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An in-beam electron impact mass spectrometer has been modified using a tungsten or platinum filament as an in-beam probe. With this simple device, metalated organic molecular ion peaks of strong intensities are observed under electron impact conditions. New cluster ions, [(CH3CO2) mLi n]+ are detected, where m=3-6 and n=3, 4. Sodium and potassium acetates give stable dimetalated carboxylate ions, and less stable carboxylate ions are formed from benzoates. [ABSTRACT FROM AUTHOR]