CRESU study of the reaction N(+) + H2 yields NH(+) + H between 8 and 70 K and interstellar chemistry implications

Details CRESU study of the reaction N(+) + H2 yields NH(+) + H between 8 and 70 K and interstellar chemistry implications CRESU study of the reaction N(+) + H2 yields NH(+) + H between 8 and 70 K and interstellar chemistry implications

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...147..115m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 147, no. 1, June 1985, p. 115-120. Research supported by the Centre National d

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39

Association Reactions, Hydrogen, Interstellar Chemistry, Nitrogen, Supersonic Flow, Activation Energy, Ammonia, Endothermic Reactions, Reaction Kinetics

Scientific paper

The reaction N+(3P) + H2(J = 0,1) yields NH(+) + H(1) has been studied in the temperature range 8-70 K using a newly developed supersonic jet apparatus, CRESU. The CRESU technique permits measurements under true thermal conditions in the isentropic core of a uniform supersonic jet. An electron beam of 20 keV and 100 microamperes was the primary ionization source in the supersonic flow. Reactant and product ions were monitored using a quadrupole mass spectrometer counting system. Helium was used as the buffer gas, and the electron beam yielded He(+) ions and metastable He(M) ions. It is found that the reaction rate coefficient kone decreased in relation to decreasing temperature according to the following exponential law: kone = 5.1 x 10 to the -10th exp(-E/J/)T per cu cm/s, with E(0) = 215 K and E(1) = 40 K. The implications of the above results for the formation of ammonia in interstellar clouds are briefly discussed.

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