Investigation of electronically excited indole relaxation dynamics via photoionization and fragmentation pump-probe spectroscopy T. J. Godfrey, Hui Yu, and Susanne Ullrich Citation: The Journal of Chemical Physics 141, 044314 (2014); doi: 10.1063/1.4890875 View online: http://dx.doi.org/10.1063/1.4890875 View Table of Contents: http://scitation.aip.org/content/aip/journal/jcp/141/4?ver=pdfcov Published by the AIP Publishing Articles you may be interested in Revisiting the relaxation dynamics of isolated pyrrole J. Chem. Phys. 141, 014303 (2014); 10.1063/1.4885722 Excited state dynamics in SO2. I. Bound state relaxation studied by time-resolved photoelectron-photoion coincidence spectroscopy J. Chem. Phys. 140, 204301 (2014); 10.1063/1.4875035 MODE-specific deactivation of adenine at the singlet excited states J. Chem. Phys. 139, 124311 (2013); 10.1063/1.4821830 Pump-probe spectroscopy of molecules driven by infrared field in both ground and excited electronic states J. Chem. Phys. 125, 204313 (2006); 10.1063/1.2393234 Ultrafast excited-state dynamics in photochromic N-salicylideneaniline studied by femtosecond time-resolved REMPI spectroscopy J. Chem. Phys. 121, 9436 (2004); 10.1063/1.1801991
This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP: 130.160.4.77 On: Sat, 20 Dec 2014 11:17:44
THE JOURNAL OF CHEMICAL PHYSICS 141, 044314 (2014)
Investigation of electronically excited indole relaxation dynamics via photoionization and fragmentation pump-probe spectroscopy T. J. Godfrey, Hui Yu, and Susanne Ullricha) Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602, USA
(Received 11 June 2014; accepted 10 July 2014; published online 31 July 2014) The studies herein investigate the involvement of the low-lying 1 La and 1 Lb states with 1 π π ∗ character and the 1 π σ ∗ state in the deactivation process of indole following photoexcitation at 201 nm. Three gas-phase, pump-probe spectroscopic techniques are employed: (1) Time-resolved photoelectron spectroscopy (TR-PES), (2) hydrogen atom (H-atom) time-resolved kinetic energy release (TRKER), and (3) time-resolved ion yield (TR-IY). Each technique provides complementary information specific to the photophysical processes in the indole molecule. In conjunction, a thorough examination of the electronically excited states in the relaxation process, with particular focus on the involvement of the 1 π σ ∗ state, is afforded. Through an extensive analysis of the TR-PES data presented here, it is deduced that the initial excitation of the 1 Bb state decays to the 1 La state on a timescale beyond the resolution of the current experimental setup. Relaxation proceeds on the 1 La state with an ultrafast decay constant (
This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP: 130.160.4.77 On: Sat, 20 Dec 2014 11:17:44
THE JOURNAL OF CHEMICAL PHYSICS 141, 044314 (2014)
Investigation of electronically excited indole relaxation dynamics via photoionization and fragmentation pump-probe spectroscopy T. J. Godfrey, Hui Yu, and Susanne Ullricha) Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602, USA
(Received 11 June 2014; accepted 10 July 2014; published online 31 July 2014) The studies herein investigate the involvement of the low-lying 1 La and 1 Lb states with 1 π π ∗ character and the 1 π σ ∗ state in the deactivation process of indole following photoexcitation at 201 nm. Three gas-phase, pump-probe spectroscopic techniques are employed: (1) Time-resolved photoelectron spectroscopy (TR-PES), (2) hydrogen atom (H-atom) time-resolved kinetic energy release (TRKER), and (3) time-resolved ion yield (TR-IY). Each technique provides complementary information specific to the photophysical processes in the indole molecule. In conjunction, a thorough examination of the electronically excited states in the relaxation process, with particular focus on the involvement of the 1 π σ ∗ state, is afforded. Through an extensive analysis of the TR-PES data presented here, it is deduced that the initial excitation of the 1 Bb state decays to the 1 La state on a timescale beyond the resolution of the current experimental setup. Relaxation proceeds on the 1 La state with an ultrafast decay constant (
