Interaction of Vibrational Fundamental and Combination States of Ethylene in the 3 μm Region

High-resolution spectroscopy and preliminary global analysis of C–H stretching vibrations of C2H4 in the 3000 and 6000cm−1 regions

“…Table 4 just compares the band centers found in this work with those from the two previously cited references, showing a good agreement. In Appendix B, we also compare the rovibrational levels that were observed in the present polyad P 2 by Sartakov et al [32] with those resulting form the present fit. There is a global good consistency with previous analyses for the literature, although some differences are observed.…”

“…As a matter of fact, previous analyses give some better results for each region when considered separately. Reference [32] uses very high resolution laser spectroscopy data to investigate the 3 µm region; the fit includes 34 vibrational states. In the 1.6 µm region, the authors of [42] include several dark states to obtain a satisfying fit.…”

“…Value / cm −1 ν 9 /ν 11 4 4(4, 0B 3g ) 000000001000B 2u 000000000010B 1u 0.0 ν 9 /ν 11 4 4(4, 1B 3g ) 000000001000B 2u 000000000010B 1u 0.0 ν 9 /ν 11 5 5(1, 0B 3g ) 000000001000B 2u 000000000010B 1u 0.0 ν 9 /ν 11 5 5(3, 0B 3g ) 000000001000B 2u 000000000010B 1u 0.0 ν 9 /ν 11 5 5(3, 1B 3g ) 000000001000B 2u 000000000010B 1u 0.0 ν 9 /ν 11 5 5(5, 0B 3g ) 000000001000B 2u 000000000010B 1u 0.0 ν 9 /ν 11 5 5(5, 1B 3g ) 000000001000B 2u 000000000010B 1u 0.0 ν 9 /ν 11 5 5(5, 2B 3g ) 000000001000B 2u 000000000010B 1u 0.0 ν 9 /ν 11 6 6(2, 0B 3g ) 000000001000B 2u 000000000010B 1u 0.0 ν 9 /ν 11 6 6(4, 0B 3g ) 000000001000B 2u 000000000010B 1u 0.0 ν 9 /ν 11 6 6(4, 1B 3g ) 000000001000B 2u 000000000010B 1u 0.0 ν 9 /ν 11 6 6(6, 0B 3g ) 000000001000B 2u 000000000010B 1u 0.0 ν 9 /ν 11 6 6(6, 1B 3g ) 000000001000B 2u 000000000010B 1u 0.0 ν 9 /ν 11 6 6(6, 2B 3g ) 000000001000B 2u 000000000010B 1u 0.0 ν 9 /ν 11 0 0(0, 0A The following tables (B.2 and B.3) compare the ν 9 and ν 11 rovibrational levels measures by Sartakov et al [32]with the present study, respectively. …”

“…As already mentioned above, it is based on the work of Sartakov et al [32]. It uses the formalism developed in Dijon for octahedral XY 6 molecules in the O(3) ⊃ O h group chain [33,34,35].…”

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

“…The most extensive empirical model for the ethylene vibrational levels to date has been considered by Georges et al (1999) based on the information from previous high-resolution studies Sartakov et al 1997;Rusinek et al 1998;Bach et al 1999;Oomens et al 1996Oomens et al , 1994a. In the entire data set, spectral analyses remain quite sparse: of the 200 vibrational bands up to 4000 cm −1 , only 16 were completely or partially modeled.…”