Collision energy‐resolved Penning ionization electron spectra of unsaturated hydrocarbons with He*(2 3S) metastable atoms

Collision energy dependencies of the partial ionization cross sections of ethylene, propene, butadiene, and benzene upon collision with He*(2 3S) metastable atoms were measured. Band intensities of the π bands decrease with the increase of the collision energy. This tendency indicates that interaction potentials are attractive when He*(2 3S) approaches the π orbitals of unsaturated hydrocarbons. The intensity of a strong extra band at an electron energy of 3.7 eV for benzene shows a similar collision‐energy dependence with those of π bands. This extra band is assigned to the ionization from the π(1e1g) orbitals associated with the excitation from the π(1e1g) orbitals to the π*(1e2u) orbitals. The reason why the extra band of the Penning ionization electron spectrum of benzene is more enhanced than that of the ultraviolet photoelectron spectrum can be ascribed to the existence of the He*(2 3S) atom at the time the ionization occurs. The shapes of the σ and π bands change with the collision energy, which re...

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