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We observe the capture and field ionization of individual atoms near the sidewall of a single suspended nanotube. Extremely large cross sections forionization from an atomic beam are observed at modest voltages due to thenanotube's small radius and extended length. The effects of the field strengthon both the atomic capture and the ionization process are clearly distinguishedin the data, as are prompt and delayed ionizations related to the locations atwhich they occur. Efficient and sensitive neutral atom detectors can be basedon the nanotube capture and wall ionization processes.

Field Ionization of Cold Atoms near the Wall of a Single Carbon Nanotube