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Radiation Protection Dosimetry Advance Access originally published online on December 14, 2006
Radiation Protection Dosimetry 2006 122(1-4):66-71; doi:10.1093/rpd/ncl388
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

VUV spectroscopy of water under cellular conditions

R. Mota1, R. Parafita1, M. J. P. Maneira1, N. J. Mason2, G. Garcia3, P. A. Ribeiro4, M. Raposo4 and P. Limão-Vieira1,2,*

1 Laboratório de Colisões Atómicas e Moleculares, Departamento de Física, CEFITEC, FCT-Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
2 Centre of Molecular and Optical Sciences, Department of Physics and Astronomy, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
3 Instituto de Matemáticas y Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 113-bis, 28006 Madrid, Spain
4 Grupo de Óptica e Imagem, Departamento de Física, CEFITEC, FCT-Universidade Nova de Lisboa, 2829-516 Caparica, Portugal

*Corresponding author: plimaovieira{at}fct.unl.pt


  Abstract

The understanding of radiation damage within cells, and thence mutagenesis, depends upon a detailed knowledge of the spectroscopy and dissociation dynamics of water. Results of a new study of the electronic state spectroscopy of water, using synchrotron radiation are reported. In order to gain some insight into how the spectroscopy and dissociation dynamics of water is influenced by its environment we also report photo-absorption spectra of water within thin films of poly(o-methoxyaniline) which have been suggested as a good mimic for biological membranes in the cellular environment. Comparison of these spectra with those of gaseous water and condensed amorphous water ice suggest that water in such films is similar to gaseous water and does not show the blue shift suggested in some cellular models. The lowest energy of OH production from dissociation of water in the cellular environment may therefore be around 6.7 eV (185 nm).


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