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Electron Capture into Excited States for Al8+ + H2 Collisions at 3 keV/amu

Published online by Cambridge University Press:  12 April 2016

M. Mayo
Affiliation:
AGRIPPA GIS CEA/CNRS C.E.N.G. 85 X, 38041 Grenoble, France
D. Hitz
Affiliation:
AGRIPPA GIS CEA/CNRS C.E.N.G. 85 X, 38041 Grenoble, France
M. Druetta
Affiliation:
AGRIPPA GIS CEA/CNRS C.E.N.G. 85 X, 38041 Grenoble, France
S. Dousson
Affiliation:
AGRIPPA GIS CEA/CNRS C.E.N.G. 85 X, 38041 Grenoble, France
J.P. Desclaux
Affiliation:
AGRIPPA GIS CEA/CNRS C.E.N.G. 85 X, 38041 Grenoble, France
S. Bliman
Affiliation:
AGRIPPA GIS CEA/CNRS C.E.N.G. 85 X, 38041 Grenoble, France

Extract

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The MINIMAFIOS ECR source at Grenoble has recently produced stable beams of highly charged Al. We have studied electron capture into excited states for Al8+ ions extracted at 10 kV colliding with an H2 molecular target under single collision conditions. Using a grazing incidence spectrometer covering the region 250 Å to 1100 Å, we have made a relative intensity measurement of the radiative decay from excited (nl) states of Al7+ following the charge exchange collision. The Al7+ spectra show known transitions from the ls22s2p3 excited state. We discuss the presence of the ls22s2p2(4P) metastable state in the incidence Al8+ beam. The spectra also show many transitions which up to now are unidentified, in particular transitions for the wavelength region between 300 and 400Å and that between 600 and 700Å. To identify the transitions, we compare our spectrum with preliminary theoretical wavelengths calculated using the multiconfiguration Dirac-Fock method including transitions from n = 3, 4 and 5. These preliminary results reveal transitions from n = 5 to 4 for the observed spectra in the 600Å region and transitions from n = 4 to 3 for the observed spectra in the 300Å region.

Type
Session 6. Poster Papers
Copyright
Copyright © Naval Research Laboratory 1984. Publication courtesy of the Naval Research Laboratory, Washington, DC.

References

1 Chetioui, A., Delaunay, M., Dousson, S., Geller, R., Jacquotj, B., Hitz, D., Vernhet, D., to be published, Nuclear Instruments and Methods.Google Scholar