Abstract
Time-resolved transient absorption spectroscopy for water solution of cytosine with sub-10fs deep ultraviolet laser pulse is reported. Ultrafast electronic excited state dynamics and coherent molecular vibrational dynamics are simultaneously observed and their relaxation mechanisms are discussed.
Highlights
DNA and RNA exhibit ultrafast excited-state relaxation under deep ultraviolet (DUV) irradiation, which ensures that the molecules relax to the ground state through internal conversion before excited state reactions can occur
Sub 10-fs DUV pulse is successfully applied for the transient absorption spectroscopy of water solution of cytosine
A near UV (NUV) pulse is generated by frequency doubling of the fundamental pulse, which is negatively chirped by using a double-pass prism pair
Summary
DNA and RNA exhibit ultrafast excited-state relaxation under deep ultraviolet (DUV) irradiation, which ensures that the molecules relax to the ground state through internal conversion before excited state reactions can occur. To understand excited state dynamics of biologically relevant molecules such as DNA bases (adenine, thymine, cytosine, and guanine) in the context of their photo stability, there have been many spectroscopic studies on such molecules by means of time-resolved absorption and fluorescence measurements. Their excited state dynamics have not been fully understood yet due to the difficulty in generating ultrashort laser pulses in the DUV range. Transient absorption measurement using this ultrashort pulse allows us to simultaneously observe ultrafast electronic excited state dynamics and molecular vibrational dynamics
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