Single-hole one-electron superexcited states and doubly-excited states of molecules as studied by coincident electron-energy-loss spectroscopy

Takeshi Odagiri, Hironobu Fukuzawa, Ken Takahashi, Noriyuki Kouchi, Yoshihiko Hatano

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The single-hole one-electron superexcited states and doubly-excited states of H2, D2, N2 and O2 have been investigated by means of the coincident electron-energy-loss spectroscopy that we developed. In this method the electron-energy-loss spectra tagged with the vacuum ultraviolet fluorescences emitted by the neutral fragments produced from superexcited molecules are measured by means of electron-photon coincidence technique. The contribution from ionization in this sort of electron-energy-loss spectra is suppressed to a large extent, and thus the structures attributed to the superexcited states of molecules become highlighted. The comparison with the photoexcitation experiments by means of the oscillator strengths give us clear discrimination between allowed and forbidden superexcited-states. As to H2, D2, and N2, the doubly-excited states including those found in the present experiment have been investigated in terms of both their energies and dynamical behavior. A new possibility of the coincident electron-energy-loss spectroscopy has been established in investigating the single-hole one-electron superexcited states of O2: the time-resolved coincident electron-energy-loss spectrum has been measured to distinguish between the direct process producing excited oxygen atoms and indirect one due to cascade transition. It has turned out that the coincident electron-energy-loss spectroscopy is a key tool for investigating superexcited molecules.

Original languageEnglish
Pages (from-to)95-102
Number of pages8
JournalNukleonika
Volume48
Issue number2
Publication statusPublished - 2003
Externally publishedYes

Keywords

  • Doubly-excited molecule
  • Electron-energy-loss spectroscopy
  • H
  • N
  • O
  • Superexcited molecule

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Instrumentation
  • Safety, Risk, Reliability and Quality
  • Condensed Matter Physics
  • Waste Management and Disposal

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