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The - intercombination line in the Be-like sequence 类贝序列中的-组合线
Journal of Physics B Pub Date : 1997-08-14 DOI: 10.1088/0953-4075/30/15/006
C. Fischer, G. Gaigalas, M. Godefroid
{"title":"The - intercombination line in the Be-like sequence","authors":"C. Fischer, G. Gaigalas, M. Godefroid","doi":"10.1088/0953-4075/30/15/006","DOIUrl":"https://doi.org/10.1088/0953-4075/30/15/006","url":null,"abstract":"Results from systematic multiconfiguration Hartree - Fock studies of the - transitions in the Be-like sequence in the range of Z = 4 - 10 are reported for valence and core-valence models of correlation. The inclusion of core - valence correlation was essential for obtaining good agreement for the fine-structure splitting. The most accurate transition rates are in good agreement with the rates predicted from a semi-empirical analysis of experimental data.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"9 1","pages":"3333-3342"},"PeriodicalIF":0.0,"publicationDate":"1997-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86177387","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
photodissociation in an intense infrared light field 强红外光场中的光解作用
Journal of Physics B Pub Date : 1997-06-28 DOI: 10.1088/0953-4075/30/12/012
H. Rottke, J. Ludwig, W. Sandner
{"title":"photodissociation in an intense infrared light field","authors":"H. Rottke, J. Ludwig, W. Sandner","doi":"10.1088/0953-4075/30/12/012","DOIUrl":"https://doi.org/10.1088/0953-4075/30/12/012","url":null,"abstract":"The first experiment on infrared (IR) multiphoton excitation of with single rotational levels as initial states is reported. These states are prepared by one-photon excitation from the molecular ground state. We investigate the and ion yield, the dissociation fraction and the ion kinetic energy distribution as a function of the IR light intensity in the range from up to . The dissociation fraction depends sensitively on the initial rotational state. Transient resonances induced by AC Stark shifting states seem to influence the branching ratio between photoionization and dissociation. The photoion kinetic energy distributions show that the molecule dissociates after three-photon absorption into . The atoms are then photoionized. The AC Stark shift of the final dissociation product states in the IR light field seems to be responsible for a small intensity-dependent shift of the kinetic energy distribution.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"30 1","pages":"2835-2844"},"PeriodicalIF":0.0,"publicationDate":"1997-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75425774","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
Relative intensities and of Yb by impact of 1.0 - 8.5 MeV ions 在1.0 - 8.5兆电子伏特离子的冲击下，Yb的相对强度和变化
Journal of Physics B Pub Date : 1997-06-28 DOI: 10.1088/0953-4075/30/12/008
A. Hallak
{"title":"Relative intensities and of Yb by impact of 1.0 - 8.5 MeV ions","authors":"A. Hallak","doi":"10.1088/0953-4075/30/12/008","DOIUrl":"https://doi.org/10.1088/0953-4075/30/12/008","url":null,"abstract":"The PIXE spectra resulting from ion beam bombardment in the energy range of 1.0 - 8.5 MeV of a thin target of ytterbium were measured to obtain the relative intensity and of L-shell lines. The results are compared with the calculated L-shell line intensities for helium ion impact in the ECPSSR theory. Modifications of the theory for intra-shell coupling were also calculated and compared with the measured intensities. Good agreement between experimental results and theoretical calculations was found for ion energies greater than 4 MeV. Possible reasons for the discrepancies observed at energies less than 4 MeV were discussed in the framework of the L-subshell coupling effect and binding energy corrections in the united-atom modifications of the ECPSSR theory.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"2 1","pages":"2781-2787"},"PeriodicalIF":0.0,"publicationDate":"1997-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84614393","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: 6
Single ionization of He by ions 氦离子的单电离
Journal of Physics B Pub Date : 1997-05-28 DOI: 10.1088/0953-4075/30/10/017
S. O'Rourke, D. Crothers
