Foreign-gas broadening of the J = 5 → 6 rotational transition of nitrous oxide

Buffer-gas pressure broadening for the (0003)←(0000) band of N2O measured with continuous-wave cavity ring-down spectroscopy

“…4 along with the literature values for the m 3 and 2m 3 bands [4,6], and the pure rotational transitions [9][10][11][12][13][14]. Our results of the N 2 -and O 2 -broadening coefficients obtained for the 3m 3 band are in good agreement with the most of the literature values listed above.…”

“…The values of c decrease with jmj: a trend observed by our previous measurement and other groups conducting broadening measurements [3][4][5][6][7][8][9][10][11][12][13][14]22]. Based on the impact approximation, c is expressed from the cross-sections in the terms of the Weiskopf radius, the number density of the collision partner, and the mean relative velocity of the collision partner [29].…”

“…In their [6]), and 2m 3 (j, [4]) bands, and pure rotational transitions (., [9][10][11][12][13][14]). Theoretical results reported by Rohart et al [13]: total potential involving the atom-atom Lennard-Jones interactions in addition to electronic interactions of dipole, quadrupole, octopole, and hexadecapole (solid curves) or by neglecting in the electrostatic potential the octopole and hexadecapole moment of the absorber and the perturbers (dashed curves).…”

“…Parkes et al [8] reported for the 3m 3 band at 1.5 lm at room temperature. In addition, several measurements have also been performed for the pure rotational transitions of N 2 O in the J = 1-0 [9], 6-5 [10], 9-8 [11], 20-19, 24-23 [12], 22-21, 23-22 [13], , and 26-25 [14] transitions. In the present study, we have measured the pressure broadening coefficients in the 3m 3 band (1.52-1.53 lm) with various buffer gases (N 2 , O 2 , He, Ar, Ne, Kr and Xe) as a function of the rotational quantum number, and their temperature dependence (broadening exponent) with cavity ring-down spectroscopy (CRDS) using a tunable diode laser.…”

Detailed profile analysis of millimetre 502 and 602 GHz N2O–N2(O2) lines at room temperature for collisional linewidth determination

“…This molecule participates actively in NOx formation and, as a consequence, in ozone layer depletion; it acts also as an efficient greenhouse gas. While the absorption frequencies of the pure rotational lines of N 2 O are very well known, their collisional broadening coefficients by O 2 or N 2 have only been determined from a few laboratory experiments: J ¼ 6 5 [2], J ¼ 9 8 [3], J ¼ 1 0 [4][5][6], J ¼ 25 24, 26 25 [7], J ¼ 8 7, 22 21, 23 22 [8]. In contrast, extensive studies have been undertaken of various N 2 O-N 2 (O 2 ) vibrational bands in the infrared (IR) absorption domain, from which we mention particularly the detailed experiments [9] and the recent extensive work [10].…”