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Variable angle electron-impact excitation of nitromethane

Flicker, Wayne M. and Mosher, Oren A. and Kuppermann, Aron (1980) Variable angle electron-impact excitation of nitromethane. Journal of Chemical Physics, 72 (4). pp. 2788-2794. ISSN 0021-9606. doi:10.1063/1.439427.

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The electron-impact excitation of nitromethane has been studied at incident electron energies of 25, 55, and 90 eV, at scattering angles from 6° to 80°. The lowest-lying inelastic process which is observed is a previously unreported feature with a maximum intensity at 3.8 eV energy loss. This feature represents at least one singlettriplet transition. It is likely that this 3.8 eV triplet feature plays a central role in the gas phase photolysis of nitromethane. A weak inelastic process with a peak at 4.45 eV has also been observed, as has a strong transition at 6.23 eV. Both of these excitations are well known from optical spectra, and they are generally believed to represent spin-allowed n→π* and π→π* transitions, respectively. Their assignments are discussed in detail. In addition, seven other transitions, several of which have not been reported previously, have been detected in the 7–12 eV energy-loss range. Three of these transitions, at 8.3, 8.85, and 11.73 eV energy loss, are tentatively assigned to Rydberg excitations of increasingly tightly bound electrons into a 3s Rydberg orbital.

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Additional Information:© 1980 American Institute of Physics. Received 13 March 1979; accepted 11 April 1979. This work was supported in part by a contract (No. EY-76-S-03-767) from the Department of Energy. Report Code: CALT-767P4-162. Work performed [by W.M.F.] in partial fulfillment of the requirements for the Ph.D. degree in Chemistry at the California Institute of Technology. Arthur Amos Noyes Laboratory of Chemical Physics, Contribution No. 5987.
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Department of EnergyEY-76-S-03-767
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Arthur Amos Noyes Laboratory of Chemical Physics5987
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ID Code:11986
Deposited By: Tony Diaz
Deposited On:21 Oct 2008 03:04
Last Modified:08 Nov 2021 22:23

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