Abstract Kinetic energy release values T (50%) for the collision-induced formation of the p- nitrobenzoate and p-nitrophenoxide anions from the molecular anions of pO 2 NC 6 H 4 COOC 6 H 4 Rp and pO 2 NC 6 H 4-OC 6 H 4 Rp respectively are small and relatively insensitive to the nature of the substituent RT (50%) values for the elimination of R?(R= alkyl) from O 2 NC 6 H 4 OR molecular anions range from 0.4 to 0.01 eV, and are ...