The C(3P) + NH3 reaction in interstellar chemistry: II. Low temperature rate constants and modeling of NH, NH2 and NH3 abundances in dense interstellar clouds

摘要: A continuous supersonic flow reactor has been used to measure rate constants for the C + NH3 reaction over temperature range 50 296 K. atoms were created by pulsed laser photolysis of CBr4. The kinetics title followed directly vacuum ultra-violet induced fluorescence (VUV LIF) loss and through H formation. experiments show unambiguously that is rapid at K, becoming faster lower temperatures, reaching a value 1.8 10-10 cm3 molecule-1 s-1 As this not currently included in astrochemical networks, its influence on interstellar nitrogen hydride abundances tested dense cloud model including gas-grain interactions. In particular, effect ortho-to-para ratio H2 which plays crucial role synthesis examined.