Reactions of atomic hydrogen in water : solvent and isotope effects.

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It has been known for many years that hydrogen atoms can be easily created and studied in water using radiolytic techniques [1]. The use of CW EPR detection coupled with electron radiolysis proved extremely useful in estimating many reaction rates, and revealed the interesting phenomenon of chemically induced dynamic electron polarization (CIDEP) [2]. In recent years, we have made use of pulsed EPR detection to make precision reaction rate measurements which avoid the complications of CIDEP [3]. Activation energies and H/D isotope effects measured in these studies [4-14] will be described below. An interesting aspect of the hydrogen atom reactions ... continued below

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8 p.

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Bartels, D. M. June 10, 1999.

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It has been known for many years that hydrogen atoms can be easily created and studied in water using radiolytic techniques [1]. The use of CW EPR detection coupled with electron radiolysis proved extremely useful in estimating many reaction rates, and revealed the interesting phenomenon of chemically induced dynamic electron polarization (CIDEP) [2]. In recent years, we have made use of pulsed EPR detection to make precision reaction rate measurements which avoid the complications of CIDEP [3]. Activation energies and H/D isotope effects measured in these studies [4-14] will be described below. An interesting aspect of the hydrogen atom reactions is the effect of hydrophobic solvation. EPR evidence--an almost gas-phase hyperfine coupling and extremely narrow linewidth--is quite convincing to show that the H atom is just a minimally perturbed gas phase atom inside a small ''bubble''. In several systems we have found that the hydrophobic free energy of solvation dominates the solvent effect on reaction rates.

Physical Description

8 p.

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OSTI as DE00011784

Medium: P; Size: 8 pages

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  • 218th American Chemical Society National Meeting, New Orleans, LA (US), 08/22/1999--08/26/1999

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  • Report No.: ANL/CHM/CP-98924
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 11784
  • Archival Resource Key: ark:/67531/metadc625038

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  • June 10, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 11, 2017, 6:12 p.m.

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Bartels, D. M. Reactions of atomic hydrogen in water : solvent and isotope effects., article, June 10, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc625038/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.