Hamburg 2009 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 24: Elektronische Spektroskopie

MO 24.8: Vortrag

Freitag, 6. März 2009, 12:30–12:45, VMP 6 HS-G

Electronic spectrum of the lowest nπ* state of purine — •Michael Schneider, Tilman Hain, and Ingo Fischer — Institut für Physikalische Chemie, Universität Würzburg

We measured the electronic spectrum of the lowest lying electronic excited state of purine. In crystals, it was previously assigned to be of nπ* character which is in agreement with our measured c-type band countour shape. [1+1’]-Resonance enhanced multiphoton ionization (REMPI) and hydrogen atom action spectroscopy were employed. The band origin was found at 31309 cm⁻¹. The spectrum shows rich vibrational structure. Most peaks beyond ν_vib≈ 860 cm⁻¹ in the electronic excited state can be assigned to combination bands with two intensive vibrational modes.