Self-supporting CVD diamond charge state conversion surfaces for high resolution imaging of low-energy neutral atoms in space plasmas

Neuland, Maike Brigitte; Riedo, Andreas; Scheer, Jürgen; Wurz, Peter (2014). Self-supporting CVD diamond charge state conversion surfaces for high resolution imaging of low-energy neutral atoms in space plasmas. Applied surface science, 313, pp. 293-303. North-Holland 10.1016/j.apsusc.2014.05.206

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Two polycrystalline diamond surfaces, manufactured by chemical vapour deposition (CVD) technique, are investigated regarding their applicability as charge state conversion surfaces (CS) for use in a low energy neutral atom imaging instrument in space research. The capability of the surfaces for converting neutral atoms into negative ions via surface ionisation processes was measured for hydrogen and oxygen with particle energies in the range from 100 eV to 1 keV and for angles of incidence between 6 deg and 15 deg. We observed surface charging during the surface ionisation processes for one of the CVD samples due to low electrical conductivity of the material. Measurements on the other CVD diamond sample resulted in ionisation efficiencies of ~2 % for H and up to 12 % for O. Analysis of the angular scattering revealed very narrow and almost circular scattering distributions. Comparison of the results with the data of the CS of the IBEX-Lo sensor shows that CVD diamond has great potential as CS material for future space missions.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute

UniBE Contributor:

Neuland, Maike Brigitte; Riedo, Andreas; Scheer, Jürgen and Wurz, Peter

Subjects:

500 Science > 520 Astronomy
500 Science > 530 Physics
600 Technology > 620 Engineering

ISSN:

0169-4332

Publisher:

North-Holland

Funders:

[4] Swiss National Science Foundation

Language:

English

Submitter:

Maike Brigitte Neuland

Date Deposited:

26 Sep 2014 11:53

Last Modified:

19 Oct 2015 11:41

Publisher DOI:

10.1016/j.apsusc.2014.05.206

Web of Science ID:

000340689000038

Uncontrolled Keywords:

surface ionisation, chemical vapour deposition diamond, charge state conversion surface, energetic neutral atom imaging, ion scattering, space research

BORIS DOI:

10.7892/boris.58503

URI:

https://boris.unibe.ch/id/eprint/58503

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