High-resolution spectroscopic study of the H2O–CO2 van der Waals complex in the 2OH overtone range. (2nd June 2020)

• Record Type: Journal Article
• Authors: Lauzin, C.; Imbreckx, A. C.; Foldes, T.; Vanfleteren, T.; Moazzen-Ahmadi, N.; Herman, M.
• Is Part Of: Molecular physics. Volume 118:Number 11(2020)
• Publication Date: 2020-06-02
• Subjects: Van der Waals complexes -- tunnelling -- cavity ring-down -- combination band; Molecules -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Molécules -- Périodiques; Chimie physique et théorique -- Périodiques; 539.6.05
• DOI: 10.1080/00268976.2019.1706776
• Languages: English
• ISSNs: 0026-8976

Abstract

Abstract : The jet-cooled spectrum ( T r o t = 12 K) of the H 2 O–CO 2 van der Waals complex has been recorded in the 1.4 μm region by cavity ring-down spectroscopy. Two b -type vibrational bands have been observed and analysed. The rotational assignment has been achieved using a different asymmetric rotor Hamiltonian for each nuclear spin species, accounting for the internal rotation of the H 2 O and CO 2 units. The band at 7247 cm − 1 is assigned to (101) in terms of the ( v 1 v 2 v 3 ) vibrational quantum number of the H 2 O monomer. The band at 7238 cm − 1 is assigned to (200) + an intermolecular mode ( v 12 ) excited in the complex. Vibration-rotation constants are provided for the excited states. The symmetry of the wavefunction, the effect of vibrational excitation on the tunnelling dynamics and the vibrational assignment are discussed. GRAPHICAL ABSTRACT: