Sub-doppler spectroscopy of the ν3 band of methane

Kocheril, Philip A.

Permalink

https://hdl.handle.net/2142/100798 Copy

Description

Title

Sub-doppler spectroscopy of the ν3 band of methane

Author(s)

Kocheril, Philip A.

Contributor(s)

• McCall, Benjamin J.
• Dieter, Thomas S
• Schrader, Alex W
• Esposito, Anne Marie
• Markus, Charles R.

Issue Date

2018-06-18

Keyword(s)

Linelists, Lineshapes, Collisions

Abstract

Methane has been observed in brown dwarfsa and planetary atmospheres, including planets in our solar systemb and extrasolar planets.c Methane is also a potent greenhouse gasd and relevant to ozone formation and depletion in Earth’s atmosphere.e As the simplest stable hydrocarbon, methane is also a benchmark for state-of-the-art ab initio calculations.f While methane is a strong absorber due to its characteristically large transition dipole moments, transition frequencies were historically limited by Doppler broadening, and many frequencies are still known only to Doppler-limited precision. We have constructed a double-pass saturation experiment to perform sub-Doppler spectroscopy of rovibrational transitions of methane. With the accuracy provided by optical frequency combs, we have measured 22 methane transitions from the ν3 band in the 3 µm region to MHz-level uncertainty, improving the accuracy of the rest frequencies by at least an order of magnitude. This data can be used for higher-precision models of methane as an ab initio benchmark.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100798

DOI

10.15278/isms.2018.MI02

Copyright and License Information

Copyright 2018 Philip A. Kocheril

Owning Collections