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• W2093643755 abstract "We demonstrate an atom detector based on field ionization and subsequent ion counting. We make use of field enhancement near tips of carbon nanotubes to reach extreme electrostatic field values of up to $9ifmmodetimeselsetexttimesfi{}{10}^{9}text{ }text{V}/text{m}$, which ionize ground-state rubidium atoms. The detector is based on a carpet of multiwall carbon nanotubes grown on a substrate and used for field ionization, and a channel electron multiplier used for ion counting. We measure the field enhancement at the tips of carbon nanotubes by field emission of electrons. We demonstrate the operation of the field ionization detector by counting atoms from a thermal beam of a rubidium dispenser source. By measuring the ionization rate of rubidium as a function of the applied detector voltage we identify the field ionization distance, which is below a few tens of nanometers in front of nanotube tips. We deduce from the experimental data that field ionization of rubidium near nanotube tips takes place on a time scale faster than ${10}^{ensuremath{-}10}text{ }text{s}$. This property is particularly interesting for the development of fast atom detectors suitable for measuring correlations in ultracold quantum gases. We also describe an application of the detector as partial pressure gauge." @default.
• W2093643755 created "2016-06-24" @default.
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• W2093643755 date "2009-12-14" @default.
• W2093643755 modified "2023-09-23" @default.
• W2093643755 title "Integrated atom detector based on field ionization near carbon nanotubes" @default.
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• W2093643755 doi "https://doi.org/10.1103/physreva.80.063422" @default.
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