Absolute line intensities and self-broadened half-width coefficients in the ethylene-1-13C bands in the 700–1190cm−1 region

The ν4, ν9, ν10 and ν6+ν11 bands of 12CH313CH3 between 1345 and 1557cm−1

“…1 near 1300 cm À1 ) were roughly estimated to be $1.5% and $0.3%, respectively [7,21], but no lines of 13 CH 4 were discerned, however. Very weak absorptions of 12 C 13 CH 4 (m 7 near 948 cm À1 ) were also observed in another spectrum recorded with 15 times more gas pressure; this impurity was estimated to be less than 0.7% by retrieving a few line intensities and comparing them to available standards [22]. Assuming negligible impurity from 13 CH 3 13 CH 3 , we conclude that the gas sample in the cell was $97.5% 12 CH 3 13 CH 3 .…”

“…The maximum value of J in the observed perpendicular transitions was 23. Parallel band ( q P and q R) line positions of m 4 were included for K from 0 to 10 and maximum J equal to 22. Improved values of the ground state rotational constants B, D J and D JK were determined from 107 selected combination differences of the m 9 band, with K up to 8 and J up to 23.…”

First theoretical global line lists of ethylene (12C2H4) spectra for the temperature range 50−700 K in the far-infrared for quantification of absorption and emission in planetary atmospheres

“…A preliminary analysis of line positions the 1.6 µm region was carried out using a very crude effective model, including only the ν 5 + ν 9 /ν 5 + ν 11 system (Lorono et al 2010). A series of papers was devoted to the study of ethylene isotopologs (see De Vleeschouwer et al 1982;Flaud et al 2011Flaud et al , 2010Tan et al 2015b,a;Ulenikov et al 2015;Gabona et al 2014;Gabona & Tan 2014a,b;Tan & Gabona 2012, and references therein). Most available analyses of ethylene laboratory spectra only consider line positions.…”

High-resolution FTIR analysis and rotational constants for the ν12 band of ethylene-1-13C (13C12CH4)

“…Flaud et al [6] Tan and Lebron [7] This work Rms deviation (cm À1 ) À 0.00090 0.00032 D (lÅ 2 ) 0.0533(72) 0.05376(4) 0.05381 (8) a The uncertainty in the last digits (twice the estimated standard error) is given in parentheses. b Fixed to ground state value of 12 C 2 H 4 [11].…”

“…More recently, Flaud et al [8] followed up their analysis on the five interacting bands (m 4 , m 6 , m 7 , m 8 , m 10 ) of 13 C 12 CH 4 with line and band intensity measurements.…”