Involvement of a low-lying Rydberg state in the ultrafast relaxation dynamics of ethylene

Elio G. Champenois, Niranjan H. Shivaram, Travis W. Wright, Chan Shan Yang, Ali Belkacem, James P. Cryan

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33 Citations (Scopus)


We present a measurement of the time-resolved photoelectron kinetic energy spectrum of ethylene using 156 nm and 260 nm laser pulses. The 156 nm pulse first excites ethylene to the 1B1u (ππ∗) electronic state where 260 nm light photoionizes the system to probe the relaxation dynamics with sub-30 fs resolution. Recent ab initio calculations by Mori et al. [J. Phys. Chem. A 116, 2808-2818 (2012)] have predicted an ultrafast population transfer from the initially excited state to a low-lying Rydberg state during the relaxation of photoexcited ethylene. The measured photoelectron kinetic energy spectrum reveals wave packet motion on the valence state and shows indications that the low-lying π3s Rydberg state is indeed transiently populated via internal conversion following excitation to the ππ∗ state, supporting the theoretical predictions.

Original languageEnglish
Article number014303
JournalJournal of Chemical Physics
Issue number1
Publication statusPublished - 2016 Jan 7
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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