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- W2103266234 abstract "The compilation of methane molecular line parameters was updated to include new global analyses and measurements for 12CH4, 13CH4 and 12CH3D. Over 70% of the methane parameters in HITRAN2008 were replaced; existing parameters retained were the microwave lines and the Dyad of 13CH4 near 7 μm and ν6 of 13CH3D near 8.7 μm, 12CH3D (7–4076 cm−1), hot bands of 12CH4 (1887–3370 cm−1) and normal sample CH4 (4800–5550 cm−1 and 8000–9200 cm−1). With a minimum intensity at 296 K in units of cm−1/(molecule cm−2) set to 10–37 for the far-IR and 10–29 for the mid- and near-IR, the methane database increased from 290,091 lines in HITRAN2008 to 468,013 lines, and three-fourths of these involved the main isotopologue. For 12CH4 and 13CH4, bands from the ground state were revised up to 4800 cm−1. For the first time, 13CH4 and 12CH3D line parameters near 2.3 μm were included. Above 5550 cm−1, the new compilation was based on empirical measurements. Prior laboratory results were replaced with extensive new measurements using FTIR (5550–5852 cm−1), differential absorption spectroscopy (DAS) and Cavity Ring Down Spectroscopy (CRDS) (5852–7912 cm−1). Ground state J values for nearly half of the measured lines in this range were obtained, either by confirming quantum assignments of analyses or by using spectra at 80 and 296 K. Finally, over 11,000 measured positions, intensities and empirical lower state energies (obtained using cold CH4) were also added for the first time between 10,923 and 11,502 cm−1. Available pressure broadening measurements from HITRAN2008 were transferred into the new compilation, but 99% of the lines were given crudely-estimated coefficients. New measured intensities and broadening coefficients were included for far-IR transitions, and high accuracy line positions were inserted for the stronger P, Q and R branch transitions of ν3 at 3.3 μm and 2ν3 at 1.66 µm." @default.
- W2103266234 created "2016-06-24" @default.
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- W2103266234 date "2013-11-01" @default.
- W2103266234 modified "2023-10-18" @default.
- W2103266234 title "Methane line parameters in the HITRAN2012 database" @default.
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