Vibrational excitation of $CH_{4}$by electron impact: 3-20 eV

Content Provider	Scilit
Author	Tanaka, H. Kubo, M. Onodera, N. Suzuki, A.
Copyright Year	1983
Description	Journal: Journal of Physics B: Atomic and Molecular Physics Differential cross sections (DCS) for the vibrational excitations ( nu$ _{2,4}$, 170 meV; nu$ _{1,3}$, 360 meV) of $CH_{4}$ by electron impact have been investigated for incident energies of 3 to 20 eV in the range of 30 to 140 degrees using a crossed-beam apparatus. Integral and momentum transfer cross sections are calculated from the DCS. At about 7.5 eV, the angular distribution shows d-wave behaviour, and the integral cross sections are enhanced to about $10^{-16}$ $cm^{2}$. The parameters of angular correlation theory with the irreducible tensor method for the $T_{2}$ molecular symmetry of $CH_{4}$ were obtained by fitting. It was found that the d wave alone suffices to explain the angular distributions due to the presence of a broad resonant excitation process in the nu$ _{2,4}$ and nu$ _{1,3}$ channels. At incident energies of 10 to 20 eV, the angular distributions are isotropic within the experimental error. At lower energies of 3 to 5 eV, the distributions are practically constant within the angular range of 40 to 140 degrees , but the cross sections continuously increase towards smaller angles.
Related Links	http://iopscience.iop.org/article/10.1088/0022-3700/16/15/026/pdf
Ending Page	2869
Page Count	9
Starting Page	2861
ISSN	00223700
DOI	10.1088/0022-3700/16/15/026
Journal	Journal of Physics B: Atomic and Molecular Physics
Issue Number	15
Volume Number	16
Language	English
Publisher	IOP Publishing
Publisher Date	1983-08-14
Access Restriction	Open
Subject Keyword	Journal: Journal of Physics B: Atomic and Molecular Physics Atomic, Molecular and Chemical Physics Energy Dissipation Momentum Transfer
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics