Swift heavy ion

Add links
Source: Wikipedia, the free encyclopedia.

Swift heavy ions are the components of a type of particle beam with high enough energy that electronic stopping dominates over nuclear stopping.[1][2] They are accelerated in

Ion tracks can be produced in many amorphizing materials, but not in pure metals, where the high electronic heat conductivity dissipates away the electronic heating before the ion track
has time to form.

Definition

Heavy ion beams are generally described in terms of their energy in

Mega electron volts (MeV) divided by the mass of the atomic nucleus, written "MeV/u". In order for an ion beam to be considered "swift", the constituent ions should be carbon or heavier, and the energy such that the beam particles have a velocity comparable to the Bohr velocity.[3]

Ion track formation

Molecular Dynamics simulation of a swift heavy ion track
in crystalline quartz, producing a cylindrical amorphous track in the material. Image size 17 nm × 13 nm.

The mechanisms by which

thermal spikes[4][5]
in the sense that they lead to strong lattice heating and a transient disordered atom zone. However, at least the initial stage of the damage might be better understood in terms of a Coulomb explosion mechanism.[6] Regardless of what the heating mechanism is, it is well established that swift heavy ions typically produce a long nearly cylindrical track of damage in insulators,[1][4] which has been shown to be underdense in the middle, at least in SiO2.[7][8]

Applications

Swift heavy

Ion tracks in polymers can be etched to form a nanometer-thin channel through a polymer foil, so called track etch membranes. These are in industrial use.[9]

Irradiation of polyimide resists have potential to be used as templates for nanowire growth.[10] Tracks can also be used to sputter materials.[11][12] They can also be used to elongate nanocrystals embedded in materials.[13][14][15] SHI irradiation can also be used for structural modification of nanomaterials.[16][17]

References

  1. ^ a b c Kanjijal, D. (2001). "Swift heavy ion-induced modification and track formation in materials" (DjVu). Current Science. 80 (12): 1560.
  2. ^ M. Toulemonde, W. Assmann, C. Dufour, A. Meftah, F. Studer, and C. Trautmann, Experimental phenomena and thermal spike model description of
    ion tracks
    in amorphisable inorganic insulators, Mat. Fys. Medd. Kong. Dan. Vid. Selsk. 52, 263 (2006).
  3. S2CID 210165042
    .
  4. ^
    PMID 10010146
    .
  5. PMID 11030972
    .
  6. S2CID 11034531
    .
  7. PMID 18999762
    .
  8. S2CID 19102268
    .
  9. ISSN 0168-583X
    .
  10. ISSN 0168-583X
    .
  11. PMID 10010379
    .
  12. ISSN 0168-583X
    .
  13. ISSN 0168-583X
    .
  14. ISSN 0168-583X
    .
  15. ISSN 1098-0121
    .
  16. ^ Structural, functional and magnetic ordering modifications in graphene oxide and graphite by 100 MeV gold ion irradiation, Vacuum, Volume 182, December 2020, 109700, DOI: https://doi.org/10.1016/j.vacuum.2020.109700
  17. ^ Mendoza, C., S. Peuget, T. Charpentier, M. Moskura, R. Caraballo, O. Bouty, A. H. Mir, I. Monnet, C. Grygiel, and C. Jegou. "Oxide glass structure evolution under swift heavy ion irradiation." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 325 (2014): 54-65. https://doi.org/10.1016/j.nimb.2014.02.002
Retrieved from "https://en.wikipedia.org/w/index.php?title=Swift_heavy_ion&oldid=1169637809"