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LETTER TO THE EDITOR: Observation of ? and ? inner-shell doubly excited states 给编辑的信:观察到什么?然后呢?内层双激发态
Journal of Physics B Pub Date : 1996-10-28 DOI: 10.1088/0953-4075/29/20/003
L. Avaldi, R. Camilloni, G. Stefani, C. Comicioli, M. Zacchigna, K. Prince, M. Zitnik, C. Quaresima, C. Ottaviani, C. Crotti, P. Perfetti
{"title":"LETTER TO THE EDITOR: Observation of ? and ? inner-shell doubly excited states","authors":"L. Avaldi, R. Camilloni, G. Stefani, C. Comicioli, M. Zacchigna, K. Prince, M. Zitnik, C. Quaresima, C. Ottaviani, C. Crotti, P. Perfetti","doi":"10.1088/0953-4075/29/20/003","DOIUrl":"https://doi.org/10.1088/0953-4075/29/20/003","url":null,"abstract":"The photoabsorption spectra of neon and argon in the energy region of the and doubly excited states have been studied. The resolution and flux of the new VUV undulator beam line at ELETTRA allowed the resolution of new features for Ne and the first observation for Ar. A comparison of the measured photoabsorption spectra and of the threshold photoelectron spectra in the energy region of the and satellite states provides information on the decay routes of the inner-shell doubly excited states.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1996-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79514939","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: 10
The - resonance line in neutral beryllium 中性铍中的共振线
Journal of Physics B Pub Date : 1996-10-14 DOI: 10.1088/0953-4075/29/19/009
J. Fleming, M. Godefroid, K. Bell, A. Hibbert, N. Vaeck, J. Olsen, P. Jönsson, C. Fischer
{"title":"The - resonance line in neutral beryllium","authors":"J. Fleming, M. Godefroid, K. Bell, A. Hibbert, N. Vaeck, J. Olsen, P. Jönsson, C. Fischer","doi":"10.1088/0953-4075/29/19/009","DOIUrl":"https://doi.org/10.1088/0953-4075/29/19/009","url":null,"abstract":"The oscillator strength of the resonance transition - in neutral beryllium is evaluated using two independent codes: CIV3 and MCHF. Two separate approaches are executed using the code CIV3, which uses a common set of orbitals, the inclusion of valence, core - valence and core - core correlation being approached in different ways. In the MCHF scheme, the wavefunctions of the two states are optimized independently. The convergence of the MCHF results with respect to the addition of orbital functions is considered in some detail. This convergence, together with the results of the CIV3 calculations, lead us to recommend a value of 1.375 for the oscillator strength, with an estimated uncertainty of less than 0.5%. This agrees closely with other recent extensive calculations but is 2.5% higher than the value derived from beam-foil experiments.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"126 1","pages":"4347-4363"},"PeriodicalIF":0.0,"publicationDate":"1996-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79184097","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: 12
Sr ( J= 1,3) autoionizing states Sr (J= 1,3)自电离态
Journal of Physics B Pub Date : 1996-06-28 DOI: 10.1088/0953-4075/29/12/011
C. Dai, J. Lu
{"title":"Sr ( J= 1,3) autoionizing states","authors":"C. Dai, J. Lu","doi":"10.1088/0953-4075/29/12/011","DOIUrl":"https://doi.org/10.1088/0953-4075/29/12/011","url":null,"abstract":"Using the isolated-core-excitation scheme we have measured the energies and widths, as well as resonance profiles of the Sr 5 (J = 1,3) autoionizing Rydberg states for . We have characterized the excitation spectra by the sum of two Lorentzians extracting the observed energies and widths. The manifestations involved in the spectra are interpreted in detail. Some of the J = 3 data are compared with the available ones, and good agreement between them is achieved.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"30 1","pages":"2473-2484"},"PeriodicalIF":0.0,"publicationDate":"1996-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79295938","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
Study of electron scattering by N2O using the polyatomicR-matrix method 用多原子基法研究N2O的电子散射
Journal of Physics B Pub Date : 1996-05-14 DOI: 10.1088/0953-4075/29/9/030
B. Sarpal, Kurt Pfingst, B. Nestmann, S. Peyerimhoff
{"title":"Study of electron scattering by N2O using the polyatomicR-matrix method","authors":"B. Sarpal, Kurt Pfingst, B. Nestmann, S. Peyerimhoff","doi":"10.1088/0953-4075/29/9/030","DOIUrl":"https://doi.org/10.1088/0953-4075/29/9/030","url":null,"abstract":"","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"1 1","pages":"1877-1877"},"PeriodicalIF":0.0,"publicationDate":"1996-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84574029","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
