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

76 Poster session, D29Spectroscopy of ammonia 14 NH3 and 15 NH3with VECSEL laser source in the infrared 2.3 mm range.Patrice Cacciani 1 , Peter Cermak 1, 2 , Jean Cosléou 1 , Mohamed Khelkhal 1 , JamilaEl Romh 11PhLAM, UMR CNRS 8523, France, Patrice.Cacciani@univ-lille1.fr;Cacciani P.Cermak P.Cosleau J.Khelkhal M.El Romh J.2DEP, Comenius University Bratislava, Slovakia, cermak@fmph.uniba.sk;A VECSEL laser source allows to perform spectroscopy of two isotopomers ofammonia 14 NH 3 and 15 NH 3 in the range 4275-4340 cm -1 . This corresponds to thelocation of combination bands n 1+n 2(-), n 1+n 2(+)and n 2+n 3 involving inversion bendingcoordinate.For 14 NH 3 the observed transitions can be compared with the HITRAN data base.Twice more lines have been measured with high resolution and the analysis of thetemperature dependence of the spectra allows to confirm or infirm the assignments.Through this method some new assignments are possible by the knowledge on thelower level of transitions.For 15 NH 3 this energy range is not present in HITRAN. We first propose a line list atroom temperature. The spectra will tentatively be analysed with the help of differenttechniques: isotopic shift (VISTA) 1 , Ground state combination difference (GSCD),evolution with temperature (information on lower state of transitions) 2 and comparisonwith calculated line list (EXOMOL program) 3 .XY Graph Process UP1.306451.210.80.60.40.20-0.2741944327.97 4328.2 4328.4 4328.6 4328.8 4329 4329.2 4329.4 4329.6 4329.8 4330XFigure 1: An example of NH3 spectrum at 160K4330.24References[1] Lees R., Li L., Xu L.H. New vista on ammonia in the 1.5mm region: Assignmentsfor the n 3+2n 4 bands of 14 NH 3 and 15 NH 3 by isotopic shift labeling.J. Mol. Spectr. 251, 241, 2008[2] Cacciani P. , Cermak P., Cosléou J., Khelkhal M., Jeseck P., Michaut X.New progress in spectroscopy of ammonia in the infrared 1.5 mm range usingevolution of spectra from 300 K down to 122 K. J. Quant. Spectrosc. Radiat. Transfer ,doi:10.1016/ j.jqsrt.2012.02.026., 2012[3] Yurchenko S.N., Barber R.J., Yachmenev A., Thiel W., Jensen P., Tennyson J.A Variationally Computed T=300 K Line List for NH 3. J Phys Chem A 113, 11845,2009