Guiding and scattering of ions in transmission through mica nanocapillaries
Number of Authors: 3
2016 (English)In: Physical review A, ISSN 2469-9926, Vol. 94, no 3, 032704Article in journal (Refereed) Published
The transition from guiding to scattering in the transmission of 70-keVNe(7+) through mica nanocapillaries of rhombic cross section is studied. Transmitted ions and neutrals are separated and their angular distributions are measured for various tilt angles of the capillaries with respect to the beam direction. The ions and neutrals have different angular profiles and different transmission dependences on tilt angle. The profiles of the transmitted ions are of rectangular shape while bananalike shapes appear for the neutrals. The time evolution measurements during charging up show a shift of the center of the ion angular distribution while that of the neutrals remains fixed. Trajectory simulations are performed by taking the image force and the Coulomb repulsive force from the deposited charge, as well as scattering from capillary walls into account. These show good agreement with the data and how the deposited or image charge deflects and shapes the ionic portion of the beam differently from the neutral part. The experimental separation of the ions from neutrals and their very different behaviors together with simulations gives us further insight into the mechanisms of guiding and scattering in transmission through nanocapillaries.
Place, publisher, year, edition, pages
2016. Vol. 94, no 3, 032704
IdentifiersURN: urn:nbn:se:su:diva-134226DOI: 10.1103/PhysRevA.94.032704ISI: 000382717200007OAI: oai:DiVA.org:su-134226DiVA: diva2:1033553