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Autler-Townes doublet probed by strong field 强场探测的奥特勒-汤斯重态
Journal of Physics B Pub Date : 1998-10-21 DOI: 10.1088/0953-4075/32/3/009
M. Stepanov
{"title":"Autler-Townes doublet probed by strong field","authors":"M. Stepanov","doi":"10.1088/0953-4075/32/3/009","DOIUrl":"https://doi.org/10.1088/0953-4075/32/3/009","url":null,"abstract":"This paper deals with the Autler-Townes doublet structure. Applied driving and probing laser fields can have arbitrary intensities. An explanation is given of the broadening of doublet components with the growth of probing field intensity, which was observed in experiment. The effects of Doppler averaging are discussed.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"2 1","pages":"649-661"},"PeriodicalIF":0.0,"publicationDate":"1998-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80760863","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
LETTER TO THE EDITOR: Quantum degeneracy and interaction effects in spin-polarized Fermi - Bose mixtures 致编辑:自旋极化费米-玻色混合物中的量子简并和相互作用效应
Journal of Physics B Pub Date : 1998-10-09 DOI: 10.1088/0953-4075/31/21/002
L. Vichi, M. Inguscio, S. Stringari, G. Tino
{"title":"LETTER TO THE EDITOR: Quantum degeneracy and interaction effects in spin-polarized Fermi - Bose mixtures","authors":"L. Vichi, M. Inguscio, S. Stringari, G. Tino","doi":"10.1088/0953-4075/31/21/002","DOIUrl":"https://doi.org/10.1088/0953-4075/31/21/002","url":null,"abstract":"Various features of spin-polarized Fermi gases confined in harmonic traps are discussed, taking into account possible perspectives of experimental measurements. The mechanism of the expansion of the gas is explicitly investigated and compared with that of an interacting Bose gas. The role of interactions in the equilibrium and non-equilibrium behaviour of the fermionic component in Fermi - Bose mixtures is discussed. Special emphasis is given to the case of potassium isotope mixtures.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76660758","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
Final state alignment for electron transfer 电子转移的最终态对准
Journal of Physics B Pub Date : 1998-08-14 DOI: 10.1088/0953-4075/31/15/013
Sonia Grego, J. Salgado, J. Thomsen, M. Machholm, S. Nielsen, N. Andersen
{"title":"Final state alignment for electron transfer","authors":"Sonia Grego, J. Salgado, J. Thomsen, M. Machholm, S. Nielsen, N. Andersen","doi":"10.1088/0953-4075/31/15/013","DOIUrl":"https://doi.org/10.1088/0953-4075/31/15/013","url":null,"abstract":"The final state integral alignment for the electron transfer process is investigated in the keV energy range. Experimentally, polarization analysed photons from the Li I - transition are detected in coincidence with scattered Li neutrals in the 1-25 keV impact energy range. Over most of this range, we find good agreement with 26- and 35-state atomic orbital (AO) basis coupled-channel calculations, as well as with 28-state molecular orbital (MO) basis predictions. Limits of validity of the two theoretical approaches are also discussed in terms of the predicted state-to-state transfer cross sections.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"15 7","pages":"3419-3428"},"PeriodicalIF":0.0,"publicationDate":"1998-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91469966","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
Electron spectra from singlet and triplet states of produced by low-energy , Ne and Ar collisions 低能、Ne和Ar碰撞产生的单重态和三重态电子能谱
Journal of Physics B Pub Date : 1998-07-28 DOI: 10.1088/0953-4075/31/14/019
S. Kitazawa, K. Tanabe, S. Machida, Y. Matsui, H. Ida, T. Takayanagi, K. Wakiya, K. Iemura, F. Currell, S. Ohtani, H. Suzuki, M. Sekiguchi, U. Safronova
{"title":"Electron spectra from singlet and triplet states of produced by low-energy , Ne and Ar collisions","authors":"S. Kitazawa, K. Tanabe, S. Machida, Y. Matsui, H. Ida, T. Takayanagi, K. Wakiya, K. Iemura, F. Currell, S. Ohtani, H. Suzuki, M. Sekiguchi, U. Safronova","doi":"10.1088/0953-4075/31/14/019","DOIUrl":"https://doi.org/10.1088/0953-4075/31/14/019","url":null,"abstract":"Ejected electrons from the singlet and triplet states of doubly excited and ions, produced by 25, 50, 75 and 100 keV and Ar collisions have been measured with high-resolution electron spectroscopy. Only singlet states were observed when the target was He; in contrast, many triplet states were observed in and Ar collisions. Both singlet and triplet states contributed to the electron spectra in collisions, in particular, triplet states were conspicuous at low energy. Two theoretical methods, perturbation theory or Z expansion (MZ code) and multiconfigurational Hartree-Fock (Cowan code) were used for identification of ejected-electron spectra. The collision energy dependence of the spectra is discussed.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"8 1","pages":"3233-3243"},"PeriodicalIF":0.0,"publicationDate":"1998-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89815188","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
