Infrared spectra of acetylene dimers and acetylene-nitrogen: (DCCD) 2, H-bonded DCCD-HCCH, and DCCD-NN in the 4.1 μm region

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DOIResolve DOI: http://doi.org/10.1016/j.jms.2011.05.010
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TypeArticle
Journal titleJournal of Molecular Spectroscopy
ISSN0022-2852
Volume269
Issue1
Pages124128; # of pages: 5
SubjectC <sub>2</sub>D <sub>2</sub>-N <sub>2</sub> complex; H-bonded; Infrared spectrum; Rotational constants; Spectrum; Sub-bands; Supersonic jets; Tunable diode lasers; Tunneling splittings; Van der waals; Vibrational excitation; Acetylene; Dimers; Infrared radiation; Lighting; Spectroscopy; Supersonic aerodynamics; Van der Waals forces; Vibration analysis; Excited states
AbstractInfrared spectra of the weakly-bound T-shaped acetylene dimers DCCD-DCCD and DCCD-HCCH are studied in the region of the DCCD ν 3 fundamental (∼2440 cm -1) using a pulsed supersonic slit-jet expansion and a tunable diode laser probe. The K a = 0 ← 1 and 1 ← 0 subbands, corresponding to the vibration of the DCCD monomer at the "top" of the T, are analyzed. Compared to the analogous spectrum of HCCH-HCCH, the present results are much less perturbed. The tunneling splitting for (DCCD) 2 in the excited state is determined to be 141 MHz, a big reduction from the previously determined ground state value of 424 MHz. The dimer A rotational constants show a large apparent increase upon vibrational excitation, and we discuss whether this increase is real. The linear DCCD-NN complex is also observed as an impurity in the spectrum, and it too is found to be unperturbed, in contrast with HCCH-NN. © 2011 Elsevier Inc. All rights reserved.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Steacie Institute for Molecular Sciences (SIMS-ISSM)
Peer reviewedYes
NPARC number21271446
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Record identifierb35302ca-821f-44e7-a033-65d36ff29824
Record created2014-03-24
Record modified2016-05-09
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