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MO: Fachverband Molekülphysik

MO 25: Poster: Quantum control

MO 25.2: Poster

Thursday, March 17, 2011, 16:00–18:00, P2

UV Quantum control spectroscopy approach on BP(OH)₂ — •Jens Möhring^1,2, Tiago Buckup¹, and Marcus Motzkus¹ — ¹Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, D-69120 Heidelberg, Germany — ²Physikalische Chemie, Philipps-Universität Marburg, D-35032 Marburg, Germany

Shaped femtosecond pulses are a versatile spectroscopic tool to gain additional insight into ultrafast dynamics of molecular systems. Such an approach, generally called Quantum Control Spectroscopy (QCS), has been successfully used with visible and infrared pulses. Just recently, QCS turn out to be valuable with UV absorbing systems due to direct UV pulse shaping technology. Here we investigate the dynamics of the excited state proton transfer (ESIPT) molecule [2,2’-bipyridyl]-3,3’-diol (BP(OH)₂). Directly modulated, sub 30 fs, UV pulses generated by a MEMS-based shaper [1] are applied as QCS pump pulses. BP(OH)2 exhibits two ESIPT transfers and shows steady state fluorescence from the double ESIPT product. Possible mechanisms suggest either parallel double and single ultrafast ESIPT processes [2] or a sequential model, since the possibility of two different reaction pathways in the molecule offers a promising leverage for a control approach. The absence of any population control effect in BP(OH)₂ over a multitude of control fields clearly favors a model with only a single initial reaction channel. Ref.:[1] J. Möhring, T. Buckup, C. Lehmann, and M. Motzkus, Journal of the Optical Society of America B 26, 1538-1544 (2009). [2] K. Stock, C. Schriever, S. Lochbrunner, and E. Riedle, Chemical Physics 349, 197-203 (2008).