Calculated electron impact cross sections for the K-shell ionization of Fe, Co, Mn, Ti, Zn, Nb, and Mo atoms using the DM formalism

Deutsch, Hans‐Peter; Becker, K.; Gstir, B.; Märk, T.D.

doi:10.1016/s1387-3806(01)00515-2

Cited by 45 publications

(31 citation statements)

References 14 publications

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“…The characteristic or line radiation exhibits a quasi-threshold dependence on the intensity, as it increases more rapidly after a delayed onset. The collisional ionization cross section for the 2s electron (whose vacancy results in L-shell photon emission) peaks at energies well above those measured in the experiments here, approximately three times its binding energy [27], which is shown by the dotted line in Fig. 3.…”

Section: Target Materialssupporting

confidence: 48%

Application of Advanced Laser Diagnostics to High-Impact Technologies: Science and Applications of Ultrafast, Ultraintense Lasers

Goss¹

2013

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information , 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YY)2. REPORT TYPE 3. DATES COVERED (From -To) AFRL/RQTC SPONSORING/MONITORING AGENCY REPORT NUMBER(S) AFRL-RQ-WP-TR-2013-0189 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution unlimited. SUPPLEMENTARY NOTESReport contains color. PA Case Number: 88ABW-2013-5333; Clearance Date: 17 Dec 2013. On many of the papers, the U.S. Government is joint author and has the right to use, modify, reproduce, release, perform, display, or disclose the work. ABSTRACTThis report describes the results of experimental and numerical investigations on the development of extreme-light diagnostics. The purpose of this program was to develop extreme-light diagnostic tools that could be utilized in the future for exploring new frontiers of aerospace science and performing in-place nondestructive evaluation and inspections of newly manufactured and fielded weaponssystems components. The objectives of this research program were realized through an extensive experimental campaign that utilized ultrafast and ultraintense laser systems for the development of advanced sources of secondary emission for nondestructive evaluation. The secondary sources were to include X-rays, energetic electrons, neutrons, and protons. At the crux of the work was the fundamental interaction between an incident, ultrafast, ultraintense laser pulse and a material target. A variety of target materials was explored in this work, and much of the effort was spent on fundamental studies. The results of these studies will serve to guide engineering efforts in establishing these sources for future Air Force applications. Most of the effort was directed toward the development of hard X-ray sources using both metal and liquid targets.The following titles, which have been published in professional journals and conference proceedings or are unpublished reports/presentations, are provided in this report:  "Efficiency and scaling of an ultrashort-pulse high-repetition-rate laser-driven X-ray source"  "An Evaluation of fs/ns-LIBS for Measuring Total Particulate Emissions"  "Picosecond Laser Machining of Shaped Holes In Thermal Barrier Coated Turbine Blades"  "Doub...

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Section: Target Materialssupporting

confidence: 48%

Application of Advanced Laser Diagnostics to High-Impact Technologies: Science and Applications of Ultrafast, Ultraintense Lasers

Goss¹

2013

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“…For high incident energies from several keV, relativistic effects affect the EI ionization cross sections considerably. In the DM model 18, relativistic effects are included via a multiplying factor to the nonrelativistic DM model 4, and this provides a good description of the electron impact K‐shell ionization of atoms with a wide range of Z values 19–21. In the BEA model, the relativistic kinematics is absent.…”

Section: Introductionmentioning

confidence: 99%

Electron‐impact single ionization cross sections of helium isoelectronic systems

Uddin

Basak

Saha

2004

Int J of Quantum Chemistry

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ABSTRACT:-are calculated using a recently propounded parameter-free relativistic binary encounter (RBEA) model, which remains valid up to the relativistic energy domain. Our RBEA results are compared with those of the Coulomb-Born (CB) approximation, distorted wave Born approximation (DWBA), relativistic two-potential DWBA (RTPD), the simple empirical model of Brenshtam et al. (BRY), and the model of Deutsch and Märk (DM) along with the available experimental data. The RBEA model, while keeping the comparable predictive power of cross sections, is found to overcome the limitations of the empirical BRY and DM models with their fitting parameters, and the quantum mechanical CB, DWBA, and RTPD theories with arduous and lengthy calculations.

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“…where r 1s is the radius of maximum radial density of Cu 1s-shell from the tables of Desclaux [57], g 1s is a weighting factor, E 1s is the binding energy of 1s electrons, and the functions f , F are those in reference [56].…”

Section: Numerical Modelmentioning

confidence: 99%

Fast Ignition Experimental and Theoretical Studies

Akli

2006

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We are becoming dependent on energy more today than we were a century ago, and with increasing world population and booming economies, sooner or later our energy sources will be exhausted. Moreover, our economy and welfare strongly depends on foreign oil and in the shadow of political uncertainties, there is an urgent need for a reliable, safe, and cheap energy source. Thermonuclear fusion, if achieved, is that source of energy which not only will satisfy our demand for today but also for centuries to come. Today, there are two major approaches to achieve fusion: magnetic confinement fusion (MFE) and inertial confinement fusion (ICF). This dissertation explores the inertial confinement fusion using the fast ignition concept. Unlike the conventional approach where the same laser is used for compression and ignition, in fast ignition separate laser beams are used. This dissertation addresses three very im-2 portant topics to fast ignition inertial confinement fusion. These are laser-to-electron coupling efficiency, laser-generated electron beam transport, and the associated isochoric heating.First, an integrated fast ignition experiment is carried out with 0.9 kJ of energy in the compression beam and 70 J in the ignition beam. Measurements of absolute K α yield from the imploded core revealed that about 17% of the laser energy is coupled to the suprathermal electrons. Modeling of the transport of these electrons and the associated isochoric heating, with the previously determined laser-to-electron conversion efficiency, showed a maximum target temperature of 166 eV at the front where the electron flux is higher and the density is lower. The contribution of the potential, induced by charge separation, in opposing the motion of the electrons was moderate. Second, temperature sensitivity of Cu K α imaging efficiency using a spherical Bragg reflecting crystal is investigated. It was found that due to the shifting and broadening of the K α line, with increasing temperature, both the brightness and the pattern of K α intensity are affected. Finally, x-ray spectroscopy of a 500 J 0.7 ps laser-solid interactions showed the formation of a hot surface layer(∼1 µm) at the front of the target. PIC simulations confirm surface heating.Prof. Richard R. Freeman Dissertation Committee Chair i ii

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Calculated electron impact cross sections for the K-shell ionization of Fe, Co, Mn, Ti, Zn, Nb, and Mo atoms using the DM formalism

Cited by 45 publications

References 14 publications

Application of Advanced Laser Diagnostics to High-Impact Technologies: Science and Applications of Ultrafast, Ultraintense Lasers

Application of Advanced Laser Diagnostics to High-Impact Technologies: Science and Applications of Ultrafast, Ultraintense Lasers

Electron‐impact single ionization cross sections of helium isoelectronic systems

Fast Ignition Experimental and Theoretical Studies

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