LETTER TO THE EDITOR: Trends in valence autoionizing Rydbergs for ? semifilled-shell ground and excited atoms and ions: ? and Re 致编辑的信:价自离里德堡的发展趋势?半填充壳层基态和激发态原子和离子:?和再保险
Journal of Physics B Pub Date : 1996-04-28 DOI: 10.1088/0953-4075/29/8/001
V. Dolmatov, M. M. Mansurov
{"title":"LETTER TO THE EDITOR: Trends in valence autoionizing Rydbergs for ? semifilled-shell ground and excited atoms and ions: ? and Re","authors":"V. Dolmatov, M. M. Mansurov","doi":"10.1088/0953-4075/29/8/001","DOIUrl":"https://doi.org/10.1088/0953-4075/29/8/001","url":null,"abstract":"New regularities are reported for valence-shell autoionizing Rydbergs decaying to a continuous spectrum of the valence subshell of free metal atoms and ions with semifilled subshells: , , and . We predict an extreme narrowing for the autoionizing Rydbergs in the atoms and ions with a ground-state valence-shell configuration. In contrast, incomparably broader Rydbergs occur in both atoms and ions with a ground configuration , or in metastable atoms and ions whose electron configuration is . We also predict a drastic difference between the Rydberg profiles in partial and photoionization cross sections of the atoms and ions with a closed valence subshell (arrows and show the two possible spin orientations for the ejected photoelectrons). The regularities disappear for atoms and ions with other than an semifilled subshell. The research is performed within both the `spin-polarized' Hartree - Fock approach and the `spin-polarized' random-phase approximation with exchange.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1996-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76518779","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
Measurement of wavelengths in helium-like sulphur 测量类氦硫的波长
Journal of Physics B Pub Date : 1996-03-14 DOI: 10.1088/0953-4075/29/5/007
D. J. H. Howie, J. Silver, E. G. Myers
{"title":"Measurement of wavelengths in helium-like sulphur","authors":"D. J. H. Howie, J. Silver, E. G. Myers","doi":"10.1088/0953-4075/29/5/007","DOIUrl":"https://doi.org/10.1088/0953-4075/29/5/007","url":null,"abstract":"We have used photographic spectroscopy of a beam - foil source to measure the vacuum ultraviolet 1s2s - 1s2p transition wavelengths in helium-like sulphur. The results are A and A, respectively. These measurements, together with our earlier measurements in helium-like silicon and phosphorus, are compared with other precision measurements for Z = 14 to 18, and with recent relativistic and quantum electrodynamic calculations.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"1 1","pages":"927-936"},"PeriodicalIF":0.0,"publicationDate":"1996-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79560226","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: 5
Failure to observe electron circular dichroism in camphor 未能观察到樟脑的电子圆二色性
Journal of Physics B Pub Date : 1995-09-14 DOI: 10.1088/0953-4075/28/17/004
K. Trantham, M. Johnston
{"title":"Failure to observe electron circular dichroism in camphor","authors":"K. Trantham, M. Johnston","doi":"10.1088/0953-4075/28/17/004","DOIUrl":"https://doi.org/10.1088/0953-4075/28/17/004","url":null,"abstract":"We have searched for evidence of electron circular dichroism, Lhe Preferential transmission of longirudinally polarized electrons lhrough a chiral medium, using stereoisomers of camphor. Such an effect was seen by Campbell and Farago in 1987 for 5 eV elecvons. Within OUT detection limit (- 0.02%) we have not observed asymmehic transmission at either an incident electron energy of 1 eV or 5 eV. ln preption for this inquiry, we also measured the total sanering cross section for camphor in the energy range 0.5-5 eV. Optical activity is the rotation of the plane of polarization of linearly polarized light as it passes through a chiral medium. A complementary phenomenon is circular dichroism: the preferential absorption of left- or right-handed circularly polarized light in a chiral medium. Farago (1980, 1981) pointed out that symmetry allows similar phenomena to be observed with electrons. Thus 'electron optical activity' is the rotation of a transverse electron spin vector in a plane perpendicular to the momentum in a chiral medium. Similarly, 'electron circular dichroism' is the preferential absorption of left- or right-handed longitudinally- polarized electrons in a vapour of chiral molecules. These parity violating effects arise because the target molecule lacks inversion symmetry. Electron circular dichroism also causes scattered electrons that were initially unpolarized to develop a polarization component in the plane of scattering. Beerlage ef al (1981) first searched for this effect but failed to see it within their experimental limits. A different experiment, performed by Campbell and Farago (1987). looked for preferential transmission of longitudinally polarized electrons through stereoisomers of camphor. They measured the mymetry","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1995-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75199886","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: 12
