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High-sensitivity CRDS absorption spectrum of 17O enriched carbon dioxide near 1.74 µm.

Authors :
Mondelain, D.
Karlovets, E.V.
Perevalov, V.I.
Tashkun, S.A.
Campargue, A.
Source :
Journal of Molecular Spectroscopy. Aug2019, Vol. 362, p84-89. 6p.
Publication Year :
2019

Abstract

• High sensitivity CRDS of CO 2 enriched in 17O in the 1.74 µm transparency window. • About 1100 transitions assigned to 26 bands of the six 17O isotopologues of CO 2. • Very weak lines with intensity value of about 2 × 10−29 cm/molecule are detected. • Spectroscopic parameters of the upper vibrational levels are determined from a band-by-band fit. The room temperature absorption spectrum of 17O enriched carbon dioxide is investigated by high sensitivity cavity ring down spectroscopy (CRDS) between 5695 and 5850 cm−1. About 1100 lines are measured and assigned to 26 bands of the six 17O containing carbon dioxide isotopologues: 16O12C17O, 16O13C17O, 17O12C18O, 17O13C18O, 12C17O 2 and 13C17O 2. The set of observed lines are rovibrationnally assigned on the basis of the predictions of the effective Hamiltonian (EH) model. The observed bands belong to the ΔP = 8 and 9 series of transitions where P = 2 V 1 + V 2 + 3 V 3 is the polyad number (V i being the vibrational quantum numbers). They consist in 12 previously unobserved bands and 14 already-known bands, for which additional high J lines are assigned. Bands of the 12C17O 2 and 13C17O 2 isotopologues (two for each) are observed for the first time in this spectral interval. The spectroscopic parameters of the upper vibrational levels are determined from a band-by-band fit of the line positions (typical rms deviations are less than 0.001 cm−1). The comparison to the most recent carbon dioxide spectroscopic databases is presented. The reported data will be used to improve the modeling of the line positions of 17O containing carbon dioxide isotopologues. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00222852
Volume :
362
Database :
Academic Search Index
Journal :
Journal of Molecular Spectroscopy
Publication Type :
Academic Journal
Accession number :
137594995
Full Text :
https://doi.org/10.1016/j.jms.2019.06.004