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

Poster session, D20 67Diode laser absorption spectrum of cold bands of NH 3 near 6500 cm -1Gii G. Brougher 1 , Mingjie Chen 1 , Thomas P. Dannenhoffer 1 , Ryan M. Everett 1 ,Jessica A. Foelker 1 , John L. Hardwick 2 , Jesse Huang 1 , Zhongjie Huang 1 , LoganG. Kostur 1 , Philip A. Kovac 1 , Graham S. O'Brien Johnson 1 , Sae Hyoung Oh 1 ,Spencer J. Robertson 1 , Luke W. Sitts 1 , Sara R. Tepfer 1 , Lucas T. Thompson 1 ,Kelsey A. Wahl 1 , Clarissa A. Warrick 1 , Nicholas C. Weldon 1 , and Richard D.Westover 11 Department of Chemistry, University of Oregon, Eugene, OR USA; 2 Department ofChemistry, University of Oregon, Eugene, OR USA, hardwick@uoregon.eduThe near infrared spectrum of ammonia has been recorded at 195, 295, and 373 K in thewavenumber range from 6175 to 6800 cm -1 using external cavity tunable diode laserspectrometers. Extracting lower state term values based on the temperature dependenceof the spectra is in good agreement with published data 1 for strong lines, but thecomparison is poorer for weaker features. In the region between 6175 and 6360 cm -1the spectra have been recorded using a Herriott cell with a 50 meter path length in orderto improve the signal/noise ratio while avoiding pressure broadening. Several newrotational assignments have been established based on the temperature dependence ofintensity and ground state combination differences, including some in the weak regionof the spectrum between 6175 and 6370 cm -1 .AcknowledgementThis work was a class project of the Physical Chemistry Laboratory at the University ofOregon. The authors are grateful to the University of Oregon and the Department ofChemistry Instructional Laboratories for their support.Brougher G.G.Chen M.Dannenhoffer T.P.Everett R.M.Foelker J.A.Hardwick J.L.Huang J.Huang Z.Kostur L.G.Kovac P.A.O’Brien JohnsonOh S.H.Robertson S.J.Sitts L.W.Tepfer S.R.Thompson L.T.Wahl K.A.Warrick C.A.Weldon N.C.Westover R.D.References[1] K. Sung, L. R.Brown, , X. Huang, D. W. Schwenke, T. J. Lee, S. L. Coy, K. K.Lehmann, J. Quant. Spectrosc. Radiat. Transfer, 113(11), 1066–1083, 2012.doi:10.1016/j.jqsrt.2012.02.