Pollution Monitor for Nitric Oxide: A Laser Device Based on the Zeeman Modulation of Absorption

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Science  05 May 1972:
Vol. 176, Issue 4034, pp. 508-510
DOI: 10.1126/science.176.4034.508


The Concentration of nitric oxide can be monitored by a new device in which the Zeeman effect is used to shift an absorption line of nitric oxide into coincidence with a laser line of carbon monoxide. The absorption is modulated by a small, oscillating magnetic field. This device is specific for nitric oxide and is not subject to interference from other gases.