Single-electron excitation in He+–He
collisions is investigated in the 30–50 keV range, where the excitation cross-sections have
resonance-like maxima. By measuring anticrossing spectra, we show that the levels of He I with are populated effectively and coherently in this energy range. The superposition states of
the excited electron resulting from the collision process are identified as the parabolic Stark
states with the largest electric dipole moments. The results are explained with the
Paul-trap model and saddle dynamics.
By measuring the anticrossing spectra of the 1s4 and 1s5 He I levels, we investigate single-electron excitation in 30-300 keV He + -He collisions. The post-collisional He I states are highly coherent superpositions of spherical states with large electric dipole moments. These superposition states vary gradually with the impact energy from purely parabolic states at 30 keV to superpositions of 2 states at 300 keV. The results indicate that for the whole energy range single-electron excitation should be considered as a process mainly localized in the saddle region of the two-centre Coulomb potential of the (He + ) 2 molecular core. A theoretical model based on the symmetry of the collision system is discussed.
Singlet–triplet anticrossing spectra of the helium isotope 3He have been measured for the first time. These anticrossing spectra differ strongly from those of the isotope 4He due to the hyperfine interaction. We exploited this difference for distinguishing between the excitation of target atoms and the formation of excited projectile atoms by electron capture in experimental investigations on the symmetric collision system He+–He.
In a randomized double-blind crossover study, 10 insulin-dependent diabetic individuals were treated with a commercial brand of neutral, highly purified porcine insulin (PPI) with 30% regular and 70% NPH fractions (Mixtard, Nordisk, Denmark), and with human insulins (recombinant DNA) with 20% regular and 80% NPH fractions, and with 30% regular and 70% NPH fractions. Each of the preparations was given for 4 consecutive days. The human insulin combination with the 20% regular and 80% NPH components showed a similar activity profile as the PPI 30/70 combination. In contrast, the human insulin combination with the 30% regular and 70% NPH fractions produced substantially lower blood sugar concentrations with the associated risk of hypoglycemia.
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