First far-infrared high resolution analysis of the ν3 band of phosgene 35Cl2CO and 35Cl37ClCO
Abstract
The high-resolution absorption spectra of phosgene (Cl2CO) has been recorded at 0.001 cm-1 resolution in the 250-350 cm-1 region by Fourier transform spectroscopy at synchrotron SOLEIL. To reduce the spectral congestion, the spectra have been recorded at low temperature (197 K) using a 93.14 m optical path length cryogenic cell. This enables the first detailed infrared analysis of the ν3 bands of the 35Cl2CO and 35Cl37ClCO isotopologues of phosgene. Using a Watson-type Hamiltonian, it was possible to reproduce the upper state rovibrational infrared energy levels, together with, for 35Cl2CO, the available microwave data in the 31 excited state (Yamamoto et al. 1984) to within their experimental accuracy. In this way, accurate rotational and centrifugal distortion constants together with the following band centers: ν0(ν3, 35Cl2CO) = 301.545622(17) cm-1 and ν0(ν3, 35Cl37ClCO) = 298.199194(81) cm-1, were derived for the ν3 bands of 35Cl2CO and 35Cl37ClCO.
- Publication:
-
Journal of Molecular Spectroscopy
- Pub Date:
- August 2016
- DOI:
- 10.1016/j.jms.2015.12.001
- Bibcode:
- 2016JMoSp.326...90N
- Keywords:
-
- Phosgene;
- Far infrared;
- High-resolution spectra;
- Line position analysis;
- Hamiltonian constants;
- SOLEIL synchrotron