Laboratorní studia reakcí iontů O+ a N+ s molekulárním vodíkem a jeho izotopology HD a D2 při nízkých teplotách

Kovalenko, Artem

This work is focused on the laboratory studies of reactions of O+ and N+ ions with molecular hydrogen and its isotopologues, HD (hydrogen deuteride) and D2. The experimental studies were performed using a 22-pole radiofrequency ion trap in the temperature range from 15 K to 300 K. The temperature dependencies of measured reaction rate coefficients are presented for all reactions. Studied reactions are important for astrochemistry. The reaction of O+ with H2 initiates a water production sequence in the interstellar medium, and the rate coefficient does not change dramatically with temperatures in the covered range. The measured rate coefficients for reactions of O+ with H2, HD, and D2 are close to the corresponding Langevin rate coefficients. The reaction of O+ with HD has two reaction channels with products, OH+ and OD+. The ratio of rate coefficient of the OH+ production channel to the total reaction rate coefficient is close to 0.5 in the studied temperature range. The reaction of N+ with H2 initiates the ammonia production sequence in the interstellar medium. This reaction has activation energy on the order of a few meV, which is significant in the conditions of the interstellar medium. For reactions of N+ with H2 and its isotopologues, activation energies were determined from measured...

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