Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7846254 | Journal of Quantitative Spectroscopy and Radiative Transfer | 2018 | 19 Pages |
Abstract
A 13C-enriched spectrum of methane (13CH4) was recorded at Doppler-limited resolution (0.0044 cmâ1) at 80â¯K covering the entire Tetradecad region in the 4970-6200 cmâ1. In this paper we present the spectral analysis of the lower part of the 13CH4 Tetradecad in the 4970-5470 cmâ1 region. Starting with a non-empirical effective Hamiltonian derived by high-order Contact Transformations (CT) from the ab initio potential energy surface (PES), the effective Hamiltonian parameters have been determined for this region by extending the previous DAS (Differential Absorption Spectroscopy) spectral analysis for the upper part of the Tetradecad in the 5853-6200 cmâ1 region. In total, 1387 rovibrational transitions were assigned belonging to five cold bands of the Tetradecad up to Jmaxâ¯=â¯11. Their positions were fitted with an rms deviation of 1.6â¯Ãâ¯10â3 cmâ1. Measured line intensities for 737 transitions were modeled using the effective dipole transition moments approach with an rms deviation of about 10%. Finally, the observed transitions were incorporated to fit simultaneously the 13CH4 Hamiltonian parameters for the {Ground state / Dyad / Pentad / Octad / Tetradecad} system and the dipole moment parameters for the {Ground state - Tetradecad} system.
Related Topics
Physical Sciences and Engineering
Chemistry
Spectroscopy
Authors
Evgeniya Starikova, Keeyoon Sung, Andrei V. Nikitin, Michael Rey, Arlan W. Mantz, Mary Ann H. Smith,