Material-dependent Variations of Alignment in Beam-Foil Excitation
- 1 September 1977
- journal article
- Published by IOP Publishing in Physica Scripta
- Vol. 16 (3-4) , 99-104
- https://doi.org/10.1088/0031-8949/16/3-4/005
Abstract
We have measured the linear polarization fractions of the 2s 1 S-3p 1 P He I transition at 5 016 Å excited by the passage of helium ions through thin perpendicular foils at beam energies of 40 to 220 keV. Metallic foils such as Au and Ag show less polarization than carbon, while non-conducting SiO2 foils produce increased linear polarization. Time variations of the polarization show that the build-up of impurities on the final surface of the foils yields carbon-foil like polarizations. At higher beam energies of 0.6 to 1.0 MeV, all foils show increased polarization for neon transitions, but decreased polarization for He II transitions with respect to the carbon foil values.Keywords
This publication has 12 references indexed in Scilit:
- Alignment of helium excited by thin carbon foilsPhysical Review A, 1977
- Beam-foil spectroscopyReports on Progress in Physics, 1977
- Thickness Variations and Lifetimes of Carbon Foils under Nitrogen-ion BombardmentPhysica Scripta, 1976
- Surface material dependence of beam-tilted-foil orientation and alignmentPhysics Letters A, 1975
- Fine Structure, Hyperfine Structure and Lamb Shift Measurements by the Beam-foil TechniquePhysica Scripta, 1974
- Anisotropy in the Beam-Foil Light SourcePhysical Review Letters, 1974
- Impact Excitation and Polarization of the Emitted LightReviews of Modern Physics, 1973
- Fine and hyperfine measurements in light atomsNuclear Instruments and Methods, 1973
- Beam-foil g-factor measurementsNuclear Instruments and Methods, 1973
- The polarization of atomic line radiation excited by electron impactPhilosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1958