Laser locked cavity ringdown spectroscopy of the (31−) local mode band system of H¹³C¹³CH

Joseph Guss (1) , Markus Metsälä (2) , Markku Vainio (2) , Olavi Vaittinen (2) , Lauri Halonen (2)

1 Laboratory of Physical Chemistry
2 Helsingin yliopisto = Helsingfors universitet = University of Helsinki

In this article we present the spectrum of H¹³C¹³CH near 13 000 cm⁻¹ and its ro-vibrational analysis. Our high repetition rate cavity ringdown spectrometer was used to record the spectrum. Seven vibrational bands, including six to previously unobserved vibrational states, were recorded and rotationally analysed. The band origin of the cold 3010⁰0⁰ stretching vibrational combination transition ((31−) in the local mode notation) was measured at 12960.28807(38) cm⁻¹. The vibrational transition dipole moments were determined through intensity measurements of the spectral peaks. The values of the unperturbed vibrational transition dipole moment, |R⁰_v'v''|², and the first Herman--Wallis coefficient, A₁, for the 3010⁰0⁰ band were found to be 1.1570(26) × 10⁻⁹ D² and −9.5(6) × 10⁻⁴, respectively. The numbers in parentheses represent one-standard error in the least significant digits.

Mots clés: Physical Sciences

Joseph Guss, Markus Metsälä, Markku Vainio, Olavi Vaittinen, Lauri Halonen. Laser locked cavity ringdown spectroscopy of the (31−) local mode band system of H¹³C¹³CH. Molecular Physics, 2007, 105 (05-07), pp.807-813. ⟨10.1080/00268970601129068⟩. ⟨hal-00513068⟩