The polarization of Lyman-0. radiation resulting from the direct excitation of hydrogen atoms by proton impact has been measured in the energy range 2-21 keV. A Brewster's angle polarization analyzer was used to measure the polarization of the observed Lyman-~radiation. The results are compared with the four-state Sturmian calculation of Gallaher and Valets.Foundation.
The ratio of electron-impact cross sections of atomic and molecular hydrogen for production of uv radiation detected by an oxygen-filtered iodine-vapor-filled photon counter has been precisely measured in a modulated beam experiment. Using a filter 1.67 cm long with an oxygen pressure of 1 atm, the ratio of cross sections at 100 eV was found to be 4.05 ± 0.07. Using the known cross section for production of Lyman-alpha radiation from the hydrogen atom, the cross section for molecular radiation received by the detector was determined to be 1.48 (± 0.05) × 10−17 cm2.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.