Journal of Physics B最新文献_第10页

Electron-impact excitation of the ns[3/2]oJ=2,1 and ns'[ 1/2]oJ=0,1 levels of Ne, Ar, Kr and Xe Ne、Ar、Kr和Xe的ns[3/2]oJ=2,1和ns'[1/2]oJ=0,1能级的电子碰撞激发

Journal of Physics B Pub Date : 1994-07-28 DOI: 10.1088/0953-4075/27/14/045

M. Khakoo, C. Beckmann, S. Trajmar, G. Csanak

{"title":"Electron-impact excitation of the ns[3/2]oJ=2,1 and ns'[ 1/2]oJ=0,1 levels of Ne, Ar, Kr and Xe","authors":"M. Khakoo, C. Beckmann, S. Trajmar, G. Csanak","doi":"10.1088/0953-4075/27/14/045","DOIUrl":"https://doi.org/10.1088/0953-4075/27/14/045","url":null,"abstract":"Relative differential cross sections for electron-impact excitation of the four lowest electronic levels ns[3/2]oJ=2 and 1 ns'[1/2]oJ=0 and 1 were measured for Ne, Ar, Kr and Xe at 30 eV impact energy and for Kr and Xe at 20 eV impact energy for a range of scattering angles from 0 degrees to 134 degrees . The aim of the present work was: to improve the quality of existing data, to extend the measurements to small scattering angles, to determine whether statistical weight (branching) ratios represent the ns[3/2]o2 to ns'[1/2]o DCS ratios (r) and to compare the experimental results with the predictions of non-relativistic and relativistic first-order scattering theories. We found that the experimental ratios r closely correspond to statistical weight ratios for Ne and Ar at all scattering angles, for Kr at most angles, but seriously deviate from statistical weight ratios for Xe at all angles. First-order scattering theories yield good and reasonable predictions for Ne, Ar and Kr, respectively. For Xe theories also predict significant deviations from statistical weight ratios but there is no agreement between experiment and theory. Surprisingly, the DCS ratios (r') obtained for the ns[3/2]o1, and ns'[1/2]o1, levels by experiment and various first-order theories deviate significantly for all rare-gas species. It is also surprising that the fully relativistic first-order theory does not show improved agreement between experiment and theory in the case of Xe.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"126 2 1","pages":"3159-3174"},"PeriodicalIF":0.0,"publicationDate":"1994-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77879238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 40

Calculations of 5dN-16s systems using orthogonal operators: do orthogonal operators survive configuration interaction? 5dN-16s系统的正交算符计算:正交算符能在组态交互中存活吗?

Journal of Physics B Pub Date : 1993-12-28 DOI: 10.1088/0953-4075/26/24/004

P. Uylings, A. Raassen, J. Wyart

引用次数: 30

Low energy electron impact spectra of the van der Waals clusters Xe2 and Xen (n approximately 3,4) 范德华星团Xe2和Xen的低能电子碰撞能谱(n约为3,4)

Journal of Physics B Pub Date : 1993-02-14 DOI: 10.1088/0953-4075/26/3/007

M. Allan

引用次数: 7

Total cross sections for K-K electron transfer in fast ion-atom collisions: the impulse and strong potential Born approximations 离子-原子快速碰撞中K-K电子转移的总横截面:脉冲和强势玻恩近似

Journal of Physics B Pub Date : 1992-09-28 DOI: 10.1088/0953-4075/25/18/010

H. Marxer, J. Briggs

引用次数: 8

Investigation of thermal and collisional effects on IRMPA and IRMPD of SF6 via a combined model involving rotationally resolved coherent-incoherent interface and quasicontinuum 基于旋转分辨相干-非相干界面和准连续体的组合模型研究SF6的IRMPA和IRMPD的热和碰撞效应

