An alcohol solution of benzotrichloride was introduced into vacuum as a continuous liquid flow (liquid beam) and was irradiated with nanosecond (similar to 5 ns) and femtosecond (similar to 200 ns) lasers at the wavelength of 274 nm. Ions produced by multiphoton ionization in the liquid beam and ejected from it were analyzed by a reflectron time-of-flight mass spectrometer. The ions produced were assigned to chloroalcoxybenzyl ions, C6H5CCl(OR)(+), and dialkoxybenzyl ions C6H5C(OR)(2)(+) A trace amount of C6H5CCl2+ was observed as well. The mass assignment and the structure of C6H5C(OR)(2)(+) were confirmed by a collision-induced dissociation experiment, where the dominant fragment ion was found to be C6H5C(OH)(2)(+). In comparison with the product ions by the nanosecond and femtosecond lasers, it is concluded that C6H5CCl(OR)(+) and C6H5C(OR)(2)(+) are produced by the reaction of the ionic precursor, C6H5CCl2+ With alcohol, ROH.