4.6 Article

Rotational state detection of electrically trapped polyatomic molecules

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NEW JOURNAL OF PHYSICS
卷 17, 期 -, 页码 -

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IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/17/5/055022

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cold molecules; state detection; rotational state; electric trapping; polyatomic molecules

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Detecting the internal state of polar molecules is a substantial challenge when standard techniques such as resonance-enhanced multiphoton ionization or laser-induced fluorescense do not work. As this is the case for most polyatomic molecule species, in this paper we investigate an alternative based on state-selective removal of molecules from an electrically trapped ensemble. Specifically, we deplete molecules by driving rotational and/or vibrational transitions to untrapped states. Fully resolving the rotational state with this method can be a considerable challenge, as the frequency differences between various transitions are easily substantially less than the Stark broadening in an electric trap. However, by using a unique trap design that provides homogeneous fields in a large fraction of the trap volume, we successfully discriminate all rotational quantum numbers, including the rotational M-substate.

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