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A new method based on laser induced two photon ionization was developed for detection of low levels of NO concentration in the troposphere. A frequency-doubled pulsed dye laser operating at near 226 nm was used to photoionize NO by a (1ϩ1) resonance enhanced two photon ionization via its A 2 ⌺←X 2 ⌸(0,0) band. NO ions are detected by an electron multiplier. Air gas samples are injected through a pulsed nozzle into a vacuum chamber. Cooling of rovibrational levels during the expansion processdoi:10.1063/1.1148213 fatcat:fbpvcpcf7rh3hgri7i7j5nt2wm