Infrared high-resolution spectra of ozone in the range 5500-: analysis of and bands 臭氧5500-范围内的红外高分辨率光谱:各波段的分析
Journal of Physics B Pub Date : 1998-06-14 DOI: 10.1088/0953-4075/31/11/017
A. Barbe, A. Chichery, V. Tyuterev, S A Taskhun, S. Mikhailenko
{"title":"Infrared high-resolution spectra of ozone in the range 5500-: analysis of and bands","authors":"A. Barbe, A. Chichery, V. Tyuterev, S A Taskhun, S. Mikhailenko","doi":"10.1088/0953-4075/31/11/017","DOIUrl":"https://doi.org/10.1088/0953-4075/31/11/017","url":null,"abstract":"The and bands of ozone, which occur in the region, have been observed for the first time using a Fourier transform spectrometer, operating at resolution and with a large pathlength pressure product . The assignment of rotation-vibration transitions has been done for J up to 35 and Ka up to 12, for the band and up to J = 40 and Ka = 2 for the band respectively. The effective Hamiltonian used in calculations accounts for the first-order Coriolis coupling between these two bands. In addition, as the levels corresponding to Ka = 5 are perturbed, it was necessary to account for anharmonic resonance with the (321) state. Also, to correctly reproduce the levels of (015) with Ka = 8,9,10 it has been necessary to include a Coriolis coupling with (080) state in the model. In this way, we have obtained a very satisfactory r.m.s. deviation of , near the experimental accuracy. Rovibrational line intensities of and bands were measured and the value of the principal transition moment constants have been recovered. Finally a complete list of line positions and intensities was calculated leading to the integrated band intensity of /molecule for the band and /molecule for the band at 296 K with a cut-off of .","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"545 1","pages":"2559-2569"},"PeriodicalIF":0.0,"publicationDate":"1998-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74787824","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: 21
Electron impact excitation of the , , and states of CO at 10.0, 12.5 and 15.0 eV impact energies CO在10.0、12.5和15.0 eV冲击能下的电子冲击激发
Journal of Physics B Pub Date : 1998-05-28 DOI: 10.1088/0953-4075/31/10/025
P. Zetner, I. Kanik, S. Trajmar
{"title":"Electron impact excitation of the , , and states of CO at 10.0, 12.5 and 15.0 eV impact energies","authors":"P. Zetner, I. Kanik, S. Trajmar","doi":"10.1088/0953-4075/31/10/025","DOIUrl":"https://doi.org/10.1088/0953-4075/31/10/025","url":null,"abstract":"We have measured the differential and integral cross sections for electron impact excitation of the , , and states of CO in the 10-15 eV impact energy region. These measurements fill the gap which existed between the low-energy (threshold to about 12 eV) data of Zobel et al and the intermediate energy (20-50 eV) results of Middleton et al. Recent electron time-of-flight measurements are utilized to place the relative cross sections (deduced from energy-loss spectra) on the absolute scale. The cross sections are in excellent agreement with the results obtained by Zobel et al at the overlapping impact energies and always smoothly extrapolate to their low-energy results. Extrapolation to the intermediate energy domain and comparison with the results of Middleton et al is not so clear. Comparison with theoretical differential and integral cross sections of Sun et al and the integral cross sections of Morgan and Tennyson reveals angular and energy dependences which resemble those found for the experimental results but there are serious discrepances concerning the absolute magnitudes.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"23 1","pages":"2395-2413"},"PeriodicalIF":0.0,"publicationDate":"1998-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75739853","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: 23
The 2p interloper resonances in collisions 碰撞中的2p干涉子共振
Journal of Physics B Pub Date : 1998-04-14 DOI: 10.1088/0953-4075/31/7/004
C. Ballance, B. McLaughlin, O. Nagy, K. Berrington, P. Burke
{"title":"The 2p interloper resonances in collisions","authors":"C. Ballance, B. McLaughlin, O. Nagy, K. Berrington, P. Burke","doi":"10.1088/0953-4075/31/7/004","DOIUrl":"https://doi.org/10.1088/0953-4075/31/7/004","url":null,"abstract":"Ab initio electron scattering calculations using the R-matrix approach have been performed for within a three-state valence configuration-interaction model (VCI). The lowest three electronic target states (, and the ) of this molecular nitrogen cation are included in the close-coupling method, with each state being represented by a valence CI approximation. From a detailed analysis of the resonance structure found in our work for the symmetries we find four prominent Rydberg series of the type , , , and a interloper resonance. This interloper molecular resonance associated with the B state of is seen to cause distortions of the resulting resonance spectra. A comparison of our total cross sections for the X - B transition shows excellent agreement with the available experimental data.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"62 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90438510","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
