The absorption spectrum of nitrous oxide between 8325 and 8622 cm−1

An improved analysis of the N2O absorption spectrum in the 1.18 µm window

“…The spectra were recorded with the same setup as used in Ref. [1]. An external cavity diode laser (ECDL) was used to cover the 8321-8620 cm -1 spectral region.…”

“…The analysis of the nitrous oxide room temperature spectra recorded at a pressure of 1 Torr using high sensitivity cavity ring down spectroscopy (CRDS) has been recently reported between 8325 and 8622 cm -1 [1]. A total of 3305 lines belonging to 47 bands of the 14 N 2 16 O, 14 N 15 N 16 O, 15 N 14 N 16 O, and 14 N 2 18 O isotopologues were assigned.…”

“…The line lists constructed in Ref. [1] for each N 2 O isotopologue have allowed improving the predictions for the ΔP=14-16 series of transitions in the frame of the effective operator approach. The present work will benefit of these improved predictions (See below).…”

“…The aim of this work is to extend and improve the rotational analysis of the previously observed bands and to reduce the fraction of unassigned lines (about 20% in Ref. [1]). As an illustration of the accuracy of the line center determination achieved by referencing the spectra to a self-referenced frequency comb, the small self-induced pressure shift of the two strongest bands (less than 10 -4 cm -1 ) is presently determined by difference of the line positions at 1 and 10 Torr and used to obtain the zero-pressure value of the line positions (Section 3).…”

“…The pressure-shift corrected values of the 10 Torr line positions measured in this work and of the 1 Torr positions values reported in Ref. [1] were used as input datasets of a fit providing accurate band-by-band spectroscopic constants. Six local perturbations are evidenced and analyzed in the region, including two interpolyad interactions.…”