Diffusion- and activation-controlled reactions of muonium in aqueous solutions

Ng, B. W.; Jean, Y. C.; Ito, Yoko; Suzuki, Tsutomu; Brewer, J.H.; Fleming, Donald G.; Walker, David C.

doi:10.1021/j150604a027

Cited by 27 publications

(16 citation statements)

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“…The best example here is Mu + F2 + MuF + F (7), and is confirmed by theory (8). An example in water seems to be the Mu + NO3-reaction, where the measured pre-exponential factor (A = 7 x 10'' M-' s-') and activation energy (E,= 6 kJ/mol) are both remarkably small (3). These data suggest the type of behaviour indicated by the middle line of Fig.…”

Section: (B) Kinetic Isotope Effects Km/khsupporting

confidence: 73%

“…This seems to apply for simple gas phase reactions (2), but not for Mu reactions in solution (3). In water, both Mu and H reactions reach the same maximum rate constants at the diffusioncontrolled limit, and show a temperature dependence characteristic of water's viscosity ( E -17 kJ/mol, as in the top line of Fig.…”

Section: (B) Kinetic Isotope Effects Km/khmentioning

confidence: 90%

“…The right-hand side of this figure shows actual data obtained in water (3,4). The middle line represents reaction of Mu with NO3-.…”

Section: (B) Kinetic Isotope Effects Km/khmentioning

confidence: 99%

“…There is almost no pH dependence on the Mu reaction, so it can probably also be ignored for the H reaction. Product analysis of the H reaction has shown there are two channels (21), with addition via reaction [3] being only half as fast as abstraction via reaction [4].…”

Section: (A) Reaction Rate Constants In Watermentioning

confidence: 99%

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Isotope effects in solution: contrasts between muonium and hydrogen in reactions with acetone

Walker¹

1990

Can. J. Chem.

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Munoniurn atoms are hydrogen isotopes with positive muons rather than protons, deuterons, or tritons as nuclei. Thus, they have one ninth the mass of 'H, and microsecond lifetimes. By using nuclear physics counting techniques, rnuoniurn can be studied in a wide variety of media and its chemical and physical properties used to appraise hydrogen. Results are described for the interaction of muoniurn with acetone, showing two types of kinetic isotope effects, formation of free radicals, evidence for intermolecular "rnuoniurn bonding", and rnicelle-induced enhancements of reaction rate constants.

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Section: (B) Kinetic Isotope Effects Km/khsupporting

confidence: 73%

Section: (B) Kinetic Isotope Effects Km/khmentioning

confidence: 90%

“…The right-hand side of this figure shows actual data obtained in water (3,4). The middle line represents reaction of Mu with NO3-.…”

Section: (B) Kinetic Isotope Effects Km/khmentioning

confidence: 99%

Section: (A) Reaction Rate Constants In Watermentioning

confidence: 99%

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Isotope effects in solution: contrasts between muonium and hydrogen in reactions with acetone

Walker¹

1990

Can. J. Chem.

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“…There are reasons for believing it is not due to chemical reactions of Mu with either impurities or water itself based on its measured temperature dependence (13). Instead, it may be an artifact arising from the MSR equipment or technique rather than the chemical medium (9,11).…”

Section: (I) Muonium Reactivitymentioning

confidence: 99%

Muonium atoms observed in liquid hydrocarbons

Ito¹,

Ng²,

Jean³

et al. 1980

Can. J. Chem.

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. 58,2395 (1980). Muonium atoms have been observed in n-hexane, c-hexane, and tetramethylsilane at 295 or 273 K by the MSR technique. The yield of muonium in these non-polar liquids is found to be quite comparable to that observed previously in water, methanol, and ethanol. This suggests that neither the dielectric constant of the medium nor the free-electron mobility has a major influence on the formation process. This in turn supports the view that muonium formation does not mainly result from intraspur reactions in the terminal spur of the muon's track.The chemical lifetime of muonium in these hydrocarbons is curtailed by spurious impurities so that high purity is required. In addition, however, there may be a chemical reaction between muonium and the hydrocarbon itself because the maximum lifetime I found increases in the order of increasing bond energy. Reaction rate constants with added solutes have also been measured, and these observations open up the possibility of studying hydrophobic solutes and extending hydrogen-isotope studies to biologically-important media. Chem. 58,2395Chem. 58, (1980. On a observe des atomes de muonium dans le n-hexane, le c-hexane et dans le tetramethylsilane a 295 ou 273 K par la technique de RSM. On a trouve que le rendement en muonium dans ces liquides non polaires est tout a fait comparable a celui observC antkrieurement dans I'eau, le methanol et I'ethanol. Ceci suggtre que ni la constante dielectrique du milieu ni la mobilite des electrons libres n'a d'influence sur la formation des muonium. Cette conclusion appuie le fait que la formation des muonium ne provient pas principalement de reactions a I'interieur de la derniere cavite de la trajection du muon.La presence d'impuretes parasites diminue la durte de vie du muonium dans ces hydrocarbures; il faut donc operer avec des solvants d'une trbs grande purete. De plus, il semble qu'une reaction chimique se produit entre le muonium et I'hydrocarbure puisqu'on a trouve que la duree maximale devie

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Chemical reactions induced and probed by positive muons

Ito

1990

Topics in Current Chemistry

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Diffusion- and activation-controlled reactions of muonium in aqueous solutions

Cited by 27 publications

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Isotope effects in solution: contrasts between muonium and hydrogen in reactions with acetone

Isotope effects in solution: contrasts between muonium and hydrogen in reactions with acetone

Muonium atoms observed in liquid hydrocarbons

Chemical reactions induced and probed by positive muons

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