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H.P. Helm

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Electron impact ionization of (N): Appearance energies of N/sup +/ and N/sup +/

1984
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Cluster properties studied by electron impact ionization

1982
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Properties of the excited states of molecular ions. Final report, 1 October 1977-15 September 1980

1981
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The mobilities of diatomic rare gas ions in their parent gases

1977
- H.P. Helm
- M. T. Elford
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