Hannover 2010 – scientific programme
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MO: Fachverband Molekülphysik
MO 20: Experimental Techniques I
MO 20.3: Talk
Thursday, March 11, 2010, 11:30–11:45, F 142
Quantum state effects on alignment and orientation of OCS — •Jens Hedegaard Nielsen1, Jochen Maurer2, Sofie Louise Kragh2, Henrik Stapelfeldt2,4, Frank Filsinger3, Jochen Küpper3, and Gerard Meijer3 — 1Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark — 2Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark — 3Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany — 4Interdisciplinary Nanoscience Center (iNANO), Aarhus University, 8000 Aarhus C, Denmark
We present new experiments and simulations of laser induc adiabatic alignment and orientation of Quantum-State-Selected carbonyl sulfide (OCS). We systematically investigated the effect of rotational quantum levels on the degree of alignment and orientation.
A molecular beam is formed in a supersonic expansion and deflected in a strong inhomogeneous electric field. The deflection strength is determined by the effective dipole moment and thus the molecular rotational quantum state. The molecular beam is crossed by two focused laser beams. One nanosecond alignment beam and one femtosecond Coulomb explosion probe beam. The adiabatic laser alignment and mixed static field and laser orientation is investigated as a function of position in the molecular beam and thus as a function of the selected rotational states. We also present simulations of the alignment and mixed field orientation for individual quantum states as well as the states present in the deflected beam as extracted from Monte-Carlo trajectory simulations of the deflection process.