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The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform

Tuan Minh Tran - One of the best experts on this subject based on the ideXlab platform.

J Ullrich - One of the best experts on this subject based on the ideXlab platform.

  • electron impact ionization of helium a comprehensive experiment benchmarks theory
    Physical Review A, 2011
    Co-Authors: Igor Bray, Dmitry V Fursa, J Colgan, M S Pindzola, Thomas Pfluger, Arne Senftleben, Shenyue Xu, Alexander Dorn, J Ullrich
    Abstract:

    Single ionization of helium by 70.6-eV electron impact is studied in a comprehensive experiment covering a major part of the entire collision kinematics and the full 4{pi} solid angle for the emitted electron. The absolutely normalized triple-differential experimental cross sections are compared with results from the convergent close-coupling (CCC) and the time-dependent close-coupling (TDCC) theories. Whereas Excellent Agreement with the TDCC prediction is only found for equal energy sharing, the CCC calculations are in Excellent Agreement with essentially all experimentally observed dynamical features, including the absolute magnitude of the cross sections.

  • electron impact ionization of helium a comprehensive experiment benchmarks theory
    Physical Review A, 2011
    Co-Authors: Xueguang Ren, Igor Bray, Dmitry V Fursa, J Colgan, M S Pindzola, Thomas Pfluger, Arne Senftleben, Alexander Dorn, J Ullrich
    Abstract:

    Single ionization of helium by 70.6-eV electron impact is studied in a comprehensive experiment covering a major part of the entire collision kinematics and the full 4\ensuremath{\pi} solid angle for the emitted electron. The absolutely normalized triple-differential experimental cross sections are compared with results from the convergent close-coupling (CCC) and the time-dependent close-coupling (TDCC) theories. Whereas Excellent Agreement with the TDCC prediction is only found for equal energy sharing, the CCC calculations are in Excellent Agreement with essentially all experimentally observed dynamical features, including the absolute magnitude of the cross sections.

Solene Le Gal - One of the best experts on this subject based on the ideXlab platform.

M J Brunger - One of the best experts on this subject based on the ideXlab platform.

  • cross sections for electron impact excitation of the vibrationally resolved aπ1 electronic state of carbon monoxide
    Journal of Chemical Physics, 2007
    Co-Authors: H Kato, H Kawahara, M Hoshino, Hiroshi Tanaka, M J Brunger
    Abstract:

    The authors report new differential cross section measurements for electron impact excitation of the AΠ1(v′) states of carbon monoxide. The energy range is 20–200eV. They also reanalyze the AΠ1(v′) manifold cross sections of Middleton et al. [J. Phys. B 26, 1743 (1993)] in order to provide a basis for comparison with our new vibrationally resolved differential cross sections. Excellent Agreement is found between the two sets of measurements at all common energies. From 20to200eV the present differential cross sections are extrapolated and integrated, and the corresponding integral excitation cross sections determined. New scaled Born integral cross sections, calculated as a part of the present study, are compared against these experimental integral cross sections, with Excellent Agreement being found for all the AΠ1(v′=0–7)←XΣg+1(v″=0) transitions. In addition our scaled Born integral cross sections are found to be in Excellent Agreement between 300 and 1500eV with those derived from the previous experime...

Marie Fertin - One of the best experts on this subject based on the ideXlab platform.

  • dual energy ct dect lung perfusion in pulmonary hypertension concordance rate with v q scintigraphy in diagnosing chronic thromboembolic pulmonary hypertension cteph
    European Radiology, 2018
    Co-Authors: Matthieu Masy, Jessica Giordano, Gregory Petyt, Claude Hosseinfoucher, A Duhamel, Maeva Kyheng, Pascal De Groote, Marie Fertin
    Abstract:

    To evaluate the concordance between DECT perfusion and ventilation/perfusion (V/Q) scintigraphy in diagnosing chronic thromboembolic pulmonary hypertension (CTEPH). Eighty patients underwent V/Q scintigraphy and DECT perfusion on a 2nd- and 3rd-generation dual-source CT system. The imaging criteria for diagnosing CTEPH relied on at least one segmental triangular perfusion defect on DECT perfusion studies and V/Q mismatch on scintigraphy examinations. Based on multidisciplinary expert decisions that did not include DECT perfusion, 36 patients were diagnosed with CTEPH and 44 patients with other aetiologies of PH. On DECT perfusion studies, there were 35 true positives, 6 false positives and 1 false negative (sensitivity 0.97, specificity 0.86, PPV 0.85, NPV 0.97). On V/Q scans, there were 35 true positives and 1 false negative (sensitivity 0.97, specificity 1, PPV 1, NPV 0.98). There was Excellent Agreement between CT perfusion and scintigraphy in diagnosing CTEPH (kappa value 0.80). Combined information from DECT perfusion and CT angiographic images enabled correct reclassification of the 6 false positives and the unique false negative case of DECT perfusion. There is Excellent Agreement between DECT perfusion and V/Q scintigraphy in diagnosing CTEPH. The diagnostic accuracy of DECT perfusion is reinforced by the morpho-functional analysis of data sets. • Chronic thromboembolic pulmonary hypertension (CTEPH) is potentially curable by surgery. • The triage of patients with pulmonary hypertension currently relies on scintigraphy. • Dual-energy CT (DECT) can provide standard diagnostic information and lung perfusion from a single acquisition. • There is Excellent Agreement between DECT perfusion and scintigraphy in separating CTEPH and non-CTEPH patients.