Doubly Excited Resonances in Molecular Hydrogen――An Outstanding Problem of the Simplest Molecule

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Other Title
  • 水素分子の2電子励起共鳴――未だに解けない基本の問題(最近の研究から)
  • 最近の研究から 水素分子の2電子励起共鳴--未だに解けない基本の問題
  • サイキン ノ ケンキュウ カラ スイソ ブンシ ノ 2 デンシレイキキョウメイ イマダ ニ トケナイ キホン ノ モンダイ

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Abstract

Formation and decay of molecular doubly excited resonances is a challenging subject in molecular physics since the Born-Oppenheimer approximation and mean field approximation are not valid. We succeeded in observing the doubly excited resonances in electron-H_2 collisions by means of coincident electronenergy-loss spectroscopy. A newly found doubly excited state 'F' was proposed to substantiate a peak around 26eV. However such state has not yet been obtained theoretically. In order to understand the dynamics of the doubly excited H_2 in more detail we have recently carried out the (γ, 2γ) coincidence experiment on H_2. It has been found that a semiclassical approximation describes well the dynamics of the Q_2^1П_u(1) state of H_2. The origin of the 26eV peak, however, remains an open and tough question.

Journal

  • Butsuri

    Butsuri 61 (9), 671-675, 2006-09-05

    The Physical Society of Japan

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