Raman spectra of self-associates of guanosine were investigated in the 5–200 cm−1 region together with crystals of guanosine⋅2H2O, Na2⋅5′–UMP⋅7H2O, Na2⋅5′–GMP⋅7H2O, Na2⋅5′–CMP⋅8H2O, Na2⋅5′–dGMP⋅4H2O, and Na2⋅ATP⋅3H2O, to clarify the origin of the lowest Raman active mode of deoxyribonucleic nucleic acid (DNA). When the bases stack well to form a column, as in guanosine self-associates and crystals of guanosine and adenosine triphosphate (ATP), the spectral patterns are similar to that of DNA. The lowest-frequency bands are sharp and isolated from other bands. The result suggests that the origin of the lowest-frequency mode of DNA is assigned to the motion of bases stacked in a column. Guanosine has no phosphate groups, and ATP has no hydrogen bonds between bases in the crystal state. Therefore, neither hydrogen bonds between bases nor phosphate groups are necessary for the existence of this mode.
The Faraday rotation spectra in the Rabi regime were studied in krypton to investigate the behavior of a Zeeman coherence effect. At a laser intensity of 2.5 mW and a magnetic field of 3.4 mT, we determined a single-peaked line profile having a Gaussian form. Using the density matrix formalism, we have obtained an analytical form for the line shape and compared it with the observed ones. It is found that the line profile at a low magnetic field is mainly the contribution of the Zeeman coherence effect.
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