Production processes of excited hydrogen (H and D) by electron impacts

By the collision of molecules with electrons, the molecules are excited easily to the state of high excitation above10 eV. As the result, the excited hydrogen atoms formed by the electron impact dissociation of the molecules containing hydrogen atoms have large translation energy, and the Balmer line has large Doppler width. In order to determine the anisotropy and orientation of spatial distribution and the magnetic quantum number distribution of the excited hydrogen atoms formed by the electron impact of H2 and D2, the author devised the methods of measurement and analysis of various Doppler profiles, and elucidated the dynamics of the dissociation of hydrogen molecules in high excitation state by electron impact. The research on the orientation quantum number distribution of the dissociated atoms by pulsed electron impact is reported, in which the Balmer beta line formed from H2 by pulsed electron beam impact was measured by time separation. The polarized light emission of the excited hydrogen atoms formed by the electron impact of H2 and D2 was measured, and the degree of polarization was separated for each component. (K.I.)