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Journal Article

Longitudinal focusing and cooling of a molecular beam

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Crompvoets, F. M. H., Jongma, R. T., Bethlem, H. L., van Roij, A. J. A., & Meijer, G. (2002). Longitudinal focusing and cooling of a molecular beam. Physical Review Letters, 89(9): 093004. doi:10.1103/PhysRevLett.89.093004.

Cite as: https://hdl.handle.net/21.11116/0000-000B-4692-1
A neutral polar molecule experiences a force in an inhomogeneous electric field. This electric field can be designed such that a beam of polar molecules is exposed to a harmonic potential in the forward direction. In this potential the longitudinal phase-space distribution of the ensemble of molecules is rotated uniformly. This property is used to longitudinally focus a pulsed beam of ammonia molecules and to produce a beam with a longitudinal velocity spread of 0.76 m/s, corresponding to a temperature of 250 mu K.