التفاصيل البيبلوغرافية
العنوان: |
Electron attachment dynamics following UV excitation of iodide-2-thiouracil complexes. |
المؤلفون: |
Koga, Masafumi, Asplund, Megan, Neumark, Daniel M. |
المصدر: |
Journal of Chemical Physics; 6/28/2022, Vol. 156 Issue 24, p1-9, 9p |
مصطلحات موضوعية: |
PHOTOELECTRON spectroscopy, ELECTRONS, ANIONS, TIME-resolved spectroscopy, PHOTODETACHMENT |
مستخلص: |
The dynamics of low energy electron attachment to the thio-substituted uracil analog 2-thiouracil are investigated using time-resolved photoelectron spectroscopy (TRPES) of iodide-2-thiouracil (I−·2TU) binary clusters. In these experiments, the anions are excited at pump energies of 4.16 and 4.73 eV, and the ensuing dynamics are probed by photodetachment at 1.59 and 3.18 eV. Upon excitation near the vertical detachment energy (4.16 eV), dipole bound (DB) and valence bound (VB) anion signals appear almost instantaneously, and the DB state of the 2TU anion undergoes an ultrafast decay (∼50 fs). At 4.73 eV, there is no evidence for a DB state, but features attributed to two VB states are seen. The transient negative ions formed by photoexcitation decay by autodetachment and I− fragmentation. The I− dissociation rates and their dependence on excitation energy agree reasonably well with the Rice–Ramsperger–Kassel–Marcus calculations. Notable differences with respect to TRPES of the related iodide–uracil anion are observed and discussed. [ABSTRACT FROM AUTHOR] |
|
Copyright of Journal of Chemical Physics is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
قاعدة البيانات: |
Complementary Index |