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Titolo:
Controlling factors of tunneling reactions in solid hydrogen at very low temperature
Autore:
Miyazaki, T; Kumagai, J; Kumada, T;
Indirizzi:
Nagoya Univ, Sch Engn, Dept Appl Chem, Chikusa Ku, Nagoya, Aichi 4648603, Japan Nagoya Univ Nagoya Aichi Japan 4648603 a Ku, Nagoya, Aichi 4648603, Japan Japan Atom Energy Res Inst, Adv Sci Res Ctr, Tokai, Ibaraki 31911, Japan Japan Atom Energy Res Inst Tokai Ibaraki Japan 31911 Ibaraki 31911, Japan
Titolo Testata:
RADIATION PHYSICS AND CHEMISTRY
fascicolo: 4-5, volume: 60, anno: 2001,
pagine: 381 - 387
SICI:
0969-806X(200103)60:4-5<381:CFOTRI>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
RESOLUTION ESR SPECTROSCOPY; POTENTIAL-ENERGY SURFACE; QUANTUM DIFFUSION; RATE CONSTANTS; H-2(-) ANIONS; H-ATOMS; 4.2 K; REACTION HD+D->H+D-2; ELECTRON BUBBLES; RADICAL-ANIONS;
Keywords:
tunneling reaction; solid hydrogen; low temperature; H atoms; H-2 anions;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Miyazaki, T Nagoya Univ, Sch Engn, Dept Appl Chem, Chikusa Ku, Furo Cho, Nagoya, Aichi4648603, Japan Nagoya Univ Furo Cho Nagoya Aichi Japan 4648603 4648603, Japan
Citazione:
T. Miyazaki et al., "Controlling factors of tunneling reactions in solid hydrogen at very low temperature", RADIAT PH C, 60(4-5), 2001, pp. 381-387

Abstract

The recent studies on tunneling reactions: of our group are;auto-reviewed. The local structure around reactants, the new temperature effect. and the impurity effect are pointed out as important controlling factors of tunneling reactions in the solid phase. The distances between H(D) atoms and H-2(HD. D,) molecules in solid hydrogen and solid argon M ere estimated by ESR, electron nuclear double resonance (ENDOR), and electron spin echo (ESE). The temperature effects on tunneling reaction were observed in a reaction D HD --> D-2 + H in solid HD. A mechanism of a vacancy-assisted tunneling reaction has been proposed to account for the temperature effect. The strangetemperature dependence of a tunneling electron-transfer-reaction H-2(-) + H-2 + H-2(-) was explained in terms elf the phonon-scattering effect and the impurity effect on the tunneling reaction. The rate constant fur a tunneling reaction H + p-H-2 --> p-H-2 + H in solid para-H-2 (p-H-2) decreases with the increase in the concentration of ortho-H-2 (o-H-2). The results wereexplained by the model that the orientational defects: by o-H-2 molecules affect the tunneling reaction H + p-H-2. A tunneling reaction at very low temperature gives a surprising example in control of a reaction that a smallamount of energy as such 2 cal mol(-1) can affect the rate of a reaction. The tunneling reaction in the solid phase. which can be considered as a multidimensional tunneling phenomenon. is affected significantly by the condition surrounding reactants. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 01/10/20 alle ore 16:20:38