Modeling of the H + NF2 reactive flow

The electronically excited species NF(a 1 Delta) and NF(b 1 Sigma +) are produced, respectively, by the reaction of discharge-produced NF2 radicals with H atoms and subsequent energy-transfer processes with vibrationally excited HF molecules in a medium-pressure flow tube. Use of the recently measured transfer and other reactive cross-sections has made it possible to achieve good agreement between the computed and measured populations of these two species along the flow distance. This agreement indicates a value for the rate coefficient for H + NF2 yields HF + NF(a 1 Delta) of 2.0 x 10 to the 13th power cc/mol-sec; for the transfer HF(3) + NF(a 1 Delta) yields HF(1) + NF(b 1 Sigma), a value of 6.0 x 10 to the 13th power cc/mol-sec at room temperature is indicated. The analysis also provides an indirect determination of the radiative lifetime of the NF(a 1 Delta) between 0.6 and 1 sec.