Theoretical exploration of femtosecond multi-state nuclear dynamics of small clusters
- We investigate ultrafast multi-state nuclear dynamics in a triatomic cluster. In particular, we explore how the intracluster nuclear dynamics of the Ag−3/Ag3/Ag+3 system is reflected in the femtosecond pump-probe negative ion-to neutral-to positive ion (NENEPO) signals. The nuclear dynamics is based on classical trajectories on the ground electronic adiabatic state potential hypersurfaces obtained from accurate ab initio quantum chemistry calculations. The nuclear dynamics of Ag3 initiated from the linear transition state involves distinct sequential processes of configurational relaxation to the triangular configuration, intracluster collisions, and the onset of IVR, resonant, and dissipative IVR, and vibrational equilibration. We determined the timescales for these processes and discussed their dependence on the initial cluster temperature. The Wigner representation of the density matrix was utilized to simulate the NENEPO-zero kinetic energy (NENEPO-ZEKE) signal and the total (integrated over the photoelectron energy) NENEPOWe investigate ultrafast multi-state nuclear dynamics in a triatomic cluster. In particular, we explore how the intracluster nuclear dynamics of the Ag−3/Ag3/Ag+3 system is reflected in the femtosecond pump-probe negative ion-to neutral-to positive ion (NENEPO) signals. The nuclear dynamics is based on classical trajectories on the ground electronic adiabatic state potential hypersurfaces obtained from accurate ab initio quantum chemistry calculations. The nuclear dynamics of Ag3 initiated from the linear transition state involves distinct sequential processes of configurational relaxation to the triangular configuration, intracluster collisions, and the onset of IVR, resonant, and dissipative IVR, and vibrational equilibration. We determined the timescales for these processes and discussed their dependence on the initial cluster temperature. The Wigner representation of the density matrix was utilized to simulate the NENEPO-zero kinetic energy (NENEPO-ZEKE) signal and the total (integrated over the photoelectron energy) NENEPO signal. We show how geometrical change, completion of IVR and vibrational coherenceeffects can be identified in the NENEPO signals. A comparison of the calculated NENEPO signals with the available experimental data is presented.…
Author: | Prof. Dr. Michael Hartmann, Jiřı́ Pittner, Vlasta Bonačić-Koutecký, Andreas Heidenreich, Joshua Jortner |
---|---|
Parent Title (English): | The Journal of Chemical Physics |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2014/07/03 |
Year of first Publication: | 1998 |
Publishing Institution: | SRH Berlin University of Applied Sciences |
Release Date: | 2014/07/03 |
Tag: | Cluster dynamics; Femtosecond dynamics |
Volume: | 108 |
Issue: | 8 |
First Page: | 3096 |
Last Page: | 3113 |
Note: | Volltext aus urheberrechtlichen Gründen nicht verfügbar. Fulltext due to copyright not available. |
Link author profile: | http://www.srh-hochschule-berlin.de/de/unsere-hochschule/professoren/detailansicht/team/michael-hartmann/ |
Peer-reviewed: | Keine Angabe - No details |
JEL-Classification: | Y Miscellaneous Categories |
Licence (German): | ![]() |