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Spin-polarised electron studies of low-dimensional magnetic systems 低维磁系统的自旋极化电子研究
Australian Journal of Physics Pub Date : 1999-06-01 DOI: 10.1071/PH99006
M. Donath
{"title":"Spin-polarised electron studies of low-dimensional magnetic systems","authors":"M. Donath","doi":"10.1071/PH99006","DOIUrl":"https://doi.org/10.1071/PH99006","url":null,"abstract":"Spin-polarised electrons provide unique experimental access to magnetic properties of surfaces and layered structures. The combined use of different techniques allows us to develop a microscopic picture of the physics underlying the macroscopic magnetic properties, e.g. magnetic phase transitions, magnetic coupling phenomena, exceptional surface magnetic properties. In this paper, two techniques are described together with the kind of questions addressed by them. Spin-resolved appearance potential spectroscopy gives local magnetic information about multi-component systems by probing the spin-dependent local density of unoccupied states. Spin-resolved inverse photo-emission measures specific electron states above the Fermi level. In particular, two-dimensional states serve as magnetic sensors at surfaces. Examples from surfaces as well as thin-film structures of band and local-moment ferromagnets are presented.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127950862","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: 4
Threshold behaviour of (e,2e) reactions in classical and quantum mechanics 经典和量子力学中(e,2e)反应的阈值行为
Australian Journal of Physics Pub Date : 1999-06-01 DOI: 10.1071/PH98091
H. Friedrich, W. Ihra, P. Meerwald
{"title":"Threshold behaviour of (e,2e) reactions in classical and quantum mechanics","authors":"H. Friedrich, W. Ihra, P. Meerwald","doi":"10.1071/PH98091","DOIUrl":"https://doi.org/10.1071/PH98091","url":null,"abstract":"Electron impact ionisation of one-electron atoms or ions is well described in the near threshold region by Wannier’s theory based on estimating the classical phase space available to two outgoing electrons in the Coulomb field of the residual ion. The relation between classical dynamics and quantum mechanics in the near threshold region becomes more complicated and interesting in ‘non-Wannier situations’, where classical ionisation is either strictly forbidden or strongly inhibited. This paper focusses on two examples of such situations, which have been receiving increasing attention in recent years, namely the s-wave model and the case where the exponent in Wannier\"s law diverges.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"228 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133725292","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: 7
Role of negative ion resonances in electron scattering from atoms and molecules 负离子共振在原子和分子电子散射中的作用
Australian Journal of Physics Pub Date : 1999-06-01 DOI: 10.1071/PH99051
S. Buckman, D. T. Alle, M. Brennan, P. Burrow, J. C. Gibson, R. J. Gulley, M. Jacka, D. Newman, A. Rau, J. Sullivan, K. Trantham
{"title":"Role of negative ion resonances in electron scattering from atoms and molecules","authors":"S. Buckman, D. T. Alle, M. Brennan, P. Burrow, J. C. Gibson, R. J. Gulley, M. Jacka, D. Newman, A. Rau, J. Sullivan, K. Trantham","doi":"10.1071/PH99051","DOIUrl":"https://doi.org/10.1071/PH99051","url":null,"abstract":"Transient negative ions (resonances) formed during the collision of an electron with an atom or molecule have been extensively studied for over thirty years. The continued interest in these states, both experimentally and theoretically, stems from the profound effects that they can have on electron scattering cross sections and the role that electron–electron correlations play in their formation and quasi-stability. A selective discussion of examples of such resonances, involving one, two and three excited electrons is given for a wide range of atomic and molecular systems.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"519 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134315700","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: 13
Multiple ionisation and fragmentation of molecules 分子的多次电离和分裂
Australian Journal of Physics Pub Date : 1999-06-01 DOI: 10.1071/PH98089
B. Siegmann, U. Werner, H. Lutz
{"title":"Multiple ionisation and fragmentation of molecules","authors":"B. Siegmann, U. Werner, H. Lutz","doi":"10.1071/PH98089","DOIUrl":"https://doi.org/10.1071/PH98089","url":null,"abstract":"The multiple ionisation and dissociation of molecules, e.g. H2, N2, H2O, CH4 and C60, by fast ions was studied using a position- and time-sensitive multi-particle detector. The data obtained allow a clear separation of various reaction channels. Of special interest are the ‘Coulomb explosion’ processes like N2 → Nq+ +Nn+ or H2O → H+ + H+ +On+. For these reactions the coincident measurement of the momenta of correlated fragment ion yields a kinematically complete image of the molecular break-up process, and the fragmentation energy as well as angular correlations can be derived for each individual event. In the case of H2 as target molecule the CE model describes the fragmentation energy rather well, whereas in the case of more complex molecules, e.g. N2, CO and CH4, the simple CE model is insufficient to explain the measured energy and angular spectra. Better agreement was achieved with ab initio MCSCF calculations which take into account several molecular states of the fragmenting highly charged molecular ion.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131948144","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: 8
Time-dependent approach to positron-hydrogen scattering 正电子-氢散射的时间依赖方法
Australian Journal of Physics Pub Date : 1999-06-01 DOI: 10.1071/PH98101
Jingbo Wang, Neil Riste, S. Midgley, A. Stelbovics, James Williams
