Measurement of the degree of polarization for the radiative decay of He~+ (np) (n chemical bounds and 3) and He (1snp) ~1P~0 states following electron impact on He

摘要

New experimental results are presented on the degree of linear polarization of the extreme ultraviolet (EUV) emission of the neutral and ionized helium following electron impact excitation and ionization-excitation of He atoms. The polarization of the photon emission from decay of the he (1snp) ~1P~0 states with wavelengths of 51.7 to 58.4 nm has been measured for electron impact energies ranging from 30 to 1500 eV. In addition, the polarization for the He~+ (2p) ~2P~0 and He~+ (3p) ~2P~0 states with wavelengths of 30.4 and 25.6 nm, respectively, has been obtained rom threshold (66 eV and 73 eV) to 1500 eV. Furthermore, a comparison of the experimental results with theoretical calculations is provided.