Hannover 2013 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 14: Poster 1: Cluster, Femtosecond Spectroscopy

MO 14.23: Poster

Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof

Fs-Photoelectron spectroscopy of adenine and adenosine in aqueous solution — •Franziska Buchner and Andrea Lübcke — Max-Born-Institut Berlin

Interaction of ultraviolet light with DNA molecules may lead to photodamage and consequently may cause development of cancer. Upon excitation, natural DNA bases reveal ultrafast relaxation mechanisms that prevent photodamage.

We report on the photoelectron spectra of adenine and adenosine in aqueous solution including both the pump probe spectra and spectra due to one-colour multi-photon ionization (pump-only and probe-only). Sub-100 fs pulses of 266 nm are used to excite a 1 mmolar buffered solution of adenine and adenosine. Delayed pulses in the range of 238-248 nm (sub-100 fs) probe the excited state by photoionization. The kinetic energy distribution of the electrons contains information on the time-dependent binding energy of the excited state.

We will describe and interpret in detail the photoelectron spectra in terms of the excited state dynamics of adenine and adenosine.