Real-time detection of S(1D2) photofragments produced from the 1B2(1Σu+) state of CS2 by vacuum ultraviolet photoelectron imaging using 133 nm probe pulses

Takuya Horio, Roman Spesyvtsev, Yu Furumido, Toshinori Suzuki

Research output: Contribution to journalArticle

6 Citations (Scopus)
23 Downloads (Pure)

Abstract

Ultrafast photodissociation dynamics from the 1B2(1Σu+) state of CS2 are studied by time-resolved photoelectron imaging using the fourth (4ω, 198 nm) and sixth (6ω, 133 nm) harmonics of a femtosecond Ti:sapphire laser. The 1B2 state of CS2 was prepared with the 4ω pulses, and subsequent dynamics were probed using the 6ω vacuum ultraviolet (VUV) pulses. The VUV pulses enabled real-time detection of S(1D2) photofragments, produced via CS2*(1B2(1Σu+)) → CS(X 1Σ+) + S(1D2). The photoionization signal of dissociating CS2*(1B2(1Σu+)) molecules starts to decrease at about 100 fs, while the S(1D2) fragments appear with a finite (ca. 400 fs) delay time after the pump pulse. Also discussed is the configuration interaction of the 1B2(1Σu+) state based on relative photoionization cross-sections to different cationic states.
Original languageEnglish
Article number013932
Number of pages6
JournalJournal of Chemical Physics
Volume147
Issue number1
Early online date9 May 2017
DOIs
Publication statusPublished - 7 Jul 2017

Keywords

  • photodissociation dynamics
  • photoelectron spectroscopy
  • pump-probe experiments
  • carbon disulphide
  • photoelectron imaging
  • photoionization
  • vacuum
  • ultraviolet
  • photfragmnets
  • photoabsorption spectrum

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