Magnetic sublevel population in 1s-2p excitation of helium by fast electrons and protons

Ionization–excitation magnetic sublevel cross sections for Heþ (2p)P states following fast electron and proton impact

The first experimental magnetic substate scattering-angle-integrated cross sections following ionization–excitation of He(1s) S to Heþ(2p) P in the e þHe collision system have been determined using a combination of total cross sections and polarization fraction measurements in the extreme ultraviolet range. The derived magnetic sublevel cross sections, r0 and r1, for ML 1⁄4 0, 1 have been studi...

Simultaneous ionization-excitation of helium to He„2p... magnetic sublevels by proton impact

Experimental magnetic substate cross section ratios s0 /s1 and scattering angle-integrated cross sections following ionization-excitation of helium to He(2p) P in H1He collisions have been determined, using polarization measurements of emitted radiation in the extreme ultraviolet region in combination with total cross sections, over a wide range of proton velocities ~2–6 a.u.!. These results ar...

Energy and Angular Distribution of Electrons Ejected from Hydrogen and Helium Gas by Protons

Photofragmentation of SiF4 upon Si 2p and F 1s core excitation: cation and anion yield spectroscopy.

We have studied the fragmentation dynamics of core-excited SiF4 by means of soft-x-ray photoexcitation and partial positive and negative ion yield measurements around the Si L2,3-shell and F K-shell ionization thresholds. All detectable ionic fragments are reported and we observe significant differences between the various partial ion yields near the Si 2p threshold. The differences are similar...

Ionization-excitation of helium by fast charged particles.