Time-resolved study of vacuum ultraviolet excited state dynamics in pyrrole using 160 nm femtosecond laser pulses generated by four-wave mixing in argon
Abstract
We have successfully utilized noncollinear four-wave mixing in argon to generate ∼160 nm femtosecond laser pulses, which can serve as the vacuum ultraviolet pump laser for time-resolved measurements. By performing a femtosecond time-resolved photoelectron imaging experiment, the ultrafast decay dynamics of pyrrole following single-photon excitation at ∼160 nm is investigated. Two time constants of 50−12+17 and 250±50 fs are derived based on the analysis of the time-resolved photoelectron spectroscopy spectra and assigned to the excited-state lifetimes of high-lying valence and Rydberg states. In particular, the analysis of the photoelectron angular distributions clearly indicates that the initially prepared valence ππ* state(s) should be of mixed valence/Rydberg character.
Fields of Study & Subjects
Laser-Matter Interactions and Applications
Spectroscopy and Quantum Chemical Studies
Quantum optics and atomic interactions
Publication details
- Journal / source
- Chinese Journal of Chemical Physics
- Publisher
- AIP Publishing
- Volume
- 39
- Issue
- 4
- Pages
- 464–470
- Publication date
- 4 March 2026
- Language
- EN