Nuclear coordinate dependence of electronic wave function studied by high-resolution electron momentum spectroscopy

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In this study, in order to investigate correlation between nuclear and electron motions in a molecule, we have developed a high-resolution electron momentum spectroscopy that would be capable of measuring nuclear coordinate dependent electronic wave functions. As a result, the resolution of electron binding energy has been improved from 2.7 eV to 1.1 eV by improving energy resolution of an electron analyzer incorporated with a monochromatized incident electron beam. To achieve higher resolution, it is found to be fundamental to develop a new electron analyzer with reduced aberrations and advanced electron optics as well as to introduce highly stable voltage supplies.