First far-IR spectra of 2,2-d2-propane: The ν9 (A1) B-type band near 365.3508 cm−1. The determination of ground and upper state constants

Gjuraj, Daniel

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https://hdl.handle.net/2142/100543 Copy

Description

Title

First far-IR spectra of 2,2-d2-propane: The ν9 (A1) B-type band near 365.3508 cm−1. The determination of ground and upper state constants

Author(s)

Gjuraj, Daniel

Contributor(s)

• Billinghurst, Brant E.
• Flaud, Jean-Marie
• Lafferty, Walter
• Grzywacz, Robert
• Daunt, Stephen J.

Issue Date

2018-06-20

Keyword(s)

Small molecules

Abstract

Only old IR and no MW data exist for this molecule.a Last year we reported (2017 ISMS, TK08) on the ν20 (B1) A-type band recorded in CLS Cycle 23 (Jan-May, 2016). This was the only band with easily assignable lines. Other bands were perturbed and not assignable at present. We assigned most of ν20 and rotational constants were determined for this molecule. Our ν20 data was limited in K and J values due to the pressure used and time limitations in that cycle. Also some small torsional perturbations may have affected the derived constants. From our recent studies ν9 bands appear unperturbed for the other 13C and D isotopologues. Therefore we recorded that band for 2,2-D2-Propane in the Far-IR at higher pressures in new experiments. The spectrum of the ν9 (A1) band (CCC bend) was recorded on the Far-IR beamline during CLS Cycle 27 (Jun-Dec, 2017). Spectra were recorded at 4.055 Torr (∆ν = 0.00096 cm-1) and 7.691 Torr (∆ν = 0.0020 cm-1) to see higher K and J transitions. An optical path of 72 m and a cell temperature of 265.75K were used. We assigned over 5900 lines with both traditional methods and the aid of the PGOPHER program of Colin Western.b Lines up to K = 37 and J = 55 were assigned by using both pressure data sets. Improved rotational constants including the inertial and centrifugal distortional constants will be reported. This varied isotopic data should improve the r0 structure.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100543

DOI

10.15278/isms.2018.WH11

Copyright and License Information

Copyright 2018 Daniel Gjuraj

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