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Dielectric functions of DNA base films from near‐infrared to ultra‐violet
Author(s) -
Silaghi S. D.,
Friedrich M.,
Cobet C.,
Esser N.,
Braun W.,
Zahn D. R. T.
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200562220
Subject(s) - thymine , guanine , dielectric , cytosine , infrared , materials science , nucleobase , molecule , chemistry , dna , analytical chemistry (journal) , optoelectronics , optics , nucleotide , physics , organic chemistry , biochemistry , gene
Abstract This work is reporting the dielectric functions of DNA base films, i.e. guanine, adenine, cytosine, and thymine in the energy range from near‐infrared to ultra‐violet. Spectroscopic ellipsometry using synchrotron radiation was employed in situ on DNA base films grown on hydrogen terminated Si(111) surfaces under ultra‐high vacuum conditions. The optical response of adenine and guanine films is described by a uniaxial model while in the case of thymine and cytosine films an isotropic model was employed. The imaginary part of the dielectric functions ε 2 of the DNA base films is compared with the electronic transitions of single molecules calculated using time‐dependent density functional theory. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)