1997 Fiscal Year Final Research Report Summary
Theoretical Study of Dynamical Processes in Highly Excited Molecules up to Double Ionization
Project/Area Number |
07640534
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
物理学一般
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Research Institution | KITASATO UVIVERSITY,SHOOL OF MEDICINE |
Principal Investigator |
TAKAGT Hidekazu Kitasato Univ.School of Medicine, Assistant Professor, 医学部, 講師 (00129248)
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Project Period (FY) |
1995 – 1997
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Keywords | dissociative recombination / dissociative excitation / quantum defect theory / Lippmann-Schwinger equation / cooler ring / molecularrion・electron scattering / Hydrogen molecalar ion / He ium Hydride |
Research Abstract |
I have done theoretical studies on the dynamic processes relevant to the highly excited electronic states, of which energies are near and higher than the 1st ionization potential. The processes mainly studied are dissociative recombination (DR) and dissociative excitation (DE). of which mechanism is common to the other processes as rotational and vibrational excitation by electron impact. There is strong, quantum mechanical, and high density coupling between electronic and nuclear motion in those processes. I developed some theoretical methods to represent those complex processes, and made clear the mechanism of those processes and availability of the present methods by numerical calculation. The studied molecular systems are H_2 and HeH and those isotopes, which are typical two systems controlled by quite different mechanisms. In the DR if HD^+ + e, its mechanism changes with collision energy. At the lower energy, I investigated the process including the rotational motion and estimating precisely the effect of nonadiabatic electronic resonance scattering. This result the first to represent the experimental structures. At the higher energy, I calculated the DR and DE cross sections by introducing the discretized dissociative basis functions to the usual multichannel quantum defect theory. Besides obtaining the atomic data, I show the common mechanism between the DR and DE. The present study shows the reason of large cross section in the DR of HeH^+, where the dissociative resonance state is absent. The nonadiabatic coupling between the dissociative states could be represented by introducing the idea of closed dissociative channel. The present calculation reproduce the experimental spectrum and isotope dependence for the first time.
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Research Products
(17 results)
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[Publications] T.Tanabe, I.Katayama, H.Kamegaya, K.Chida, Y.Arakaki, T.Watanabe, M.Yoshizawa, M.Saito, Y.Haruyama, K.Hosono, K.Hatanaka, T.Honma, K.Noda, S.Ohtani, and H.Takagi: "Dissociative recombination of HD^+ with an ultracold electron beam in cooler ring" Phys.Rev.Lett.75. 1066-1069 (1995)
Description
「研究成果報告書概要(欧文)」より
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[Publications] T.Tanabe, I.Katayama, S.Ono, K.Chida, T.Watanabe, Y.Arakaki, Y.Haruyama, M.Saito, T.Odagiri, K.Hosono, K.Noda, T.Honma, and H.Takagi: "Dissociative recombination of HeH+ isotopes with an ultracold electron beam from a superconducting electron cooler in a storage ring" J.Phys.B. 31 (letter to the editor) (in printing). (1998)
Description
「研究成果報告書概要(欧文)」より
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[Publications] T.Tanabe, I.Katayama, H.Kamegaya, K.Chida, Y.Arakaki, T.Watanabe, M.Yoshizawa, M.Saito, Y.Haruyama, K.Hosono, K.Hatanaka, T.Honma, K.Noda, S.Ohtani, and H.Takagi: "Dissociative recombination of light molecular ions in the strage ring TARN II" Dissociative Recombination ; Theory, Experiment, Applications III,Editors ; D.Zajfman, J.B.A.Mitchell, D.Schwalm and B.R.Rowe (Wold Scientific). 84-93 (1996)
Description
「研究成果報告書概要(欧文)」より
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[Publications] T.Tanabe, I.Katayama, S.Ono, K.Chida, T.Watanabe, Y.Arakaki, Y.Haruyama, M.Saito, T.Odagiri, K.Hosono, K.Noda, T.Honma, I.Nomura, and H.Takagi: "Dissociative recombination of molecular ions with a l meV temperature electron beam from a super-conducting elecron cooler at the TARN II storage ring" Abstracts of contributed papers on the 20th International Conference on the Physics of Electronic and Atomic Collisions, Viena, Austria. TU132. (1997)
Description
「研究成果報告書概要(欧文)」より
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[Publications] T.Tanabe, I.Katayama, H.Kamegaya, K.Chida, T.Watanabe, Y.Arakaki, M.Yoshizawa, M.Saito, Y.Haruyama, K.Hosono, K.Hatanaka, T.Honma, K.Noda, S.Ohtani, and H.Takagi: "Dissociative recombination of molecular ions in a cooler ring" AIP conference proceedings. 360. 329-338 (1995)
Description
「研究成果報告書概要(欧文)」より
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