Abstract

The single-electron capture (SEC) process which occurs in ${\mathrm{Ar}}^{8+}$-$\mathrm{Cs}(6s)$ collisions is experimentally studied, in the 0.4--5-keV/amu energy range, by optical spectroscopy in the near UV and visible wavelength range (200--600 nm). The classical-trajectory Monte Carlo (CTMC) method is also used to determine the state-selective electron-capture cross sections. For high collision energies, strong lines corresponding to $\ensuremath{\Delta}n=1$--4 transitions from $n=7$ to 13 states with large angular momentum values of Ar VIII and $\ensuremath{\Delta}n=0$ transitions from $n=5$ states are observed. For low collision energies, together with the lines observed for high collision energies, lines corresponding to transitions from states with low-$l$ values $(10s,$ $11s,$ and $13s)$ are detected. Production cross sections for the most populated levels $(n=9,$ 10, and 11) are determined and compared with the previous experimental data of Martin et al. [Phys. Rev. A 46, 1316 (1992)] and Denis et al. [Phys. Rev. A 50, 2263 (1994)], and with the CTMC calculations. From molecular structure calculations which are performed for the ${{\mathrm{Ar}}^{7+}+\mathrm{Cs}{}}^{+}$ molecular system, our results are analyzed in terms of dynamical couplings between the relevant molecular channels involved in the electron-capture process. Polarization degrees for SEC lines corresponding to transitions between high-$l$ values states are also measured. The comparison with those calculated from the CTMC results provides information about the Zeeman sublevel distributions.

Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call