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J Phys Chem A. 2013 Oct 3;117(39):9725-31. doi: 10.1021/jp312368a. Epub 2013 Apr 22.

Identifying single molecular ions by resolved sideband measurements.

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  • 1Schools of Chemistry and Biochemistry; Computational Science and Engineering; and Physics, Georgia Institute of Technology , Atlanta, Georgia 30332, United States.


The masses of single molecular ions are nondestructively measured by cotrapping the ion of interest with a laser-cooled atomic ion, (40)Ca(+). Measurement of the resolved sidebands of a dipole forbidden transition on the atomic ion reveals the normal-mode frequencies of the two ion system. The mass of two molecular ions, (40)CaH(+) and (40)Ca(16)O(+), are then determined from the normal-mode frequencies. Isotopes of Ca(+) are used to determine the effects of stray electric fields on the normal mode measurement. The future use of resolved sideband experiments for molecular spectroscopy is also discussed.

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