We have used cold-target recoil-ion momentum spectroscopy to study electron capture from atomic and molecular hydrogen targets by slow ͑0.3Ͻ v Ͻ 0.95 a.u.͒ O 8+ and Ar 8+ ions. For the atomic hydrogen target, we have performed coupled-channel calculations using an atomic orbital expansion to compare to the experimental results. The Q-value spectra show strong populations of both n = 5 and n = 6 states on the projectile, with a tendency for increasing the population of high-angular momentum states for higher projectile velocity. A strong population of n = 6 is found, a result not previously reported but in good agreement with the present calculations.
Heart rate can be decreased to a similar degree with Q6 and Q24 dosing strategies, with the Q8 dosing strategy being less effective. Q6 dosing is recommended to maintain reduced heart rate throughout dosing periods.
We have investigated impact ionization of He by protons at energies between 20 and 100 keV. Momentum spectra of the ejected electrons were measured for experimentally determined vector impact parameters using cold target recoil ion momentum spectroscopy techniques. At the lowest impact energy, the electron momenta lie close to the saddle point and as the energy increases they slowly move towards the target centre. The measurements are compared with the results of a theoretical calculation carried out using a two-centre momentum space discretization method. Qualitative agreement with the experiment is seen, and systematic disagreements between experiment and theory are discussed.
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