Two-dimensional Penning ionization electron spectroscopic study on outer characteristics of molecules

Collision-Energy-Resolved Penning Ionization Electron Spectroscopy of Phenylacetylene and Diphenylacetylene by Collision with He*(23S) Metastable Atoms

“…Structurally, a phenylacetylene molecule contains two parts: a phenyl group and an acetylene group. Interactions with He*(2 3 S) for both parts have already been investigated separately. ,− The main attention in this paper is paid to these components. Their contribution to the total interaction with He*(2 3 S)/Li(2 2 S) can be illustrated by the model potential calculation (Figure a).…”

“…In PIES, the reactivity of valence MOs can be examined with the EED model calculations depending on the dihedral angles around the C⋮C bond of diphenylacetylene. It would be interesting to obtain information on the electronic structure of π conjugated compounds as well as anisotropic interaction around the phenyl groups and the C⋮C triple bond compared with related compounds such as benzene, acetylene, biphenyl, etc. ,− …”

“…It would be interesting to obtain information on the electronic structure of π conjugated compounds as well as anisotropic interaction around the phenyl groups and the Ct C triple bond compared with related compounds such as benzene, acetylene, biphenyl, etc. 28,[43][44][45][46]…”

Long-range interactions of excited He atoms with the alkaline earth atoms Mg, Ca, and Sr

“…For the calculations, reliable model potentials are important as they directly impact on the accuracy of estimated collision characteristics such as the total ionization cross sections and their collisional-energy dependence. For the case of the deexcitation of optically allowed excited atoms such as He(2 1 P), Ne[2p 5 the long-range parts of the potentials are much stronger than for the case of the deexcitation of metastable atoms. The longrange interaction between the involved atoms or molecules determines the rate coefficient for close collisions so that it has an important influence on the rate coefficient for Penning ionization.…”

“…1 Furthermore, metastable atom electron spectroscopy is a powerful technique widely used to study the electronic characteristics of various surfaces and interfaces. [2][3][4][5][6] The basic principles of this technique are that a slow, long-lived, rare gas metastable atom is introduced onto a surface of condensed matter, where most of its excitation energy is used to eject electrons from the surface, and that the resultant spectrum of ejected electrons describes the electronic state of the surface.…”