Predissociation of the A 2Sigma+, C 2Sigma+ and D 2Sigma+ levels of 4HeH from a multistate close-coupling scattering approach 用多态紧密耦合散射方法预解4HeH的a2sigma +， c2sigma +和d2sigma +能级
Journal of Physics B Pub Date : 1995-07-28 DOI: 10.1088/0953-4075/28/14/014
A. Vegiri, C. Nicolaides
{"title":"Predissociation of the A 2Sigma+, C 2Sigma+ and D 2Sigma+ levels of 4HeH from a multistate close-coupling scattering approach","authors":"A. Vegiri, C. Nicolaides","doi":"10.1088/0953-4075/28/14/014","DOIUrl":"https://doi.org/10.1088/0953-4075/28/14/014","url":null,"abstract":"We have implemented a multistate close-coupling scattering approach to the calculation of the positions and partial and total widths of the rovibrational levels of the 2Sigma+ states of the 4HeH excimer molecule. Good agreement with available experimental data is obtained while a number of predictions are made. The results of the present multistate approach (MSA) are compared to those of the two-state approach (TSA), previously applied by a number of methods. Only for the lowest bound excited state, the A 2Sigma+, is there agreement, signifying the dominance of the A-X 2Sigma+ interaction. For the higher lying C and D 2Sigma+ states, the MSA produces significantly different results. The same should apply to similar situations in other excimer spectra.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"8 1","pages":"2927-2939"},"PeriodicalIF":0.0,"publicationDate":"1995-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87831536","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
Stability properties of CO22 CO22的稳定性
Journal of Physics B Pub Date : 1995-04-28 DOI: 10.1088/0953-4075/28/8/001
H. Hogreve
{"title":"Stability properties of CO22","authors":"H. Hogreve","doi":"10.1088/0953-4075/28/8/001","DOIUrl":"https://doi.org/10.1088/0953-4075/28/8/001","url":null,"abstract":"The carbon dioxide molecular dication is investigated by multireference configuration interaction computations. Whereas the system is found to be unbound by De=-5.12 eV with respect to fragmentation into CO+(2 Sigma +)+O+(4Su), the ground-state potential energy surface of CO22+ enjoys a local minimum for a collinear symmetric configuration where the carbon nucleus is centred between the outer two oxygen nuclei (with internuclear separation RC-O=1.22 AA). Potential barriers larger than 1 eV render the corresponding electronic ground state 3 Sigma g- metastable against dissociative tunnelling. For the lowest seven excited states and system configurations restricted to linear symmetric geometries, potential energy curves are presented and compared with the experimental double ionization spectrum of CO2 in the Franck-Condon region.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"75 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1995-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78581065","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: 19
Hyperfine splitting computation in the 1s1/2(e)2s1/2(mu) state of the exotic (4He2+ - mu-e-)0 and (3He2+ - mu-e-)0 atoms 外来原子(4He2+ - mu-e-)0和(3He2+ - mu-e-)0的1s /2(e)2s /2(mu)态的超精细分裂计算
Journal of Physics B Pub Date : 1994-08-28 DOI: 10.1088/0953-4075/27/16/021
V. Yakhontov, M. Amusia
{"title":"Hyperfine splitting computation in the 1s1/2(e)2s1/2(mu) state of the exotic (4He2+ - mu-e-)0 and (3He2+ - mu-e-)0 atoms","authors":"V. Yakhontov, M. Amusia","doi":"10.1088/0953-4075/27/16/021","DOIUrl":"https://doi.org/10.1088/0953-4075/27/16/021","url":null,"abstract":"An ab initio calculation of the hyperfine splitting (HFS) intervals in the 2s1/2(mu)1s1/2(e) state of the exotic (4He2+ - mu-e-)0 and (3He2+ - mu-e-)0 atoms is carried out. The smallness of beta = me/mmu approximately 1/200 (the electron and the mu-meson mass ratio) enables us to take into account the non-relativistic interparticle correlational interaction perturbatively. Corresponding corrections, which give the dominant contribution to the HFS, are calculated to logarithmic accuracy analytically and exactly. Together with the leading relativistic and radiative corrections the HFS values obtained turn out to be in accord with the results of other calculations.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"27 1","pages":"3743-3765"},"PeriodicalIF":0.0,"publicationDate":"1994-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81683575","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: 15
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