U.S. National Inst. of Standards & Technology

Laser method identifies, counts toxic molecules

Published in Telemedicine Business Week, March 10th, 2004

A spectroscopy technique that offers advances in detection of toxic chemicals and counting of molecules has been demonstrated by a U.S. National Institute of Standards and Technology (NIST) scientist and collaborators.

Described in the Journal of Chemical Physics, the NIST-patented technique may be useful for development of miniaturized chemical sensors, as well as for fundamental surface science studies.

The technique (a variation on cavity ring-down spectroscopy) relies on laser light reflecting and circulating inside a prism-like optical resonator. The time it takes the light to diminish (or ring down) changes depending on whether specific...

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Source: Telemedicine Business Week (2004-03-10)

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