Abstract
Several molecular ionic species have been observed in spark source mass spectra of mixtures containing the elements calcium, fluorine, oxygen, and silver. Their occurrence is nearly independent of the chemical compound in which these elements are present in the electrodes. Ionic species like CaF +, Ca 2F 3 +, Ca 3F 5 +, Ca 4F 7 +, Ca 2OF + are assumed to form from neutral precursors (CaF 2) n, CaO · CaF 2, and CaF 2 · AgF; other molecular ionic species (Ca 2 +, Ca 2F +, Ca 2F 2 +, CaAg +, CaOF +, CaAgF 2, and CaAgF +) by thermal ionization and/or sputtering processes. In the presence of these molecular ions mass lines of certain interesting elements are interfered with.
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