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The pressure dependence of the OH yield in the reaction O( 1 D) + CH 4  has been investigated at room temperature in the pressure range from 4 to 560 bar of helium. O( 1 D)-atoms were generated by pulsed laser photolysis (PLP) of N 2 O and OH-radicals were detected by saturated laser induced fluorescence (SLIF). The OH-yield was determined relative to the OH yield in the reaction of O( 1 D) with H 2  which is assumed to be unity and pressure independent. Within the pressure range of our experiments we found a constant OH-yield of (71±5)% in the reaction of O( 1 D) with methane. From the OH fluorescence lifetime at the highest pressures near 500 bar of helium we obtained the rate constant for the collisional deactivation of electronically OH radicals of k q (He) = (3±0.3)× 10 -15  cm 3  s -1 , corresponding to a cross section of σ q (He) = (2.1±0.2)× 10 -20  cm 2 . The rate constant for collisional deactivation of vibrationally excited OH radicals in the electronic ground state OH(v=1) + He → OH(v=0) + He (reaction (5)) was determined to be k 5 (He) = (1.2±0.2)× 10 -16  cm 3  s -1 .

The OH-yield in the reaction of O( 1 D) + CH 4 under high pressure conditions up to 560 bar helium