Excitation and Ionization of Highly Charged Ions by Electron Impact. Progress Report, January 1, 1978-July 31, 1979. [Cross Sections, Coupling Strengths, Summaries of Research Activities at Penn. State Univ].

Excitation and Ionization of Highly Charged Ions by Electron Impact. Progress Report, January 1, 1978-July 31, 1979. [Cross Sections, Coupling Strengths, Summaries of Research Activities at Penn. State Univ].

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Published: 1979

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Reduced ionization cross sections Q/sub R//sup H/(nl, u) were obtained for the nl = 3p and 3d sublevels, as well as for more energy points for the lower sublevels considered in our earlier work. Thus, results are now available for the eight impact electron energies in threshold units u = 1.125, 1.25, 1.5, 2.25, 3.0, 4.0, 5.0, and 6.0 for each of the sublevels 1s, 2s, 2p, 3s, 3p, and 3d. From these results for Q/sub R//sup H/(nl, u) one can readily obtain the cross section for ionization from any of these sublevels in any highly charged complex ion using the simple procedures given in our earlier work. The theory and computer programs developed in our previous work on excitation were used to calculate intermediate coupling collision strengths for all fine structure transitions from the 2P levels to the nP and nD levels with 3 less than or equal to n less than or equal to 5 in He-like ions. Similar calculations have also been made for inner shell excitation of Li-like ions with nuclear charge number Z in the range 10 less than or equal to Z less than or equal to 74. The theory and programs were also extended to treat .delta.n = 0 transitions and were used to obtain intermediate coupling collision strengths for all .delta.n = 0 fine structure transitions with n = 2 in 10 He-like ions with Z in the range 6 less than or equal to Z less than or equal to 74 and 10 Be-like ions with Z in the range 14 less than or equal to Z less than or equal to 74. For excitation the results appear to be accurate to within approx. 30% for 3N less than or equal to Z less than or equal to 74, where N is the number of bound electrons per ion, and more accurate for most of this range. For ionization the results appear to be accurate down to Z/N approx. = 2. 21 references.


Electron Impact Collision Strengths for Excitation of Highly Charged Ions

Electron Impact Collision Strengths for Excitation of Highly Charged Ions

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Published: 1990

Total Pages: 8

ISBN-13:

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The principle task given us by the Lawrence Livermore National Laboratory (LLNL) to perform under Subcontract 6181405 was to develop a method and corresponding computer programs to make very rapid, yet accurate, fully relativistic and quasirelativistic calculations of cross sections or collision strengths for electron impact excitation of highly charged ions with any value for the nuclear charge number Z. Also while this major code development was being done we were asked to calculate cross sections of interest using our previous rapid, more approximate codes, which used hydrogenic basis functions and screening constants with both the electron-electron Coulomb interaction and relativistic interactions included by perturbation theory. We were also asked to determine the branching ratio for ionization to various final states in complex cases, where two or more states corresponding to the final configuration of the ion were possible.


Methods for Geochemical Analysis

Methods for Geochemical Analysis

Author: Philip A. Baedecker

Publisher:

Published: 1987

Total Pages: 192

ISBN-13:

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Analytical methods used in the Geologic Division laboratories of the U.S. Geological Survey for the inorganic chemical analysis of rock and mineral samples.


Discharge in Long Air Gaps

Discharge in Long Air Gaps

Author: Abderrahmane Beroual

Publisher: IOP Publishing Limited

Published: 2016

Total Pages: 0

ISBN-13: 9780750312370

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'Discharge in Long Air Gaps' presents self-consistent predictive dynamic models of positive and negative discharges in long air gaps. Equivalent models are also derived to predict lightning parameters based on the similarities between long air gap discharges and lightning flashes. Comparisons between computed and experimental results for various test configurations are presented and discussed.


Uranium Enrichment and Nuclear Weapon Proliferation

Uranium Enrichment and Nuclear Weapon Proliferation

Author: Allan S. Krass

Publisher: Routledge

Published: 2020-11-20

Total Pages: 325

ISBN-13: 100020054X

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Originally published in 1983, this book presents both the technical and political information necessary to evaluate the emerging threat to world security posed by recent advances in uranium enrichment technology. Uranium enrichment has played a relatively quiet but important role in the history of efforts by a number of nations to acquire nuclear weapons and by a number of others to prevent the proliferation of nuclear weapons. For many years the uranium enrichment industry was dominated by a single method, gaseous diffusion, which was technically complex, extremely capital-intensive, and highly inefficient in its use of energy. As long as this remained true, only the richest and most technically advanced nations could afford to pursue the enrichment route to weapon acquisition. But during the 1970s this situation changed dramatically. Several new and far more accessible enrichment techniques were developed, stimulated largely by the anticipation of a rapidly growing demand for enrichment services by the world-wide nuclear power industry. This proliferation of new techniques, coupled with the subsequent contraction of the commercial market for enriched uranium, has created a situation in which uranium enrichment technology might well become the most important contributor to further nuclear weapon proliferation. Some of the issues addressed in this book are: A technical analysis of the most important enrichment techniques in a form that is relevant to analysis of proliferation risks; A detailed projection of the world demand for uranium enrichment services; A summary and critique of present institutional non-proliferation arrangements in the world enrichment industry, and An identification of the states most likely to pursue the enrichment route to acquisition of nuclear weapons.


Phosphor Handbook

Phosphor Handbook

Author: Shigeo Shionoya

Publisher: CRC Press

Published: 2018-10-03

Total Pages: 1078

ISBN-13: 1420005235

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A benchmark publication, the first edition of the Phosphor Handbook set the standard for references in this field. Completely revised and updated, this second edition explores new and emerging fields such as nanophosphors, nanomaterials, UV phosphors, quantum cutters, plasma display phosphors, sol-gel and other wet phosphor preparation techniques, preparation through combustion, bioluminescence phosphors and devices, and new laser materials such as OLED. It also contains new chapters on the applications of phosphors in solid state lighting, photoionization of luminescent centers in insulating phosphors, and recent developments in halide-based scintillators. The handbook provides a comprehensive description of phosphors with an emphasis on practical phosphors and their uses in various kinds of technological applications. It covers the fundamentals, namely the basic principles of luminescence, the principle phosphor materials, and their optical properties. The authors describe phosphors used in lamps, cathode-ray tubes, x-ray, and ionizing radiation detection. They cover common measurement methodology used to characterize phosphor properties, discuss a number of related items, and conclude with the history of phosphor technology and industry.