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Electron‐impact spectroscopy of the alkynes: A comparison of propyne and 1‐butyne with acetylene

Flicker, Wayne M. and Mosher, Oren A. and Kuppermann, Aron (1978) Electron‐impact spectroscopy of the alkynes: A comparison of propyne and 1‐butyne with acetylene. Journal of Chemical Physics, 69 (7). pp. 3311-3320. ISSN 0021-9606. doi:10.1063/1.436984.

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The electronic excitation spectra of propyne and 1‐butyne have been investigated by the method of variable angle electron‐impact spectroscopy. In both molecules, two singlet→triplet transitions were observed with maximum intensities at 5.2 and 5.8_(5) eV. No evidence was found for the existence of any transitions with vertical excitation energy below 5 eV. A number of previously unreported transitions to superexcited states in both propyne and 1‐butyne were detected. The relationship of these spectra to those of acetylene is discussed, and the different behavior of valence and Rydberg transition energies in response to alkyl substitution is explained qualitatively in terms of the different excited state charge distributions.

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Additional Information:© 1978 American Institute of Physics. Received 20 February 1978. This work was supported in part by a contract (EY -76-S-03- 767) from the Department of Energy, Report Code: CALT- 767P4-l56. Work performed in partial fulfillment of the requirements for the Ph.D. degree in Chemistry at the California Institute of Technology.
Funding AgencyGrant Number
Department of Energy (DOE)EY-76-S-03-767
Subject Keywords:excitation; propyne; acetylene; alkynes; electron−molecule collisions; energy−level transitions; charge distribution; excited states
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Other Numbering System NameOther Numbering System ID
CALTCALT- 767P4-l56
Issue or Number:7
Classification Code:PACS: 34.80.Gs
Record Number:CaltechAUTHORS:20120726-100000201
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Official Citation:Electron-impact spectroscopy of the alkynes: A comparison of propyne and 1-butyne with acetylene Wayne M. Flicker, Oren A. Mosher, and Aron Kuppermann, J. Chem. Phys. 69, 3311 (1978), DOI:10.1063/1.436984
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32742
Deposited On:26 Jul 2012 23:31
Last Modified:09 Nov 2021 21:29

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