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Evidence of Sequentially Formed Charge Patches Guiding Ions through Nanocapillaries
Stockholm University, Faculty of Science, Department of Physics. (Atomic physics)
Stockholm University, Faculty of Science, Department of Physics. (Atomic physics)
Stockholm University, Faculty of Science, Department of Physics. (Atomic physics)
2008 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 101, no 22, 223202- p.Article in journal (Refereed) Published
Abstract [en]

We investigated the time evolution of the dynamically shifting distribution of 7 keV Ne7+ ions guided through nanocapillaries in SiO2. We present evidence for a small number of charge patches, formed sequentially in the charging-up process, guiding the ions. We show that the charge patches are distributed along the whole length of the capillaries and that they are maintained in the equilibrium state of transmission. The interpretations are supported by model calculations.

Place, publisher, year, edition, pages
2008. Vol. 101, no 22, 223202- p.
National Category
Physical Sciences Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-42175DOI: 10.1103/PhysRevLett.101.223202ISI: 000261214400020OAI: oai:DiVA.org:su-42175DiVA: diva2:344260
Available from: 2010-08-18 Created: 2010-08-18 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Guiding of highly charged ions through insulating nanocapillaries
Open this publication in new window or tab >>Guiding of highly charged ions through insulating nanocapillaries
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis contains experimental work on guiding of highly charged ions through insulating nanocapillaries. We have studied the time evolution of angular distributions of transmitted ions under well defined initial conditions: already charged, as well as fully discharged nanocapillaries, by using a two-dimensional position sensitive Micro Channel Plate detector with a data acquisition system working in event mode. Time-dependent features in the ion-guiding properties have been found. For the initially discharged capillaries, a shift and broadening of transmitted angular distribution have been observed in the charge-up process. This is interpreted by the formation of charged patches downstream of the entrance patch. We have, with the help of a model calculation, quantitatively derived distinct charge patterns, resulting in the time evolution of the transmitted angular distributions. We show that all charge patches are maintained in the stationary state of transmission by the followed discharging and recharging measurements. For already charged nanocapillaries, a double peak structure in the angular distribution has been found, which is attributed to a memory effect and the re-arrangement of charge patches. When the tilt angle of the capillaries is changed, the existing charge patches from the previous tilt angle can affect the ion trajectories and the formation of new patches.

The preliminary results of highly charged ions transmitted through muscovite mica capillaries of rhombic cross section are also presented in this thesis. We have shown the transmission profiles for various orientations of the rhombi. A rectangular shape of the transmission profile has been found. We have performed a simulation by considering the image force from the four sides of the rhombus. To our surprise, this effect gives an angular distribution that agrees well with the transmission profile obtained by the experiment.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2010. 64 p.
National Category
Physical Sciences Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-42181 (URN)978-91-7447-132-8 (ISBN)
Public defence
2010-09-20, FA32, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (English)
Opponent
Supervisors
Note
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: Submitted.Available from: 2010-08-30 Created: 2010-08-18 Last updated: 2010-08-20Bibliographically approved

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