Time-correlated ion formation in the field desorption of hydrogen

Dirks, Joachim; Drachsel, Wolfgang; Block, Jochen H.

doi:10.1016/0039-6028(91)90406-I

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Time-correlated ion formation in the field desorption of hydrogen

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Dirks, Joachim
Fritz Haber Institute, Max Planck Society;

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Drachsel, Wolfgang
Fritz Haber Institute, Max Planck Society;

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Block, Jochen H.
Fritz Haber Institute, Max Planck Society;

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Dirks, J., Drachsel, W., & Block, J. H. (1991). Time-correlated ion formation in the field desorption of hydrogen. Surface Science, 246(1-3), 150-156. doi:10.1016/0039-6028(91)90406-I.

Cite as: https://hdl.handle.net/21.11116/0000-0009-EACD-9

Abstract

Time-correlated ion formation is observed in the field ion current of hydrogen from a tungsten emitter. The simultaneous emission of pairs of ions, where each pair contains two of the three possible ions H⁺, H⁺₂, or H⁺₃, is confirmed by auto- and cross-correlation measurements. From the observed dependence on field strength and hydrogen pressure and supplementary laser induced field desorption experiments we conclude that the time-correlated ion formation is due to electron stimulated field desorption (ESFD). The amount of correlated ions can reach ~ 16% of the total field ion rate for a hydrogen pressure of 10⁻⁵ mbar.