Cadmium telluride as a potential conversion surface

Gasser, Jonathan; Föhn, Martina; Galli, André; Artegiani, Elisa; Romeo, Alessandro; Wurz, Peter (2021). Cadmium telluride as a potential conversion surface. Journal of applied physics, 129(4), 045303. American Institute of Physics 10.1063/5.0033701

[img] Text
5.0033701.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (1MB) | Request a copy

In instruments for low energetic neutral atom imaging of space plasmas, a charge state conversion surface (CS) is used to convert neutral atoms into ions for detection. We investigated a cadmium telluride (CdTe) coated sample as a novel material candidate regarding its suitability to be used as a CS. We measured the efficiency of converting H and O atoms into negative ions by surface scattering, as well as their angular scattering distribution, for energies from 195 eV to 1 keV at 8∘ incidence angle. Also, the energy distribution of scattered particles was recorded for incident O+2 ions, which confirms that molecules are mainly scattered as single atoms. The mean energy loss per atom was about 45%. The negative ion yield from scattering off CdTe was up to 13% for O and about 2% for H, which is comparable to other CS coatings in use. CdTe shows a nearly circular angular scattering cone of width comparable to established CS materials. We conclude that CdTe is a viable CS coating material for ENA instruments in space applications.

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:

Gasser, Jonathan; Föhn, Martina; Galli, André and Wurz, Peter

Subjects:

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

ISSN:

0021-8979

Publisher:

American Institute of Physics

Language:

English

Submitter:

Dora Ursula Zimmerer

Date Deposited:

06 Apr 2021 17:00

Last Modified:

06 Apr 2021 17:00

Publisher DOI:

10.1063/5.0033701

BORIS DOI:

10.48350/153881

URI:

https://boris.unibe.ch/id/eprint/153881

Actions (login required)

Edit item Edit item
Provide Feedback