ion-induced L x-ray emission cross sections of ytterbium 离子诱导的镱的L - x射线发射截面
Journal of Physics B Pub Date : 1997-12-28 DOI: 10.1088/0953-4075/30/24/009
A. Hallak
{"title":"ion-induced L x-ray emission cross sections of ytterbium","authors":"A. Hallak","doi":"10.1088/0953-4075/30/24/009","DOIUrl":"https://doi.org/10.1088/0953-4075/30/24/009","url":null,"abstract":"Measured L x-ray ionization cross sections for bombardment of Yb in the energy range 1.0 - 8.5 MeV are compared with the ECPSSR theory. Significant discrepancies between theory and experiment are observed at an incident beam energy below about 5 MeV. The discrepancies are greatly reduced by the inclusion of collision-induced intrashell coupling (ECPSSR-IS) and modifications of the binding factor in the theory in the united atom picture (ECPSSR-IS-UA). More specifically, in this case of Yb L-shell ionization by energetic ions, the contribution of L-subshell coupling towards better agreement with the theory is more significant than binding energy correction.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"354 1","pages":"5693-5700"},"PeriodicalIF":0.0,"publicationDate":"1997-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76600478","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
Resonant and non-resonant charge transfer in and collisions 共振和非共振电荷在碰撞中的转移
Journal of Physics B Pub Date : 1997-11-28 DOI: 10.1088/0953-4075/30/22/024
F. Rohmund, E. Campbell
{"title":"Resonant and non-resonant charge transfer in and collisions","authors":"F. Rohmund, E. Campbell","doi":"10.1088/0953-4075/30/22/024","DOIUrl":"https://doi.org/10.1088/0953-4075/30/22/024","url":null,"abstract":"Charge transfer cross sections were measured for the single-electron charge transfer reactions as a function of the collision energy E in the range 200 - 2100 eV. For both processes the absolute values of the cross sections are similar to the geometrical cross sections and decrease with increasing collision energy below E = 400 eV. In the case of projectiles, the charge transfer cross section remains almost constant for larger collision energies while increases in the case of capture by beyond 400 eV and saturates around 1350 eV. From an interpretation of the measured cross sections using very simple models it can be concluded that the electron transfer is resonant in collisions between and , as would be expected, and has both resonant and non-resonant contributions for projectiles. The qualitative agreement of the experimental results with very simple one-electron models developed to describe the general trends of the charge transfer cross sections determined in ion - atom collisions in the intermediate energy range (where the semiclassical impact parameter method can be applied) is quite surprising.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"61 1","pages":"5293-5303"},"PeriodicalIF":0.0,"publicationDate":"1997-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78701950","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
New spectroscopic studies of the -band system of the molecule 分子-波段系统的新光谱研究
Journal of Physics B Pub Date : 1997-11-14 DOI: 10.1088/0953-4075/30/21/023
J. Danielak, R. Kȩpa, M. Zachwieja
{"title":"New spectroscopic studies of the -band system of the molecule","authors":"J. Danielak, R. Kȩpa, M. Zachwieja","doi":"10.1088/0953-4075/30/21/023","DOIUrl":"https://doi.org/10.1088/0953-4075/30/21/023","url":null,"abstract":"In the emission spectrum of the nitric oxide isotopomer eight bands: 0 - 3, 0 - 4, 1 - 4, 1 - 5, 1 - 6, 2 - 6, 2 - 7 and 3 - 4 comprising about 1160 lines belonging to the -band system have been remeasured and reanalysed. The rotational analysis of these bands and the calculation of the rovibronic structure constants have been performed via a nonlinear least-squares fits with the effective Hamiltonians of Brown et al. The merged analysis of the currently analysed bands and earlier observed vibrational - rotational 1 - 0, 2 - 1 and 3 - 0 bands made it possible to considerably enlarge, unify and specify with greater precision the information about the and states in . In particular, new constants of the rovibronic structure have been calculated for the and levels and equilibrium molecular constants as well as the Franck - Condon factors and r centroids for the bands in the molecule.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"19 1","pages":"4889-4898"},"PeriodicalIF":0.0,"publicationDate":"1997-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80536351","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
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