Report
أعرض في EDS

High-resolution Laboratory Measurements of K-shell X-ray Line Polarization and Excitation Cross Sections in Helium-like S XV Ions

التفاصيل البيبلوغرافية
العنوان: High-resolution Laboratory Measurements of K-shell X-ray Line Polarization and Excitation Cross Sections in Helium-like S XV Ions
المؤلفون: Chintan Shah, Natalie Hell, Antonia Hubbard, Ming Feng Gu, Michael J. MacDonald, Megan E. Eckart, Richard L. Kelley, Caroline A. Kilbourne, Maurice A. Leutenegger, F. Scott Porter, Gregory V. Brown
المصدر: The Astrophysical Journal. 914(1)
بيانات النشر: United States: NASA Center for Aerospace Information (CASI), 2021.
سنة النشر: 2021
مصطلحات موضوعية: Astrophysics
الوصف: We report measurements of electron-impact excitation cross sections for the strong K-shell n = 2 -> 1 transitions in S XV, using the LLNL EBIT-I electron beam ion trap, two crystal spectrometers, and the EBIT Calorimeter Spectrometer. The cross sections are determined by direct normalization to the well-known cross sections of radiative electron capture, measured simultaneously. Using contemporaneous polarization measurements with the two crystal spectrometers, whose dispersion planes are oriented parallel and perpendicular to the electron beam direction, the polarization of the direct excitation line emission is determined, and in turn the isotropic total cross sections are extracted. We further experimentally investigate various line-formation mechanisms, finding that radiative cascades and collisional inner-shell ionization dominate the degree of linear polarization and total line emission cross sections of the forbidden line, z.
نوع الوثيقة: Report
اللغة: English
تدمد: 1538-4357
0004-637X
DOI: 10.3847/1538-4357/abf1ea
URL الوصول: https://ntrs.nasa.gov/citations/20210017072
ملاحظات: NNH15CO48B

80GSFC18T0059

888692

80GSFC20T0061
رقم الانضمام: edsnas.20210017072
قاعدة البيانات: NASA Technical Reports
الوصف
تدمد:15384357
0004637X
DOI:10.3847/1538-4357/abf1ea