Intensities of DNA ion-phosphate modes in the low-frequency Raman spectra
In: The European physical journal. E, Soft matter (Print), Jg. 31 (2010), Heft 2, S. 201-205
Online
academicJournal
- print, 42 ref
Zugriff:
The Raman intensities of counterion vibrations with respect to the phosphate groups of the double-helix backbone (ion-phosphate modes) in the low-frequency spectra (< 200cm-1) of B-DNA with different alkali metal counterions have been calculated using the model for DNA conformational vibrations and the valence-optic approach. The results have showed that the spectra of DNA with heavy counterions (Rb+ and Cs+) differ from the spectra of DNA with light counterions (Na+ and K+). The calculated spectra of DNA with heavy counterions are characterized by intensive modes of ion-phosphate vibrations that form one united band near 115 cm-1. Ion-phosphate modes in the spectra of DNA with light counterions are characterized by higher frequencies (near 180cm-1) and much lower intensity. Our calculations explain why the modes of ion-phosphate vibrations are observed in Cs-DNA spectra rather than in Na-DNA. The determined sensitivity of the intensities of DNA low-frequency spectra to the counterion type proves the existence of the ion-phosphate modes.
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Intensities of DNA ion-phosphate modes in the low-frequency Raman spectra
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Autor/in / Beteiligte Person: | PEREPELYTSYA, S. M ; VOLKOV, S. N |
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Zeitschrift: | The European physical journal. E, Soft matter (Print), Jg. 31 (2010), Heft 2, S. 201-205 |
Veröffentlichung: | Les Ulis: EDP Sciences, 2010 |
Medientyp: | academicJournal |
Umfang: | print, 42 ref |
ISSN: | 1292-8941 (print) |
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