Title :

Fourier Transform Microwave and Millimeter-Wave Spectroscopy of Bromoiodomethane, CH₂BrI

Author(s) :

Bailleux, Stéphane [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Duflot, Denis [Auteur]
Physico-Chimie Moléculaire Théorique [PCMT]
Taniguchi, Keisuke [Auteur]
Sakai, S. [Auteur]
Ozeki, Hiroyuki [Auteur]
Bailey, W. C. [Auteur]
Obakayashi, Tomohito [Auteur]

Journal title :

Journal of Physical Chemistry A

Pages :

11744

Publisher :

American Chemical Society

Publication date :

2014-11-24

ISSN :

1089-5639

HAL domain(s) :

Physique [physics]/Physique [physics]/Chimie-Physique [physics.chem-ph]

English abstract : [en]

Bromoiodomethane, CH₂BrI, is a molecule of natural origin emitted in significant amount into the marine boundary layer. It can easily be decomposed by solar radiation, releasing Br and I atoms in the troposphere, ...
Show more >Bromoiodomethane, CH₂BrI, is a molecule of natural origin emitted in significant amount into the marine boundary layer. It can easily be decomposed by solar radiation, releasing Br and I atoms in the troposphere, which in turn impacts the atmospheric chemistry. Spectroscopy is an invaluable tool to monitor species present in the atmosphere. Since no high-resolution spectroscopic studies are available for this dihalomethane, we have investigated the rotational spectra of the two bromine isotopologues of CH₂BrI in its vibrational ground state in the microwave and millimeter-wave regions. Transitions of b-type have been recorded by Fourier transform microwave spectroscopy below 25 GHz while both a- and b-type spectral lines have been measured below 230 GHz. Observed transitions correspond to energy levels with J ≤ 132 and Ka ≤ 14. Molecular constants including those describing the nuclear quadrupole coupling tensors for ⁷⁹Br, ⁸¹Br, and ¹²⁷I were accurately determined from the least-squares analysis of a total of 1873 distinct transition frequencies (of which 943 belong to the CH₂⁷⁹BrI isotopologue). An experimental (r₀) structure of the title species has been derived from the two sets of rotational constants.Show less >

Language :

Anglais

Popular science :

Non

ANR Project :

Physiques et Chimie de l'Environnement Atmosphérique

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL