Butsuri
Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181
Current Progress in the Study of Excitation Dynamics in Atoms and Molecules by Very-Low- to Low-Energy (10μeV~10eV) Electron Impact
Masashi KitajimaHiroshi Tanaka
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2009 Volume 64 Issue 10 Pages 742-751

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Abstract

The subject of low energy electron-molecule scattering in the gas phase under single collision conditions is briefly reviewed. First, the Laser Photoelectron Attachment method that has been successfully applied in a number of high resolution studies in the energy range from 〜μeV to less than one eV is discussed. With this method threshold behavior of the attachment process has been clarified for SF_6^-/SF_6 and Cl^-/Cl_2 and cusp structure and vibrarional Feshbach resonance have been observed at the excitation threshold. We then turn to discuss the use of synchrotron photoionization sources for the study of "cold" electron-molecule collisions and results are reported for in the energy range from few meV to about 200meV. For this method we discuss the case of non-polar and polar molecules, where the enhancement of the non-polar cross section with decreasing impact energy is due to virtual states. Finally, recent results of "high resolution" electron-molecule scattering experiments below 10eV are summarized and are also discussed in conjunction with the thermally excited molecule target.

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© 2009 The Physical Society of Japan
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