Production of negative ions on graphite surface in H2/D2 plasmas: experiments and SRIM calculations

G. Cartry, A. Ahmad, M. Carrere, J.M. Layet, L. Schiesko, C. Hopf, R.A.H. Engeln

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In previous works, surface-produced negative-ion distribution-functions have been measured in H2 and D2 plasmas using graphite surfaces (highly oriented pyrolitic graphite). In the present paper, we use the srim software to interpret the measured negative-ion distribution-functions. For this purpose, the distribution-functions of backscattered and sputtered atoms arising due to the impact of hydrogen ions on a-CH and a-CD surfaces are calculated. The srim calculations confirm the experimental deduction that backscattering and sputtering are the mechanisms of the origin of the creation of negative ions at the surface. It is shown that the srim calculations compare well with the experiments regarding the maximum energy of the negative ions and reproduce the experimentally observed isotopic effect. A discrepancy between calculations and measurements is found concerning the yields for backscattering and sputtering. An explanation is proposed based on a study of the emitted-particle angular-distributions as calculated by srim.
Originele taal-2Engels
Artikelnummer063503
Pagina's (van-tot)1-10
TijdschriftPhysics of Plasmas
Volume19
Nummer van het tijdschrift6
DOI's
StatusGepubliceerd - 2012

Vingerafdruk

negative ions
graphite
ion distribution
distribution functions
backscattering
sputtering
deduction
hydrogen ions
angular distribution
methylidyne
computer programs
atoms
energy

Citeer dit

Cartry, G. ; Ahmad, A. ; Carrere, M. ; Layet, J.M. ; Schiesko, L. ; Hopf, C. ; Engeln, R.A.H. / Production of negative ions on graphite surface in H2/D2 plasmas: experiments and SRIM calculations. In: Physics of Plasmas. 2012 ; Vol. 19, Nr. 6. blz. 1-10.
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abstract = "In previous works, surface-produced negative-ion distribution-functions have been measured in H2 and D2 plasmas using graphite surfaces (highly oriented pyrolitic graphite). In the present paper, we use the srim software to interpret the measured negative-ion distribution-functions. For this purpose, the distribution-functions of backscattered and sputtered atoms arising due to the impact of hydrogen ions on a-CH and a-CD surfaces are calculated. The srim calculations confirm the experimental deduction that backscattering and sputtering are the mechanisms of the origin of the creation of negative ions at the surface. It is shown that the srim calculations compare well with the experiments regarding the maximum energy of the negative ions and reproduce the experimentally observed isotopic effect. A discrepancy between calculations and measurements is found concerning the yields for backscattering and sputtering. An explanation is proposed based on a study of the emitted-particle angular-distributions as calculated by srim.",
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Cartry, G, Ahmad, A, Carrere, M, Layet, JM, Schiesko, L, Hopf, C & Engeln, RAH 2012, 'Production of negative ions on graphite surface in H2/D2 plasmas: experiments and SRIM calculations', Physics of Plasmas, vol. 19, nr. 6, 063503, blz. 1-10. https://doi.org/10.1063/1.4725188

Production of negative ions on graphite surface in H2/D2 plasmas: experiments and SRIM calculations. / Cartry, G.; Ahmad, A.; Carrere, M.; Layet, J.M.; Schiesko, L.; Hopf, C.; Engeln, R.A.H.

In: Physics of Plasmas, Vol. 19, Nr. 6, 063503, 2012, blz. 1-10.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

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T1 - Production of negative ions on graphite surface in H2/D2 plasmas: experiments and SRIM calculations

AU - Cartry, G.

AU - Ahmad, A.

AU - Carrere, M.

AU - Layet, J.M.

AU - Schiesko, L.

AU - Hopf, C.

AU - Engeln, R.A.H.

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AB - In previous works, surface-produced negative-ion distribution-functions have been measured in H2 and D2 plasmas using graphite surfaces (highly oriented pyrolitic graphite). In the present paper, we use the srim software to interpret the measured negative-ion distribution-functions. For this purpose, the distribution-functions of backscattered and sputtered atoms arising due to the impact of hydrogen ions on a-CH and a-CD surfaces are calculated. The srim calculations confirm the experimental deduction that backscattering and sputtering are the mechanisms of the origin of the creation of negative ions at the surface. It is shown that the srim calculations compare well with the experiments regarding the maximum energy of the negative ions and reproduce the experimentally observed isotopic effect. A discrepancy between calculations and measurements is found concerning the yields for backscattering and sputtering. An explanation is proposed based on a study of the emitted-particle angular-distributions as calculated by srim.

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