Search Results (4 total)

Spectra of L x rays emitted by 6- and 8-MeV/u Xe ions interacting with a variety of solid targets have been measured with a curved-crystal spectrometer. The spectra displayed an overall structure consisting of six strong peaks which were fairly well resolved for low-Z targets (Z₂=3–6), but broadened into two featureless groups for higher-Z targets. The main components were identified as Lα₁ and Lβ₁ pairs associated with initial-state configurations having one to six L-shell vacancies. Detailed spectral analysis provided estimates of the average projectile charges and the average L- and M-electron populations inside the solids.

Experimental resonant transfer and excitation (RTE) cross sections were measured for lithiumlike carbon ions in the energy range 5–9 MeV incident on a lithium vapor target. Transfer excitation populates the 1s2s2p^{2 3}D state predominantly. Subsequent Auger decay of this state to the ground state is studied in high resolution using a 0° electron spectrometer. The measured single-differential cross sections at different projectile energies were compared with theoretical calculations based on the impulse-approximation formulation of RTE. The results of these experiments show that while the contribution of the target valence electron is consistent with impulse-approximation theory, no contribution to RTE by the core electrons is seen.

Auger electrons emitted from doubly excited states of C⁴⁺(2l2l’,2l3l’,2l4l’,2l5l’) formed by transfer excitation in collisions of C⁵⁺(4–10 MeV) with H₂ and He were studied using high-resolution zero-degree Auger electron spectroscopy. The KLL, KLM, KLN, and KLO resonant-transfer excitation (RTE) cross sections were measured. The impulse approximation theory with alignment and interference effects taken into consideration was found to be in reasonable agreement with the experimental data. The theory was normalized by a typical factor of 0.65 to obtain the best fits to the data. The RTEA resonance strengths were evaluated to investigate the n dependence (n=2,3,4,5) of RTEA, which is RTE followed by Auger electron emission.

In a recent publication [M. Schulz et al., Phys. Rev. Lett. 62, 1738 (1989)] experimental evidence for a new process two-electron transfer with excitation, was reported. In this paper we describe a higher-resolution version of the experiment, in which two-electron transfer with excitation was not observed.