Low-energy nitrogen ions were produced with gas point discharge, and the ions were accelerated directly by the potential degradation above the cathode into PhCOONa solution. The induced change for UV absorption was measured. After the nitrogen ions impact, PhCOONa solution showed positive reaction with ninhydrin, which indicated that some types of amino group were formed when the nitrogen ions attack the solution. The investigation of infrared spectra further demonstrated that amide and nitroso-compound were the damage products. In general, the present paper clearly demonstrates the chemical modification effects of low energy ions on substances in solution.

Key words: BENZENECARBOXYLIC ACID P, CHEMICAL MODIFICATION, NITROGEN ION, NINHYDRIN, INFRARED SPECTROPHOTOMETRY