Ultrafast charge transfer dynamics in the excited state of DCM measured by a 6-fs UV pulse laser

Sena Hashimoto, Rikako Takagi, Kotaro Okamura, Atsushi Yabushita, Takayoshi Kobayashi, Izumi Iwakura*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The photoexcited dynamics of a laser dye, 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM), in an acetonitrile solution and a dimethyl sulfoxide (DMSO) solution were studied by pump–probe spectroscopy with a 6-fs ultraviolet laser. UV light excites the DCM solved in any of acetonitrile or DMSO into locally excited (LE) state (via S0→S2 excitation), then the LE state relaxes to a charge transfer state. In the previous study, the mechanism of transition from the LE state to the intramolecular charge transfer (ICT) state was not clear just known to proceed faster than 100 fs. Our present work has clarified the primary process determining the time constant (LE→ICT state) to be 50 fs. Spectral analysis of the transient difference-absorption spectrum has shown that the locally excited state has a stimulated emission peak at 2.9 eV.

Original languageEnglish
Article number111326
JournalChemical Physics
Volume551
DOIs
StatePublished - 1 Nov 2021

Keywords

  • DCM
  • Intramolecular charge transfer
  • Pump-probe spectroscopy
  • Ultrashort UV pulse laser

Fingerprint

Dive into the research topics of 'Ultrafast charge transfer dynamics in the excited state of DCM measured by a 6-fs UV pulse laser'. Together they form a unique fingerprint.

Cite this