Double resonant absorption measurement of acetylene symmetric vibrational states probed with cavity ring down spectroscopy

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http://hdl.handle.net/10138/165532

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Karhu , J , Nauta , J , Vainio , M M , Metsälä , M I , Hoekstra , S & Halonen , L O 2016 , ' Double resonant absorption measurement of acetylene symmetric vibrational states probed with cavity ring down spectroscopy ' , Journal of Chemical Physics , vol. 144 , no. 24 . https://doi.org/10.1063/1.4954159

Titel: Double resonant absorption measurement of acetylene symmetric vibrational states probed with cavity ring down spectroscopy
Författare: Karhu, Juho; Nauta, Janko; Vainio, Markku Mikael; Metsälä, Markus Ilari; Hoekstra, Steven; Halonen, Lauri Olavi
Medarbetare: University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
Datum: 2016-06-22
Språk: eng
Sidantal: 7
Tillhör serie: Journal of Chemical Physics
ISSN: 0021-9606
Permanenta länken (URI): http://hdl.handle.net/10138/165532
Abstrakt: A novel mid-infrared/near-infrared double resonant absorption setup for studying infrared-inactive vibrational states is presented. A strong vibrational transition in the mid-infrared region is excited using an idler beam from a singly resonant continuous-wave optical parametric oscillator, to populate an intermediate vibrational state. High output power of the optical parametric oscillator and the strength of the mid-infrared transition result in efficient population transfer to the intermediate state, which allows measuring secondary transitions from this state with a high signal-to-noise ratio. A secondary, near-infrared transition from the intermediate state is probed using cavity ring-down spectroscopy, which provides high sensitivity in this wavelength region. Due to the narrow linewidths of the excitation sources, the rovibrational lines of the secondary transition are measured with sub-Doppler resolution. The setup is used to access a previously unreported symmetric vibrational state of acetylene, nu(1) + nu(2) + nu(3) + nu(1)(4) + nu(-1)(5) in the normal mode notation. Single-photon transitions to this state from the vibrational ground state are forbidden. Ten lines of the newly measured state are observed and fitted with the linear least-squares method to extract the band parameters. The vibrational term value was measured to be at 9775.0018(45) cm(-1), the rotational parameter B was 1.162 222(37) cm(-1), and the quartic centrifugal distortion parameter D was 3.998(62) x 10(-6) cm(-1), where the numbers in the parenthesis are one-standard errors in the least significant digits. Published by AIP Publishing.
Subject: 116 Chemical sciences
SPECTROSCOPY
Spectroscopy, infrared
Spectroscopy, high-resolution
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