Methods for the detection of single atoms using optical and mass spectrometry. Invited lecture

Abstract

Possible candidates for single-atom detection (SAD) are considered. Among optical spectroscopic techniques, laser-enhanced atomic fluorescence spectrometry achieved the lowest limit of detection in elemental analysis obtained so far. Theoretically, laser-based optical spectrometry is capable of SAD, but not in a simultaneous multi-element mode of operation. The promising technique of optical trapping of atoms is discussed with respect to its analytical implications, including SAD. Inductively coupled plasma mass spectrometry does not allow SAD. Possibilities for the improvement of elemental mass spectrometry are considered and a new approach using atomic beam formation in conjunction with time-of-flight mass spectrometry is presented.