Stark-selected beam of ground-state OCS molecules characterized by revivals of impulsive alignment |
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Authors: | Nielsen Jens H Simesen Paw Bisgaard Christer Z Stapelfeldt Henrik Filsinger Frank Friedrich Bretislav Meijer Gerard Küpper Jochen |
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Institution: | Department of Physics and Astronomy, University of Aarhus, 8000 Aarhus C, Denmark. |
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Abstract: | We make use of an inhomogeneous electrostatic dipole field to impart a quantum-state-dependent deflection to a pulsed beam of OCS molecules, and show that those molecules residing in the absolute ground state, X(1)Σ(+), |00(0)0>, J = 0, can be separated out by selecting the most deflected part of the molecular beam. Past the deflector, we irradiate the molecular beam by a linearly polarized pulsed nonresonant laser beam that impulsively aligns the OCS molecules. Their alignment, monitored via velocity-map imaging, is measured as a function of time, and the time dependence of the alignment is used to determine the quantum state composition of the beam. We find significant enhancements of the alignment ( = 0.84) and of state purity (>92%) for a state-selected, deflected beam compared with an undeflected beam. |
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