The Si XIn=3−n=4 transition arrays from beam-foil spectra

Brandt, B. van den; Heckmann, P. H.; Fawcett, B C

doi:10.1007/bf01436934

Cited by 6 publications

(5 citation statements)

References 15 publications

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“…In a test run, the term structure of Si XI was calculated by our own technique. With very few exceptions, the analyses presented by Brandt et al [16] and by Kramida and Träbert [17] were corroborated. By cross-correlation, this also corroborates much of the analysis of the spectra of various Belike ions presented by Khardi et al [18].…”

Section: Introductionmentioning

confidence: 53%

“…At an ion beam energy of 18 MeV, the charge state distribution favoured Si X, with about equal ( but lower ) contributions by Si XI/Si IX, and Si XII/Si VIII, respectively. The strongest spectral features resulted from 3-4 transitions (notably 3d-4f transitions, which are unbranched) in Si XII (near 130 Å), Si XI (mostly 130 to 155 Å [16,17]), and Si X (mostly 155 to 190 Å). The "unexplored territory" of this latter range incited the present study.…”

Section: Introductionmentioning

confidence: 99%

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Relativistic Many-Body Perturbation Calculations of Boron-Like Silicon, Si X

Vilkas

Ishikawa

2005

Phys. Scr.

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XVIII. Onthe Strem~tk of Drictile ikluterials under Conabined Stress. B y JAMES J. GUEST *. (Communicated by the Secretaries.) C O N T~" OF ARTICLES. 1. Lack of knowledge of lams of strength. 2. Separation of the isotropic materials into ductile m d brittle, 3, The yield-point in Tension Tests. 4. The yield-point, rather than the ultimate, stl*ess the criterion of strength. 5. Variations of the ultimate and yield-point stresses : annealing. 6. The elastic limit. 7. The elastic-limit effect probably due to the existence of local yield-8. The yield-point, in preference to the clastic limit, selected as the 9. Torsion a case of combined stress. points. criterion of sbrength. 10. First reason for use of thin tubes as specimens. 11. Results of previous torsion experimentd. 12, Previous experiments upon the yield-point under combined stress. 13. Experiments upon ultimate strength under combined stress. 14. Theories of elastic strength under combined stress : the maximum 15, The maximum strain theory. 18, Theorem upon the limiting values of U . 17. The niaximum strain theory not disproved by published experiments.18. The niaximum shearing-stress criterion of elastic strength. 19. Further reasons for adopting thiu tubes as specimens. 20, Range of stress covered by diferent types of experiment. 21. Method of checking the isotropism of the material asregards yield-point 22. Objections to tubes 011 account of want of isotropy. 23, Objections to tubes on account of large effect of defects. 24. The system of Tests. 25, The specimeiis and holders. 28. The tension loads. 57. The application of torque. 28. The friction of the torsion-rigging. 29, The application of the interual pressure. 30. Measurement of the fluid pressure. 31. A new type of pressure-gauge. 32. Measurement of the distorsions. 33. A new Extensometer. stress theory. stresses. * Read May 25,1900. DUCTILE MATERIALS UNDER COMBINED STRESS. 203 34, Errors of extensometer. 35. A nem twist-measuring apparatus. 36. Proof that the torsion-mirrors measwe the twist. 37. Effect of beading. 38. As a transmission dynamometer. 39. The diametral extensometer. 40. Method of inaking the Tests. 41. The determinatioii of the sectional area and thickness of the tubes. 48. Calculation of the stresses. 43. Calculation of the strains. 44. Maxiilium shear and slide aye proportional. 46. Quantities tabulated. 46. Results of the experiruents-the tests on solid bars. 47. The material and shape of tubes satisfactory. 48. The elastic limit phenomenon. 49. Yield-point stresses of the same type nearly constant throughout series on each tube. 50. The variation of the maximimi stress. 51. The variation of the niaxiiiiuin principal strain. 52. The maximum shearing-stress or slide nearly constant. 53. Graphical presentation of variations. 54. Conclusions probable for general type of stress. 55. Effect of a volumetric stress (steel). 56. Convenient view of general type of stress. 57. The copper and brass tests, and diagrams. 68. Practical conclusions and note.

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Section: Introductionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Relativistic Many-Body Perturbation Calculations of Boron-Like Silicon, Si X

Vilkas

Ishikawa

2005

Phys. Scr.

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“…Bhatia & Landi (2007b) published a complete dataset for Si xi that is used here. They assembled experimental energy levels from a variety of sources: Edlén (1983), Acton et al (1985), Hoory et al (1970), the NIST database (Ralchenko et al 2007), Tondello (1969), Brandt et al (1988) and Khardi et al (1994). Multiple entries from different sources were averaged together.…”

Section: Mg IXmentioning

confidence: 99%

CHIANTI – an atomic database for emission lines

Dere¹,

Landi²,

Young³

et al. 2009

A&A

461

451

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Aims. The goal of the CHIANTI atomic database is to provide a set of atomic data for the interpretation of astrophysical spectra emitted by collisionally dominated, high temperature, optically thin sources. Methods. A complete set of ground level ionization and recombination rate coefficients has been assembled for all atoms and ions of the elements of H through Zn and inserted into the latest version of the CHIANTI database, CHIANTI 6. Ionization rate coefficients are taken from the recent work of Dere (2007, A&A, 466, 771) and recombination rates from a variety of sources in the literature. These new rate coefficients have allowed the calculation of a new set of ionization equilibria and radiative loss rate coefficients.For some ions, such as Fe viii and Fe ix, there are significant differences from previous calculations. In addition, existing atomic parameters have been revised and new atomic parameters inserted into the database. Results. For each ion in the CHIANTI database, elemental abundances, ionization potentials, atomic energy levels, radiative rates, electron and proton collisional rate coefficients, ionization and recombination rate coefficients, and collisional ionization equilibrium populations are provided. In addition, parameters for the calculation of the continuum due to bremsstrahlung, radiative recombination and two-photon decay are provided. A suite of programs written in the Interactive Data Language (IDL) are available to calculate line and continuum emissivities and other properties. All data and programs are freely available at http://wwwsolar.nrl.navy.mil/ chianti

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“…Literature sources for the observed energies: Edlen [17] (E), Acton et al [5] (A), Hoory et al [11] (H), NIST [18] (N), Tondello [19] (T), Brandt et al [20] Table 2 Si XI oscillator strengths radiative decay rates, and collision strengths…”

Section: Explanation Ofmentioning

confidence: 99%

“…Energy levels, oscillator strengths, and radiative transition rates are calculated in intermediate coupling. The energies calculated with both models are listed in Table 1 along with experimentally determined energies for a number of levels taken from Edlen [17], Acton et al [5], Hoory et al [11], Version 3 of the NIST database (Ralchenko et al [18]), Tondello [19], Brandt et al [20] and Khardi et al [10]. A few more values were obtained by averaging the measurements of the NIST database, Hoory et al [11], Tondello [19] and Fawcett et al [9].…”

Section: Atomic Datamentioning

confidence: 99%