CH3D near infrared cavity ring-down spectrum reanalysis and IR-IR double resonance

Yang, Shaoyue

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https://hdl.handle.net/2142/79314 Copy

Description

Title

CH3D near infrared cavity ring-down spectrum reanalysis and IR-IR double resonance

Author(s)

Yang, Shaoyue

Contributor(s)

• Lehmann, Kevin
• Schwartz, George

Issue Date

22-Jun-15

Keyword(s)

Linelists

Abstract

As one of the most important hydrocarbon prototype molecules, CH$_{3}$D’s overtone band in near infrared region has not been well studied. Various methods were used to help identifying transitions from previous cavity ring down spectrum of CH$_{3}$D in the near infrared region. Symmetric top molecules’ Hamiltonian diagonal terms for the ground state, perpendicular state and parallel state were simulated by software PGopher. Combination differences were used to find possible pairs of transitions starting from adjacent ground state and ending in same excited states. Also we introduced our temperature controlled spectrum setup for ground state energy and rotational quanta prediction from temperature dependence, and proven to be working well for lower J levels for CH$_{4}$. At last, we set up a double resonance system, using two lasers (3.3 and 1.65 $\mu$m, respectively) to excite transitions from the same ground state, to provide strong proof for the lower state quanta.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

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http://hdl.handle.net/2142/79314

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