Physics – Chemical Physics
Scientific paper
2011-05-12
Phys. Chem. Chem. Phys. 13, 18971-18975 (2011)
Physics
Chemical Physics
Scientific paper
10.1039/C1CP21143A
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, $X ^1\Sigma^+$, $\ket{00^00}$, 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 (\costhetasqtd $= 0.84$) and of state purity ($> 92$%) for a state-selected, deflected beam compared with an undeflected beam.
Bisgaard Christer Z.
Filsinger Frank
Friedrich Bretislav
Küpper Jochen
Meijer Gerard
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