%0 Journal Article %T Non-Destructive Identification of Cold and Extremely Localized Single Molecular Ions %A M. Drewsen %A A. Mortensen %A R. Martinussen %A P. Staanum %A J. L. S£¿rensen %J Physics %D 2004 %I arXiv %R 10.1103/PhysRevLett.93.243201 %X A simple and non-destructive method for identification of a single molecular ion sympathetically cooled by a single laser cooled atomic ion in a linear Paul trap is demonstrated. The technique is based on a precise determination of the molecular ion mass through a measurement of the eigenfrequency of a common motional mode of the two ions. The demonstrated mass resolution is sufficiently high that a particular molecular ion species can be distinguished from other equally charged atomic or molecular ions having the same total number of nucleons. %U http://arxiv.org/abs/physics/0406088v1