Double charge transfer spectroscopy of acetylene dication C2H22+at vibrational resolution

  • Furuhashi O
  • Kinugawa T
  • Masuda S
 et al. 
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Abstract

We have observed a vibrational progression of C2H22+with double charge transfer (DCT) spectroscopy. From an exploratory calculation, the progression is assigned to the symmetric C-C stretching mode of the lowest singlet1Δgstate with linear geometry. The observed structure is well reproduced with the theoretical Franck-Condon (FC) factors obtained from the potential curves of the1Δgand first-excited1Σg+states along the normal C-C stretching coordinate. Multi-reference CI calculations reveal a predominant contribution of the1Δgstate. These results suggest that the DCT process can probe dicationic states of polyatomic molecules like acetylene with resort to the FC principle. © 2001 Elsevier Science B.V.

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Authors

  • Osamu Furuhashi

  • Tohru Kinugawa

  • Suomi Masuda

  • Chikashi Yamada

  • Shunsuke Ohtani

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