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

TL;DR

This study demonstrates the capture and ionization of cold atoms near a single carbon nanotube's wall, revealing large ionization cross sections and potential for sensitive atom detection.

Contribution

It provides new insights into atom-nanotube interactions, showing how nanotube geometry enhances ionization efficiency and enabling novel neutral atom detection methods.

Findings

Large ionization cross sections observed at modest voltages

Distinction between atomic capture and ionization effects

Potential for efficient neutral atom detectors

Abstract

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