skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Shape resonance spectra of uracil, 5-fluorouracil, and 5-chlorouracil

Abstract

We report on the shape resonance spectra of uracil, 5-fluorouracil, and 5-chlorouracil, as obtained from fixed-nuclei elastic scattering calculations performed with the Schwinger multichannel method with pseudopotentials. Our results are in good agreement with the available electron transmission spectroscopy data, and support the existence of three π* resonances in uracil and 5-fluorouracil. As expected, the anion states are more stable in the substituted molecules than in uracil. Since the stabilization is stronger in 5-chlorouracil, the lowest π* resonance in this system becomes a bound anion state. The present results also support the existence of a low-lying σ{sub CCl{sup *}} shape resonance in 5-chlorouracil. Exploratory calculations performed at selected C–Cl bond lengths suggest that the σ{sub CCl{sup *}} resonance could couple to the two lowest π* states, giving rise to a very rich dissociation dynamics. These facts would be compatible with the complex branching of the dissociative electron attachment cross sections, even though we cannot discuss any details of the vibration dynamics based only on the present fixed-nuclei results.

Authors:
;  [1]
  1. Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-990 Curitiba, Paraná (Brazil)
Publication Date:
OSTI Identifier:
22253588
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 140; Journal Issue: 2; Other Information: (c) 2014 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; BOND LENGTHS; CROSS SECTIONS; DISSOCIATION; ELASTIC SCATTERING; ELECTRON ATTACHMENT; RESONANCE; SPECTRA; SPECTROSCOPY; STABILIZATION; URACILS

Citation Formats

Kossoski, F., Varella, M. T. do N., and Bettega, M. H. F. Shape resonance spectra of uracil, 5-fluorouracil, and 5-chlorouracil. United States: N. p., 2014. Web. doi:10.1063/1.4861589.
Kossoski, F., Varella, M. T. do N., & Bettega, M. H. F. Shape resonance spectra of uracil, 5-fluorouracil, and 5-chlorouracil. United States. https://doi.org/10.1063/1.4861589
Kossoski, F., Varella, M. T. do N., and Bettega, M. H. F. 2014. "Shape resonance spectra of uracil, 5-fluorouracil, and 5-chlorouracil". United States. https://doi.org/10.1063/1.4861589.
@article{osti_22253588,
title = {Shape resonance spectra of uracil, 5-fluorouracil, and 5-chlorouracil},
author = {Kossoski, F. and Varella, M. T. do N. and Bettega, M. H. F.},
abstractNote = {We report on the shape resonance spectra of uracil, 5-fluorouracil, and 5-chlorouracil, as obtained from fixed-nuclei elastic scattering calculations performed with the Schwinger multichannel method with pseudopotentials. Our results are in good agreement with the available electron transmission spectroscopy data, and support the existence of three π* resonances in uracil and 5-fluorouracil. As expected, the anion states are more stable in the substituted molecules than in uracil. Since the stabilization is stronger in 5-chlorouracil, the lowest π* resonance in this system becomes a bound anion state. The present results also support the existence of a low-lying σ{sub CCl{sup *}} shape resonance in 5-chlorouracil. Exploratory calculations performed at selected C–Cl bond lengths suggest that the σ{sub CCl{sup *}} resonance could couple to the two lowest π* states, giving rise to a very rich dissociation dynamics. These facts would be compatible with the complex branching of the dissociative electron attachment cross sections, even though we cannot discuss any details of the vibration dynamics based only on the present fixed-nuclei results.},
doi = {10.1063/1.4861589},
url = {https://www.osti.gov/biblio/22253588}, journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 2,
volume = 140,
place = {United States},
year = {Tue Jan 14 00:00:00 EST 2014},
month = {Tue Jan 14 00:00:00 EST 2014}
}