Abstract
Multiphoton ionization of nitric oxide expanded in a supersonic nozzle has been investigated. Isotopic selectivity is demonstrated by both wavelength selection and time-of-flight mass spectrometry. Sensitivity arises from the resonantly enhanced three-photon ionization of an ultracold nitric oxide beam (approx. 1 K). By use of this technique, /sup 15/N/sup 16/O, /sup 14/N/sup 18/O, and /sup 15/N/sup 18/O are detected in a natural abundance sample of nominally /sup 14/N/sup 16/O. It is shown that on the average as few as 10/sup 3/-10/sup 4/ molecules of /sup 15/N/sup 18/O can be detected in a single laser shot. The extension of this work to single-molecule detection is discussed.
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