Kinetic Isotope Effects in the Reaction between Atomic Chlorine and Molecular Hydrogen. Tunnel Coefficients of the Hydrogen Atom through an Asymmetric Potential Barrier

1966 ◽  
Vol 44 (9) ◽  
pp. 3617-3626 ◽  
Author(s):  
Avigdor Persky ◽  
Fritz S. Klein
Keyword(s):  
Hydrogen Atom ◽  
Potential Barrier ◽  
Molecular Hydrogen ◽  
Isotope Effects ◽  
Kinetic Isotope Effects ◽  
Kinetic Isotope ◽  
Atomic Chlorine

Hydrogen atom mobility, kinetic isotope effects and tunneling on interstellar ices (I and ASW)

2017 ◽  
Vol 6 ◽  
pp. 59-69 ◽  
Author(s):  
Bethmini Senevirathne ◽  
Stefan Andersson ◽  
Francois Dulieu ◽  
Gunnar Nyman
Keyword(s):  
Hydrogen Atom ◽  
Isotope Effects ◽  
Kinetic Isotope Effects ◽  
Kinetic Isotope ◽  
Interstellar Ices

Kinetic isotope effects from reactions of muonium atoms in water with various ketones, and acetaldehyde: contrasts with hydrogen atoms

1997 ◽  
Vol 75 (1) ◽  
pp. 74-76 ◽  
Author(s):  
John M. Stadlbauer ◽  
Krishnan Venkateswaran ◽  
David C. Walker
Keyword(s):  
Hydrogen Atom ◽  
Muon Spin ◽  
Isotope Effects ◽  
Kinetic Isotope Effects ◽  
Muon Spin Rotation ◽  
Hydrogen Atoms ◽  
Tert Butyl ◽  
Kinetic Isotope ◽  
Dilute Aqueous Solutions ◽  
Butyl Ketone

This paper presents data showing that in dilute aqueous solutions of butanone, 3-pentanone, cyclohexanone, di-tert-butyl ketone, and acetaldehyde the addition reaction of muonium atoms occurs with a rate constant close to 1 × 108 M−1 s−1. The same value was obtained previously for acetone. Thus the reaction rate is virtually independent of the group attached to the C=O, be it a methyl, methylene, tert-butyl, or even a hydrogen atom. This is in sharp contrast to the reactivity of ordinary 1H atoms, whose rate constants are much slower and dependent on adjacent groups. In fact muonium and 1H react by different mechanisms, to form different products, so their rate ratio represents a complex kinetic isotope effect. Keywords: kinetic isotope effects, muonium atoms, muon spin rotation, ketones, hydrogen atom reactions.

Elimination of Molecular Hydrogen and Methane from Collision-Activated Alkoxide Negative Ions in the gas Phase. An ab initio and Isotope Effect Study

1985 ◽  
Vol 38 (8) ◽  
pp. 1197 ◽  
Author(s):  
RN Hayes ◽  
JC Sheldon ◽  
JH Bowie ◽  
DE Lewis
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Gas Phase ◽  
Molecular Hydrogen ◽  
Isotope Effects ◽  
Negative Ions ◽  
Kinetic Isotope Effects ◽  
Effect Study ◽  
Negative Ion ◽  
Kinetic Isotope

Ab initio calculations indicate that the collisional induced losses of molecular hydrogen from the ethoxide negative ion and methane from the t- butoxide negative ion to be stepwise processes in which the key intermediates are [H-… MeCHO ] and [Me-…Me2CO] respectively. Deuterium kinetic isotope effects observed for these and other alkoxide negative ions are in accord with the operation of a stepwise reaction.

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