{"title":"Single ionization of He by ions","authors":"S. O'Rourke, D. Crothers","doi":"10.1088/0953-4075/30/10/017","DOIUrl":"https://doi.org/10.1088/0953-4075/30/10/017","url":null,"abstract":"The final state longitudinal momentum distributions of the ejected electron, recoil ion and the projectile momentum transfer for are calculated within the continuum distorted-wave (CDW) model at an impact energy of . The results are discussed in the context of recent CDW eikonal-initial state calculations (CDW-EIS) and are compared with available experimental data. The calculated electron energy spectrum and total ionization cross sections within the CDW approximation are in good agreement with both the measurement and the theoretical CDW-EIS calculations.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"29 1","pages":"2443-2454"},"PeriodicalIF":0.0,"publicationDate":"1997-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82914773","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
LETTER TO THE EDITOR: Vacuum ultraviolet oscillator strengths of iodine atoms in the ? and ? states 致编辑的信:真空紫外振荡器中碘原子的强度?然后呢?州
Journal of Physics B Pub Date : 1997-04-28 DOI: 10.1088/0953-4075/30/8/001
A. Baklanov, L. Karlsson, B. Lindgren, U. Sassenberg
{"title":"LETTER TO THE EDITOR: Vacuum ultraviolet oscillator strengths of iodine atoms in the ? and ? states","authors":"A. Baklanov, L. Karlsson, B. Lindgren, U. Sassenberg","doi":"10.1088/0953-4075/30/8/001","DOIUrl":"https://doi.org/10.1088/0953-4075/30/8/001","url":null,"abstract":"Integral cross sections of the absorption of the ground and excited fine-structure states of atomic iodine have been measured for four transitions in the VUV region: and . The oscillator strengths derived for these transitions are: and , respectively.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1997-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84441514","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
Polarized light emission during very slow ? - Li(2s) collisions (?) 偏振光发射期间很慢吗?- Li(2s)碰撞(?)
Journal of Physics B Pub Date : 1997-03-28 DOI: 10.1088/0953-4075/30/6/019
C. Laulhé, E. Jacquet, P. Boduch, M. Chantepie, G. Cremer, N. Gherardi, X. Husson, D. Lecler, J. Pascale
{"title":"Polarized light emission during very slow ? - Li(2s) collisions (?)","authors":"C. Laulhé, E. Jacquet, P. Boduch, M. Chantepie, G. Cremer, N. Gherardi, X. Husson, D. Lecler, J. Pascale","doi":"10.1088/0953-4075/30/6/019","DOIUrl":"https://doi.org/10.1088/0953-4075/30/6/019","url":null,"abstract":"We report on the polarization of lines emitted by excited ions produced by the single-electron capture process during collisions at very low impact energies (E = 0.1 - 1.0). The polarization degrees of lines corresponding to and transitions were measured and were compared with theoretical polarization degrees obtained from distributions calculated by using the classical trajectory Monte Carlo (CTMC) method. A remarkable energy dependence is observed in both the experimental and theoretical results at very low projectile velocity. A qualitative discussion based on the relative importance of the different dynamical couplings is proposed.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"267 1","pages":"1517-1530"},"PeriodicalIF":0.0,"publicationDate":"1997-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91313735","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
Excess energy partitioning between electrons departing at and in the ionization of helium near threshold 在氦接近阈值的电离处和电离中离开的电子之间的过量能量分配
Journal of Physics B Pub Date : 1997-03-14 DOI: 10.1088/0953-4075/30/5/007
K. Asmis, M. Allan
{"title":"Excess energy partitioning between electrons departing at and in the ionization of helium near threshold","authors":"K. Asmis, M. Allan","doi":"10.1088/0953-4075/30/5/007","DOIUrl":"https://doi.org/10.1088/0953-4075/30/5/007","url":null,"abstract":"Partitioning of excess energy between electrons departing at and after electron-impact ionization of helium has been measured. A recently developed scheme, using a magnetically collimated electron-impact spectrometer, pulsed incident electron beam and time-of-flight detection was used to detect the electrons departing in the forward and backward directions. The ratios of the forward and backward doubly differential cross sections (DDCS) for an incident electron energy 3 eV above threshold and secondary electron energies of 0.7, 1.5 and 2.9 eV were measured. The relative DDCS at and are also presented as a function of the secondary electron energy, for incident electron energies 3 and 5 eV above threshold. Our measurements show that the distribution of the secondary electrons is, in contrast to electrons detected at , not flat for electrons departing at and at the present low primary energies. The yield of the faster secondary electrons is forward peaked, the yield of the slower secondary electrons is backward peaked. The sum of the and DDCS is, however, flat within the experimental uncertainty limits.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1997-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86949823","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: 9
