Phys. Rev. A 104, 043114 (2021)
IR-photon quenching of delayed electron detachment from hot pentacene anions
S. Iida1, S. Kuma2, M. Kuriyama1, T. Furukawa3, M. Kusunoki3, H. Tanuma1, K. Hansen4, H. Shiromaru5 and T. Azuma2,1,*
1 Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
2 Atomic, Molecular and Optical Physics Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
3 Department of Physics, Toho University, Funabashi, Chiba 274-8510, Japan
4 Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, Tianjin 300072, China
5 Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
* toshiyuki-azuma@riken.jp
Abstract
Spontaneous and photoinduced delayed electron detachment from pentacene anions was measured in the electrostatic ion storage ring TMU E-ring. The dissipation mechanisms of the internal energy of the stored hot ions were inferred both from the temporal profile of the spontaneous detachment and from the laser-firing time dependence of the photoinduced temporal profile. Simulations based on statistical emission processes reproduced the observed behaviors, providing the value for the radiative cooling rates in the time range of a few tens of milliseconds. Using the obtained information on the competition between electron detachment and radiative cooling, we discuss the anion survival probabilities as a function of the initial internal energies and the nature of the observed quasiexponential decrease in the temporal profile of the spontaneous detachment at long times.
