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EXPERIMENTAL ABSORPTION SPECTRA OF HOT CH 4 IN THE PENTAD AND OCTAD REGION ROBERT J. HARGREAVES rhargrea@odu.edu MICHAEL DULICK mdulick@odu.edu PETER F. BERNATH pbernath@odu.edu MONDAY 16 TH JUNE 2014

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CH 4 POLYADS ModeDegeneracyBand Origin (cm -1 )Type 1 (a 1 )12914Symmetric C-H stretch 2 (e)21526Bend 3 (t 2 )33020 a Asymmetric C-H stretch 4 (t 2 )31306 a Bend 22 33 44 11 T d symmetry a infrared active 1 3 2 2 2 4

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CH 4 POLYADS S. Albert et al. 2009, Chem. Phys. 356, 131

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MOLECULAR ATMOSPHERES 1000 2000 30004000 5000 6000 7000 8000 The Sun - 5800 K (e.g., CN, OH, CH, NH) Sunspots - 3200 K (e.g., H 2 O, TiO) Brown Dwarfs Dwarf Stars Stars Exoplanets H+H+ Diatomic Molecules Polyatomic Molecules Temperature / K EARTH 296 K HITRAN database H 2 O NH 3 CH 4 0

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MOLECULAR ATMOSPHERES 1000 2000 30004000 5000 6000 7000 8000 Brown Dwarfs Dwarf Stars Stars Planets H+H+ Diatomic Molecules Polyatomic Molecules Temperature / K H 2 O NH 3 CH 4 0 Brown dwarfs Not planets