Sixth spectrum of lanthanum (La VI): analysis of the , and configurations 镧(La VI)的第六光谱:结构分析
Journal of Physics B Pub Date : 1997-02-28 DOI: 10.1088/0953-4075/30/4/009
R. Gayasov, Y. N. Joshi, A. Tauheed
{"title":"Sixth spectrum of lanthanum (La VI): analysis of the , and configurations","authors":"R. Gayasov, Y. N. Joshi, A. Tauheed","doi":"10.1088/0953-4075/30/4/009","DOIUrl":"https://doi.org/10.1088/0953-4075/30/4/009","url":null,"abstract":"The spectrum of lanthanum was photographed in the 300 - 1220 A wavelength region on a 3 m normal incidence and a 10.7 m grazing incidence spectrograph using a triggered spark source. The - transitions of La VI were analysed. We have confirmed the earlier analysis of Reader of the - transitions. Of 52 possible levels of the three odd configurations 42 have been established. Six of the 10 unknown levels have and give no transitions to the ground-state configuration. One hundred and three lines have been classified in the La VI spectrum. The least-squares-fitted and relativistic Hartree - Fock calculations were carried out to interpret the observed spectrum.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"46 1","pages":"873-879"},"PeriodicalIF":0.0,"publicationDate":"1997-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89393573","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
Self-broadening of - (n= 5,6) neon lines - (n= 5,6)氖线的自展宽
Journal of Physics B Pub Date : 1997-02-14 DOI: 10.1088/0953-4075/30/3/010
P. Leo, D. F. T. Mullamphy, G. Peach, V. Venturi, I. Whittingham
{"title":"Self-broadening of - (n= 5,6) neon lines","authors":"P. Leo, D. F. T. Mullamphy, G. Peach, V. Venturi, I. Whittingham","doi":"10.1088/0953-4075/30/3/010","DOIUrl":"https://doi.org/10.1088/0953-4075/30/3/010","url":null,"abstract":"Quantum close-coupled calculations of the collisional self-broadening of neon lines involving transitions whose upper level is either , , or and lower level is , , or are presented for temperatures between 70 and 400 K. These calculations are based on the quantum-mechanical impact theory of Baranger in which the interatomic interaction is represented by adiabatic molecular potentials calculated using model potentials for the electron - atom and atomic core - core interactions. We discuss the complications arising from the contributions of the highly excited states and give parametric fits to the width and shifts of all lines in the temperature range 70 - 400 K.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"13 1","pages":"535-545"},"PeriodicalIF":0.0,"publicationDate":"1997-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77386208","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
Study of the emission in K under two-photon excitation 双光子激发下K的发射研究
Journal of Physics B Pub Date : 1996-11-28 DOI: 10.1088/0953-4075/29/22/032
T. Efthimiopoulos, M. Movsessian, M. Katharakis, N. Merlemis, K. Chrissopoulou
{"title":"Study of the emission in K under two-photon excitation","authors":"T. Efthimiopoulos, M. Movsessian, M. Katharakis, N. Merlemis, K. Chrissopoulou","doi":"10.1088/0953-4075/29/22/032","DOIUrl":"https://doi.org/10.1088/0953-4075/29/22/032","url":null,"abstract":"It is shown that by proper use of the excitation spectra, the emission spectra of the transition and the far-field patterns it is possible to distinguish between competing processes involved in the two-photon excitation to the 6S state of potassium, namely: (a) resonant fluorescence emission associated with the cascading spontaneous emission (ASE) and (b) the four-wave mixing parametric process. The effect of the buffer gas on the intensities of the spectra of the radiations emitted is discussed. Conical emission and spatial instabilities of the excitation radiation and the emission were also observed for high excitation and high vapour pressure of potassium.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"34 1","pages":"5619-5627"},"PeriodicalIF":0.0,"publicationDate":"1996-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74141737","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: 9
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