Journal of Physics B Pub Date : 1992-06-14 DOI: 10.1088/0953-4075/25/11/009

S. Mitra, S. Bhattacharyya

引用次数: 4

Recoil-ion momentum spectroscopy 反冲离子动量谱

Journal of Physics B Pub Date : 1991-10-01 DOI: 10.1088/0953-4075/30/13/006

J. Ullrich, R. Moshammer, R. Dörner, O. Jagutzki, V. Mergel, H. Schmidt-Böcking, L. Spielberger

{"title":"Recoil-ion momentum spectroscopy","authors":"J. Ullrich, R. Moshammer, R. Dörner, O. Jagutzki, V. Mergel, H. Schmidt-Böcking, L. Spielberger","doi":"10.1088/0953-4075/30/13/006","DOIUrl":"https://doi.org/10.1088/0953-4075/30/13/006","url":null,"abstract":"High-resolution recoil-ion momentum spectroscopy (RIMS) is a novel technique to determine the charge state and the complete final momentum vector of a recoiling target ion emerging from an ionizing collision of an atom with any kind of radiation. It offers a unique combination of superior momentum resolution in all three spatial directions of with a large detection solid angle of . Recently, low-energy electron analysers based on rigorously new concepts and reaching similar specifications were successfully integrated into RIM spectrometers yielding so-called `reaction microscopes'. Exploiting these techniques, a large variety of atomic reactions for ion, electron, photon and antiproton impact have been explored in unprecedented detail and completeness. Among them kinematically complete experiments on electron capture, single and double ionization in ion - atom collisions at projectile energies between 5 keV and 1.4 GeV have been carried out. Double photoionization of He has been investigated at energies close to the threshold up to . At the contributions to double ionization after photoabsorption and Compton scattering were separated kinematically for the first time. These and many other results will be reviewed in this paper. In addition, the experimental technique is described in some detail and emphasis is given to envisaging the rich future potential of the method in various fields of atomic collision physics with atoms, molecules and clusters.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"77 2-3 1","pages":"2917-2974"},"PeriodicalIF":0.0,"publicationDate":"1991-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77891484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 358

Electron capture by multiply charged ions on helium target a population mechanism for minor channels 氦靶上多电荷离子的电子捕获是一种次要通道的居群机制

Journal of Physics B Pub Date : 1990-04-14 DOI: 10.1088/0953-4075/23/7/017

Philippe Roncin, M. N. Gaboriaud, L. Guillemot, H. Laurent, S. Ohtani, M. Barat

引用次数: 9

An alternative proof of some relations between hydrogenic matrix elements 氢矩阵元素间某些关系的另一种证明

Journal of Physics B Pub Date : 1990-04-14 DOI: 10.1088/0953-4075/23/7/005

R. A. Swainson, G. Drake

引用次数: 14

Rate constants for deactivation of N2* (A3Σu+, nu =0, 1) by H and D atoms H和D原子使N2* (A3Σu+， nu = 0,1)失活的速率常数

Journal of Physics B Pub Date : 1989-10-14 DOI: 10.1088/0953-4075/22/19/015

M. Kubo, M. Kogoma, T. Moriwaki, S. Okazaki

引用次数: 6

The Sommerfeld screening parameter σ2 and theoretically calculated energies of atomic inner shells 索默菲尔德筛选参数σ2和原子内壳层能量的理论计算

Journal of Physics B Pub Date : 1989-05-28 DOI: 10.1088/0953-4075/22/10/007

U. D. Misra, M. Sah, B. G. Gokhale

{"title":"The Sommerfeld screening parameter σ2 and theoretically calculated energies of atomic inner shells","authors":"U. D. Misra, M. Sah, B. G. Gokhale","doi":"10.1088/0953-4075/22/10/007","DOIUrl":"https://doi.org/10.1088/0953-4075/22/10/007","url":null,"abstract":"Using the recent theoretical atomic energy values of Huang et al. (1976), the values of the Sommerfeld screening parameter sigma 2 have been calculated for those spin doublet levels where calculations could not formerly be performed owing to the lack of experimental energy values. The method used was described earlier by Burr and Carson (1974) and involves no errors arising from the truncation of the series expansion of the Sommerfeld-Dirac relativistic energy expression. It is found that: (i) sigma 2 is a function of Z for all the spin doublets studied; (ii) the sigma 2 values calculated smoothly fit in the gaps in the sigma 2 against Z curves drawn by Burr and Carson; (iii) the sigma 2 values which show excessive scattering in the sigma 2 against Z curves drawn by Burr and Carson have been recalculated and are found to fit much better in the sigma 2 against Z curves; (iv) there exists a dip in the sigma 2 values in the regions of inner-shell filling (3d,4d, 4f,5d etc.) for all the doublets studied; (v) the sigma 2 values become negative for Z=22-25 (3d filling region) for the M2M3 spin doublet; and (vi) comparison of the sigma 2 against Z curves obtained by using the experimental energy values on the one hand, and the Huang et al. theoretical energy values on the other hand shows that the dips are quite pronounced in the latter case.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"39 1","pages":"1505-1513"},"PeriodicalIF":0.0,"publicationDate":"1989-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83265339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2