Abstract
Observation of infrared emission following two-photon absorption has been widely employed to detect atomic oxygen O(3PJ) so far. In the present study, a method of detecting O(3PJ) with vacuum ultraviolet (VUV) instead of infrared emission has been developed. The scheme of detection is (i) 2p33p3PJ ←← 2p43PJ (UV two-photon absorption); (ii) 2p33p3PJ → 2p33s3S (transfer to the 3S state); and (iii) 2p33s3S → 2p43PJ (VUV emission). The present method is favorable under the conditions at high ambient pressures because the effect of undesirable collisional quenching is smaller than that on the detection of infrared. An application to the kinetic measurement relevant to O(3PJ) also has been demonstrated.
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