TY - JOUR
T1 - Penning ionization electron spectroscopy of van der Waals clusters
AU - Ohno, Koichi
AU - Tanaka, Hideyasu
AU - Yamakita, Yoshihiro
AU - Maruyama, Ryo
AU - Horio, Takuya
AU - Misaizu, Fuminori
N1 - Funding Information:
This work was supported by a Grant in Aid for Scientific Research from the Japanese Ministry of Education, Science, Sports and Culture. H. Tanaka is supported by the Research Fellowship of the Japan Society for the Promotion of Science for Young Scientists. F. Misaizu acknowledges financial supports from the Sumitomo Foundation and the Kurata Foundation. F. Misaizu and Y. Yamakita acknowledge the financial support from the Mitsubishi Foundation.
PY - 2000/11
Y1 - 2000/11
N2 - A magnetic bottle electron spectrometer with retarding electrodes has been applied to observation of Penning ionization electron spectra (PIES) of van der Waals clusters. Considerably increased efficiency of the spectrometer by 1000 times over the conventional PIES apparatus enabled us to measure electron spectra of van der Waals clusters of rare gas atoms in collisions with metastable atoms, He*(23S) and Ne*(33P). Unusually fast electrons with extra kinetic energies of 1-2 eV as compared to those expected for vertical ionization have been detected for Ar and Kr van der Waals clusters in collisions with He*(23S). These fast electrons are ascribed to autoionization into stable ionic structures via superexcited states embedded in the ionization continua, and the unusual electrons can be considered to be related to an adiabatically ionized state to which a direct ionization process is almost forbidden because of a very small Franck-Condon factor.
AB - A magnetic bottle electron spectrometer with retarding electrodes has been applied to observation of Penning ionization electron spectra (PIES) of van der Waals clusters. Considerably increased efficiency of the spectrometer by 1000 times over the conventional PIES apparatus enabled us to measure electron spectra of van der Waals clusters of rare gas atoms in collisions with metastable atoms, He*(23S) and Ne*(33P). Unusually fast electrons with extra kinetic energies of 1-2 eV as compared to those expected for vertical ionization have been detected for Ar and Kr van der Waals clusters in collisions with He*(23S). These fast electrons are ascribed to autoionization into stable ionic structures via superexcited states embedded in the ionization continua, and the unusual electrons can be considered to be related to an adiabatically ionized state to which a direct ionization process is almost forbidden because of a very small Franck-Condon factor.
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U2 - 10.1016/S0368-2048(00)00206-1
DO - 10.1016/S0368-2048(00)00206-1
M3 - Article
AN - SCOPUS:0034323307
SN - 0368-2048
VL - 112
SP - 115
EP - 128
JO - Journal of Electron Spectroscopy and Related Phenomena
JF - Journal of Electron Spectroscopy and Related Phenomena
IS - 1-3
ER -