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Journal Article

State-selective detection of velocity-filtered ND₃ molecules


Bertsche,  Benjamin
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Bertsche, B., & Osterwalder, A. (2010). State-selective detection of velocity-filtered ND₃ molecules. Physical Review A, 82(3): 033418. doi:10.1103/PhysRevA.82.033418.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-26B1-3
Translationally cold and slow ND3 is prepared by filtering the slow molecules from a thermal gas-phase sample using a curved electrostatic hexapole guide. This filter, like the curved quadrupole guide introduced by Rangwala et al. [Phys. Rev. A 67, 043406 (2003)] selects molecules by their forward velocity and effective electric dipole moment. Here we describe two main modifications with respect to previous work: (1) A segmented hexapole guide is used that produces a harmonic potential for the linearly Stark-shifted levels of ND₃. A curved guide is combined with a straight hexapole guide, and independent high-voltage supplies are employed to allow for bandpass velocity filtering. (2) State-selective laser ionization is used to obtain time- and state-selective detection of the guided molecules. This enables the experimental determination of the rotational state population of the guided molecules.