Institute of Standards and Technology, Boulder, Colorado 80305, USA.
authors: Kevin
authors: K
authors: Knabe
authors: Paul A
authors: PA
authors: Williams
authors: Fabrizio R
authors: FR
authors: Giorgetta
authors: Michael B
authors: MB
authors: Radunsky
authors: Chris M
authors: CM
authors: Armacost
authors: Sam
authors: S
authors: Crivello
authors: Nathan R
authors: NR
authors: Newbury