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Electron transfer in slow collisions of highly charged ions with atoms and molecules
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
1998 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Several spectroscopic methods have been used to study single- and double electron transfer in slow collisions between highly charged ions with neutral atoms and the C60 molecule.

Radiative and non-radiative decay from high-lying doubly-excited states, populated in slow (v = 0.40 a.u.) Ne8+ + He is recorded and analysed with the support of an extensive theoretical data-set. Information about the populated levels and their decay-path is obtained. The experimental data is compared with theoretical data on Be-like doubly-excited neon. Decay from triplet states is observed in both the photon and the electron spectra. This is discussed carefully since it implies a violation of Wigner's spin-conservation rule if the triplet states are not solely caused by double collisions or inter-combination transitions.

Energy-gain distributions for net one and two-electron transfer in slow collisions between highly charged ions and C60 molecules have been measured. Absolute reaction cross sections and information on the transient localisation of the positive charge on the C+60 ion just after the transfer of one electron are obtained.

Energy levels, transition wavelengths, ionization energies, core polarisabilities and Ritz formula coefficients were obtained from photon emission measurements of slow Xeq+ (q = 6,7,8) collisions with neutral atoms.

Single- and double-electron capture processes in slow C4+ + Ne collisions have been studied, combining translational energy-gain and photon spectroscopy. Detailed information is obtained about specific collision mechanisms in this system. It is found that processes in which the target is excited dominate for both single- and double-electron capture.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 1998. , [2], iii, 41 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 333
Keyword [en]
Keyword [sv]
National Category
Physical Sciences
Research subject
URN: urn:nbn:se:uu:diva-854ISBN: 91-554-4118-1OAI: oai:DiVA.org:uu-854DiVA: diva2:171586
Public defence
1998-01-16, Siegbahn Lecture hall, Department of Physics, Uppsala University, Uppsala, 10:00
Available from: 1997-12-26 Created: 1997-12-26Bibliographically approved

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