A wavelength dependent investigation of the indole photophysics via ionization and fragmentation pump-probe spectroscopies

Physical Chemistry Chemical Physics : PCCP
T J GodfreySusanne Ullrich

Abstract

A wavelength dependent study investigating the low-lying (1)La and (1)Lb states, both possessing (1)ππ* character, and the (1)πσ* state in the deactivation process of indole is presented here. Relaxation dynamics following excitation at 241, 250, 260, 270, 273, and 282 nm are examined using three gas-phase, pump-probe spectroscopic techniques: (1) hydrogen atom (H-atom) time-resolved kinetic energy release (TR-KER), (2) time-resolved photoelectron spectroscopy (TR-PES), and (3) time-resolved ion yield (TR-IY). Applied in combination, a more complete picture of the indole relaxation dynamics may be gleaned. For instance, TR-PES experiments directly observe all relaxation pathways by probing the evolution of the excited states following photoexcitation; whereas, TR-KER measurements indirectly, yet specifically, probe for (1)πσ*-state activity through the detection of H-atoms eliminated along the indole nitrogen-hydrogen (N-H) stretch coordinate-a possible outcome of (1)πσ*-state relaxation in indole. In addition, mass information obtained via TR-IY monitors fragmentation dynamics that may occur within the neutral electronically excited and/or cationic states. The work herein assesses the onset and importance of the (1)πσ* state a...Continue Reading

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Citations

Sep 24, 2015·Physical Chemistry Chemical Physics : PCCP·Magdalena M ZawadzkiDave Townsend
Mar 8, 2017·The Journal of Physical Chemistry. a·David E CouchWilliam K Peters
Apr 21, 2017·Physical Chemistry Chemical Physics : PCCP·Maciej J NowakLeszek Lapinski
Nov 23, 2017·The Journal of Chemical Physics·Igor RevaMaciej J Nowak
Sep 7, 2017·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Trevor M SafkoRichard G Weiss
Nov 6, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Sebastian MaiSusanne Ullrich
Jul 22, 2018·Physical Chemistry Chemical Physics : PCCP·Thomas KierspelJochen Küpper
Oct 8, 2020·Physical Chemistry Chemical Physics : PCCP·A J Lopes JesusI Reva
May 8, 2021·The Journal of Physical Chemistry. a·Aurora PonziOksana Plekan
Apr 25, 2020·The Journal of Physical Chemistry. a·Oksana PlekanAurora Ponzi

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