Dissociation dynamics of CH4+ core ion in the 2A1 state

Kenji Furuya, Katsumi Kimura, Yasuhiro Sakai, Toshinobu Takayanagi, Nobuaki Yonekura

研究成果: Contribution to journalArticle査読

27 被引用数 (Scopus)


Threshold-photoelectron photoion coincidence (TPEPICO) spectra of CH 4 have been observed with synchrotron radiation at the excitation to the 2A1 (v1=0-3) ionic states as well as to the 4pt2 Rydberg (v1 =0-4) states. In all the TPEPICO .spectra observed, the CH3+ band shape was almost rectangular, which suggests that the translational and internal energy distributions of CH3+ are very narrow. The total kinetic energy releases (KERs) have been estimated from the CH3+ band shape. As a result, it was found that the CH3+ species were in an electronically excited state. There was a narrow distribution of the total KERs and similarity in the TPEPICO CH3+ band shapes between the spectra at the 2A1 ionic state and the 4pt2 Rydberg state excitations, which led to the conclusion that the Rydberg electron is just a spectator and the dissociation of the core ion plays an important role in dissociation through the 4pt2 Rydberg state. Similar results have also been obtained for CH2+ and CH+. productions. However, on the other hand, an H+ fragment has been observed only at the 2A1 state excitation. It showed a band with a long tail in the slower flight time region. The total average KERs and the decay rates have been estimated from band shape simulation. From these results, it has been found that a dissociation limit of the H+ ion exists just below the 2A1 ionic state. The dissociation mechanisms through the 4pt2 Rydberg state have been discussed in detail in comparison with those of the 2A 1 ionic state.

ジャーナルThe Journal of Chemical Physics
出版ステータス出版済み - 1994

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)
  • 物理化学および理論化学


「Dissociation dynamics of CH<sub>4</sub><sup>+</sup> core ion in the <sup>2</sup>A<sub>1</sub> state」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。