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mutual neutralization in low-energy collisions of Na^(+)+H^(-)ions

Chinese Physics B 2023年第8期32卷 25-31页

作者：王堃董川屈一至吴勇林晓贺 Robert J.Buenker Institute of Environmental Science Shanxi UniversityTaiyuan 030006China College of Material Sciences and Optoelectronic Technology University of Chinese Academy of SciencesBeijing 100049China National Key Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China Faculty of Foundation Space Engineering UniversityBeijing 101416China Fachbereich C-Mathematik und Naturwissenschaften Bergische Universitat WuppertalD-42097 WuppertalGermany

The low-energy mutual neutralization(MN)reactions Na^(+)+H^(-)→Na(nl)+H have been studied by employing the full quantum-mechanical molecular-orbital close-coupling(QMOCC)method over a wide energy range of 10^(-3)-10^(3) e V/*** and state-selective cross sections have been investigated and compared with the available theoretical and experimental data,and the state-selective rate coefficients for the temperature range of 100-10000 K have been *** the present work,all the necessary highly excited states are included,and the influences of rotational couplings and 10 active electrons are *** is found that in the energy below 10 e V/u,the Na(4s)state is the most dominant exit state with a contribution of approximately 78%to the branch fraction,which is in best agreement with the experimental *** energies above 10 e V/u,the MN total cross section is larger than those obtained in other theoretical calculations and shows a slow decreasing trend because the main exit states change,when the energy is above 100 e V/u,the dominant exit state becomes the Na(3p)state,while the Na(4s)state becomes the third most important exit *** datasets presented in this paper,including the potential energy curve,the radial and rotational couplings,the total and state-selective cross sections,are openly available at https://***/10.57760/sciencedb.j00113.00112.

关键词： mutual neutralization cross section rate coefficient quantum-mechanical molecular-orbital closecoupling(QMOCC)method

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mutual recombination in slow Si^＋＋ H^- collisions

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Chinese Physics B 2006年第11期15卷 2651-2656页

作者：王建国刘春雷 Janev R. K 颜君施建荣 Institute of Applied Physics and Computational Mathematics Beijing 100088 China Macedonian Academy of Sciences and Arts P.O.B. 428 1000 Skopje Macedonia The National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China

This paper studies the process of mutual neutralization of Si^＋ and H^- ions in slow collisions within the multichannel Landau-Zener model. All important ionic-covalent couplings in this collision system are included in the collision dynamics. The cross sections for population of specific final states of product Si atom are calculated in the CM energy range 0.05 e∨/u-5 ke∨/u. Both singlet and triplet states are considered. At collision energies below -10 e∨/u, the most populated singlet state is Si（3p4p, ^1S0）, while for energies above -150e∨/u it is the Si（3p, 4p, ^1P1） state. In the case of triplet states, the mixed 3p4p（^3S1 ＋^3P0） states are the most populated in the entire collision energy range investigated. The total cross section exhibits a broad maximum around 200 300e∨/u and for ECM ≤ 10e∨/u it monotonically increases with decreasing the collision energy, reaching a value of 8 × 10^-13 cm^2 at ECM = 0.05 e∨/u. The ion-pair formation process in Si（3p^2 ^3PJ）＋H（1s） collisions has also been considered and its cross section in the considered energy range is very small （smaller than 10^-20 cm^2 in the energy region below 1 ke∨/u）.

关键词： multi-channel Landau-Zener model slow collision mutual neutralization

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