Abstract book - Prof. Per Jensen, Ph.D. - Bergische Universität ...

Poster session, D14 61A new analysis of the ν 7 band of ethaneMarcela Tudorie, 1 Carlo di Lauro, 2 Franca Lattanzi, 2 Jean Vander Auwera 11 Service de Chimie Quantique et Photophysique, C.P. 160/09, Université Libre deBruxelles, 50 avenue F.D. Roosevelt, B-1050 Brussels, Belgium, jauwera@ulb.ac.be;2 Chimica Fisica, Università di Napoli Federico II, 49 via D. Montesano, I-80131 Napoli,Italy, car.dilauro@gmail.comTudorie M.Di Lauro C.Lattanzi F.Vander AuweraEthane is a prolate symmetric top involving two coaxial identical internal rotors. Its fiveinfrared active fundamental transitions define 3 main spectral regions, around 12, 6.2–7.5 and 3.3 µm, all of interest for remote sensing measurements. In this context, the CHstretching fundamental band ν 7 near 2985 cm –1 is particularly useful because it exhibitsa series of very strong Q-branches that can provide a sensitive detection of C 2H 6. 1,2Unfortunately, this spectral region is complex and difficult to model. 3,4The present work builds upon the recent contributions by Lattanzi et al 3 and Villanuevaet al. 4 We rely on high-resolution Fourier transform spectra recorded in our laboratoryand on previous assignments. 3,5,6 Because of the complexity of the energy levelsstructure at 3.3 µm, we treat each K sub-band separately, an approach similar toprevious work. 4-6 The description of perturbations given in Ref. 3 was found to beparticularly helpful to assign higher J and K lines. The latest results will be presented.References[1] A.S. Pine, C.P. Rinsland, J. Quant. Spectrosc. Radiat. Transfer 62, 445, 1999.[2] K. Magee-Sauer, M.J. Mumma, M.A. DiSanti, N. Dello Russo, E.L. Gibb, B.P.Boney, G.L. Villanueva, Icarus 194, 347, 2008.[3] F. Lattanzi, C. di Lauro, J. Vander Auwera, J. Mol. Spectrosc. 267, 71, 2011.[4] G. L. Villanueva, M. J. Mumma, K. Magee-Sauer, J. Geophys. Res. 116, E08012,2011.[5] A.S. Pine, W.J. Lafferty, J. Res. Natl. Bur. Stand. 87, 237, 1982.[6] A.S. Pine and S.C. Stone, J. Mol. Spectrosc. 175, 21, 1996.AcknowledgmentsThe authors thank M. Herman for making his jet-cooled spectra of ethane available.Financial support from the Fonds de la Recherche Scientifique (F.R.S.-FNRS, Belgium,contract FRFC), the Action de Recherches Concertées of the Communauté française deBelgique, and the Belgian Federal Science Policy Office (contract SD/CS/07A,Advanced Exploitation of Ground-Based Measurements for Atmospheric Chemistry andClimate applications – II) is gratefully acknowledged.