✍ Scribed by Eric Herbst
No coin nor oath required. For personal study only.
Low-temperature experiments on the ion-molecule reaction between NH: and H2 show that this reaction can occur with an appreciable rate at very low temperature ( Q: 100 K) despite the existence of an activation energy barrier. Theoretical calculations have confirmed the mechanism for the process at low temperature to involve tunneling. Although very-low-temperature neutral-neutral reactions between radicals and Hz have yet to be studied in the laboratory, it is possible that such reactions can also proceed via tunneling under activation energy barriers. We estimate a non-negligible rate for the reaction between the radical CCH and H2 at very low temperatures.
📜 SIMILAR VOLUMES
A systematic study was performed with mixtures consisting of N2, CH4, C2H6 and C3H8, to investigate experimentally phase equilibria and caloric properties and to test the accuracy of thermodynamic correlations. The first part of this Paper reports results of T-p-x-y measurements on ternary systems i
Ion-molecule reactions at very low energies (<lo-\* eV) are investigated quantum-mechanically, taking the reaction H-+H+H2 t e as an example. Quantum effects, the zero-energy limit of the cross section, and the validity of an orbiting model are examined. Tbe orbiting model is found to be satisfactor
The rate constant t-or the formation of H:(I):) at (86 I 3)"K by the three-body process x'3 H:+2H2--+ H;+H2 has been dercrmined (k3(H) = (2.16 t 0.10) X 10-2B cm6/molecule2sec and k3(D) = (1.47 + 0.20) X 10-28 cm61 mo!ecule2sec) in a high pressure mass spectrometer. Comparison of this result with pu
The high-pressure bmiting rate constants of the reactlons between H or D atoms and three isotopic ethylenes have been measured in the temperature range 206-461 K. PractxaUy no isotope effects due to the differences between the ethylefies could be observed This result does not agree with the predicti