{"title":"Time-dependent approach to positron-hydrogen scattering","authors":"Jingbo Wang, Neil Riste, S. Midgley, A. Stelbovics, James Williams","doi":"10.1071/PH98101","DOIUrl":"https://doi.org/10.1071/PH98101","url":null,"abstract":"This paper examines the positron–hydrogen scattering process by numerically solving the time-dependent Schrodinger equation in the s-wave model. The overall behaviour of the system wavefunction as it propagates through the collision region is studied above the positronium formation threshold and is found to match expectations qualitatively.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130922681","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: 3
Helium double photoionisation and Compton scattering: a showcase for electron correlation 氦双光离和康普顿散射:电子相关的展示
Australian Journal of Physics Pub Date : 1999-06-01 DOI: 10.1071/PH98116
U. Becker, G. Prümper, B. Langer, J. Viefhaus, M. Wiedenhöft, J. Levin, I. Sellin
{"title":"Helium double photoionisation and Compton scattering: a showcase for electron correlation","authors":"U. Becker, G. Prümper, B. Langer, J. Viefhaus, M. Wiedenhöft, J. Levin, I. Sellin","doi":"10.1071/PH98116","DOIUrl":"https://doi.org/10.1071/PH98116","url":null,"abstract":"The present status of double photoionisation studies is comprehensively reviewed. Recent findings are described which shed some light on the transition from the correlated motion of the two electrons near threshold to the shakeoff-like behaviour at higher photon energies. For extremely high photon energies, where Compton scattering becomes the dominant process, new results for the He2+ /He+ ratio between 6 and 120 keV are presented. The results confirm the prediction of Bergstrom et al. that the ratio reaches an intermediate maximum between 12 and 15 keV, before declining towards the asymptotic limit. Furthermore, this asymptotic limit seems not to be reached even at energies as high as 120 keV.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134015482","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: 7
Some recent developments in the photoelectron spectroscopy of solids 固体光电子能谱的最新进展
Australian Journal of Physics Pub Date : 1999-06-01 DOI: 10.1071/PH98079
R. Leckey
{"title":"Some recent developments in the photoelectron spectroscopy of solids","authors":"R. Leckey","doi":"10.1071/PH98079","DOIUrl":"https://doi.org/10.1071/PH98079","url":null,"abstract":"A selective review of some recent achievements in the general area of the photoelectron spectroscopy of solids is presented emphasising full hemisphere data collection. The current state of development of both surface structure and electronic band structure determinations is illustrated with an emphasis on materials for which electron correlation effects are significant.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128735687","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: 0
Discretisation errors in Landau gauge on the lattice 格上朗道规的离散误差
Australian Journal of Physics Pub Date : 1999-05-06 DOI: 10.1071/PH99047
F. Bonnet, P. Bowman, D. Leinweber, A. Williams, D. Richards
{"title":"Discretisation errors in Landau gauge on the lattice","authors":"F. Bonnet, P. Bowman, D. Leinweber, A. Williams, D. Richards","doi":"10.1071/PH99047","DOIUrl":"https://doi.org/10.1071/PH99047","url":null,"abstract":"Lattice discretization errors in the Landau gauge condition are examined. An improved gauge fixing algorithm in which O(a{sup 2}) errors are removed is presented. O(a{sup 2}) improvement of the gauge fixing condition improves comparison with continuum Landau gauge in two ways: (1) through the elimination of O(a{sup 2}) errors and (2) through a secondary effect of reducing the size of higher-order errors. These results emphasize the importance of implementing an improved gauge fixing condition.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121299354","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: 28
Electron acceleration by a laser pulse with a rising propagation speed 传播速度上升的激光脉冲对电子的加速
Australian Journal of Physics Pub Date : 1999-05-01 DOI: 10.1071/P98086
C. Du, Zhi‐zhan Xu
{"title":"Electron acceleration by a laser pulse with a rising propagation speed","authors":"C. Du, Zhi‐zhan Xu","doi":"10.1071/P98086","DOIUrl":"https://doi.org/10.1071/P98086","url":null,"abstract":"The acceleration of an electron by a circularly polarised laser pulse propagating at a time-rising speed in a plasma is studied. The limitation on the electron energy gain due to dephasing may disappear. The characteristics of this non-dephasing direct acceleration scheme are analysed.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115403799","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: 0
Self-assembly, stability and the electrical characteristics of cell membranes 细胞膜的自组装、稳定性和电特性
Australian Journal of Physics Pub Date : 1999-05-01 DOI: 10.1071/P98088
H. Coster
{"title":"Self-assembly, stability and the electrical characteristics of cell membranes","authors":"H. Coster","doi":"10.1071/P98088","DOIUrl":"https://doi.org/10.1071/P98088","url":null,"abstract":"Living cells are enveloped in an ultra thin ( ~ 6 nm) membrane which consists basically of a bi-molecular film of lipid molecules in which are embedded functional proteins that perform a variety of functions, including energy transduction, signalling, transport of ions (and other molecules) etc., and also acts as a diffusion barrier between the cell interior (cytoplasm) and the external medium. A simple statistical mechanical analysis of the self-assembly of the membrane from its components provides useful insights into the molecular organisation of the membrane and its electrical properties. The stability of the structure is also closely connected to its electrical properties and this has provided not only a useful tool for fundamental research but has spawned also applications, some of which have had a major impact in biomedical research and are now being exploited commercially. An overview is given of the rapid progress made in our understanding of the physics of both the molecular organisation and function of cell membranes and some of the fascinating and socially and commercially important applications that have flowed from this.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132910631","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: 14
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