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

J. Karhu, J. Nauta, M. Vainio, M. Mets�l�, S. Hoekstra, L. Halonen

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

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, ν 1 + ν 2 + ν 3 + ν 4 1 + ν 5 - 1 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) � 10-6 cm-1, where the numbers in the parenthesis are one-standard errors in the least significant digits.

Original languageEnglish
Article number244201
JournalJournal of Chemical Physics
Volume144
Issue number24
DOIs
Publication statusPublished - 28 Jun 2016
MoE publication typeA1 Journal article-refereed

Fingerprint

Acetylene
vibrational states
acetylene
Spectroscopy
Infrared radiation
cavities
rings
spectroscopy
Optical parametric oscillators
parametric amplifiers
digits
least squares method
Electron transitions
Linewidth
oscillator strengths
Ground state
continuous radiation
Signal to noise ratio
coding
signal to noise ratios

Cite this

Karhu, J. ; Nauta, J. ; Vainio, M. ; Mets�l�, M. ; Hoekstra, S. ; Halonen, L. / Double resonant absorption measurement of acetylene symmetric vibrational states probed with cavity ring down spectroscopy. In: Journal of Chemical Physics. 2016 ; Vol. 144, No. 24.
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abstract = "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, ν 1 + ν 2 + ν 3 + ν 4 1 + ν 5 - 1 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) {\"i}¿½ 10-6 cm-1, where the numbers in the parenthesis are one-standard errors in the least significant digits.",
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Double resonant absorption measurement of acetylene symmetric vibrational states probed with cavity ring down spectroscopy. / Karhu, J.; Nauta, J.; Vainio, M.; Mets�l�, M.; Hoekstra, S.; Halonen, L.

In: Journal of Chemical Physics, Vol. 144, No. 24, 244201, 28.06.2016.

Research output: Contribution to journalArticleScientificpeer-review

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