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Title: Electron accommodation dynamics in the DNA base thymine

Abstract

The dynamics of electron attachment to the DNA base thymine are investigated using femtosecond time-resolved photoelectron imaging of the gas phase iodide-thymine (I{sup −}T) complex. An ultraviolet pump pulse ejects an electron from the iodide and prepares an iodine-thymine temporary negative ion that is photodetached with a near-IR probe pulse. The resulting photoelectrons are analyzed with velocity-map imaging. At excitation energies ranging from −120 meV to +90 meV with respect to the vertical detachment energy (VDE) of 4.05 eV for I{sup −}T, both the dipole-bound and valence-bound negative ions of thymine are observed. A slightly longer rise time for the valence-bound state than the dipole-bound state suggests that some of the dipole-bound anions convert to valence-bound species. No evidence is seen for a dipole-bound anion of thymine at higher excitation energies, in the range of 0.6 eV above the I{sup −}T VDE, which suggests that if the dipole-bound anion acts as a “doorway” to the valence-bound anion, it only does so at excitation energies near the VDE of the complex.

Authors:
; ;  [1];  [2]; ;  [3]
  1. Department of Chemistry, University of California, Berkeley, California 94720 (United States)
  2. Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 København Ø (Denmark)
  3. Department of Chemistry, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama City, Saitama 338-8570 (Japan)
Publication Date:
OSTI Identifier:
22490901
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 143; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANIONS; BOUND STATE; DIPOLES; DNA; ELECTRON ATTACHMENT; ELECTRONS; EV RANGE; EXCITATION; IODIDES; IODINE; MEV RANGE; PULSES; THYMINE; TIME RESOLUTION

Citation Formats

King, Sarah B., Yandell, Margaret A., Kunin, Alice, Stephansen, Anne B., Yokoi, Yuki, Takayanagi, Toshiyuki, Neumark, Daniel M., E-mail: dneumark@berkeley.edu, and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720. Electron accommodation dynamics in the DNA base thymine. United States: N. p., 2015. Web. doi:10.1063/1.4923343.
King, Sarah B., Yandell, Margaret A., Kunin, Alice, Stephansen, Anne B., Yokoi, Yuki, Takayanagi, Toshiyuki, Neumark, Daniel M., E-mail: dneumark@berkeley.edu, & Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720. Electron accommodation dynamics in the DNA base thymine. United States. https://doi.org/10.1063/1.4923343
King, Sarah B., Yandell, Margaret A., Kunin, Alice, Stephansen, Anne B., Yokoi, Yuki, Takayanagi, Toshiyuki, Neumark, Daniel M., E-mail: dneumark@berkeley.edu, and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720. 2015. "Electron accommodation dynamics in the DNA base thymine". United States. https://doi.org/10.1063/1.4923343.
@article{osti_22490901,
title = {Electron accommodation dynamics in the DNA base thymine},
author = {King, Sarah B. and Yandell, Margaret A. and Kunin, Alice and Stephansen, Anne B. and Yokoi, Yuki and Takayanagi, Toshiyuki and Neumark, Daniel M., E-mail: dneumark@berkeley.edu and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720},
abstractNote = {The dynamics of electron attachment to the DNA base thymine are investigated using femtosecond time-resolved photoelectron imaging of the gas phase iodide-thymine (I{sup −}T) complex. An ultraviolet pump pulse ejects an electron from the iodide and prepares an iodine-thymine temporary negative ion that is photodetached with a near-IR probe pulse. The resulting photoelectrons are analyzed with velocity-map imaging. At excitation energies ranging from −120 meV to +90 meV with respect to the vertical detachment energy (VDE) of 4.05 eV for I{sup −}T, both the dipole-bound and valence-bound negative ions of thymine are observed. A slightly longer rise time for the valence-bound state than the dipole-bound state suggests that some of the dipole-bound anions convert to valence-bound species. No evidence is seen for a dipole-bound anion of thymine at higher excitation energies, in the range of 0.6 eV above the I{sup −}T VDE, which suggests that if the dipole-bound anion acts as a “doorway” to the valence-bound anion, it only does so at excitation energies near the VDE of the complex.},
doi = {10.1063/1.4923343},
url = {https://www.osti.gov/biblio/22490901}, journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 2,
volume = 143,
place = {United States},
year = {Tue Jul 14 00:00:00 EDT 2015},
month = {Tue Jul 14 00:00:00 EDT 2015}
}