Journal of Physics B Atomic Molecular and Optical Physics

Velocity dependence of neutralisation cross sections in collisions of ground state K+, Rb+, Sr+and metastable Sr+(4d) ions with Na atoms

Ludo Vermeeren, Peter De Bisschop, Peter Lievens, R. E. Silverans

Published Oct 28, 1988• 5 citations

Abstract

Charge exchange cross sections for collisions of fast K + , Rb + and Sr + ions with an Na vapour were measured for collision energies ranging from 5 to 30 keV. Sr + (5s) and Sr + (4d) ions providing the first state-dependent data in this mass region. The results are compared with theoretical near-resonance predictions. The application to collinear laser spectroscopy using state-selective neutralisation is discussed.

DOI: 10.1088/0953-4075/21/20/010

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Journal of Physics B Atomic Molecular and Optical Physics

Velocity dependence of neutralisation cross sections in collisions of ground state K+, Rb+, Sr+and metastable Sr+(4d) ions with Na atoms

Ludo Vermeeren, Peter De Bisschop, Peter Lievens, R. E. Silverans

Published Oct 28, 1988• 5 citations

Publisher

Abstract

DOI: 10.1088/0953-4075/21/20/010

Related papers

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Victor A. Kartoshkin

Optics and SpectroscopyNov 1, 201015 citations

A combined optical-pumping--laser-induced-fluorescence method was developed to determine the fraction of metastable-state ions in a

{\mathrm{Ba}}^{+}

beam. This allowed us to measure the ratio of the charge-exchange cross sections for collisions of

{\mathrm{Ba}}^{+}

(6s) and

{\mathrm{Ba}}^{+}

(5d) ions with a sodium vapor for impact energies ranging from 3 to 29 keV. For a collision energy of 5 keV, the ratio of the cross sections for

{\mathrm{Ba}}^{+}

(5d

^{2}

{\mathit{D}}_{3/2}

) and

{\mathrm{Ba}}^{+}

(5d

^{2}

{\mathit{D}}_{5/2}

) was measured. All results are compared to theoretical near-resonance predictions.

We report on a theoretical and experimental study of state-selective differential single-electron transfer cross sections between

{\mathrm{Na}}^{+}

ions and

\mathrm{Rb}(5s,5p)

atoms at collision energies of 2, 5, and 7 keV. A two-center multichannel semiclassical impact parameter close-coupling method with straight-line trajectories was used to obtain single-electron capture amplitudes. By combining with the eikonal approximation, we calculated the angular differential cross sections. These results are compared to the experimental data obtained with Rb targets cooled in a magnetic optical trap. It is shown that there is generally a good agreement between the present calculations and the experiments. In spite of the higher resolution offered from the cold target, the rapid oscillations in the differential cross sections are not resolved by the experiments.