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

Juho Karhu, Janko Nauta, Markku Mikael Vainio, Markus Ilari Metsälä, Steven Hoekstra, Lauri Olavi Halonen

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

Abstrakti

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.
Alkuperäiskielienglanti
LehtiJournal of Chemical Physics
Vuosikerta144
Numero24
Sivumäärä7
ISSN0021-9606
DOI - pysyväislinkit
TilaJulkaistu - 22 kesäkuuta 2016
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä, vertaisarvioitu

Tieteenalat

  • 116 Kemia
  • SPECTROSCOPY
  • Spectroscopy, infrared
  • Spectroscopy, high-resolution

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