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Abstract: Using a very weak electric field to accelerate the photofragment ions, we have constructed a very simple photofragment translational spectrometer with only a 50 mm total flight path, but we can get photofragment translational spectra with high resolution. On this apparatus, we have performed the photodissociation of CF3I at 281.73 nm, and the same laser will ionize I*(2P1/2) via REMPI. Seven well-resolved vibrational peaks were obtained. Six of them are assigned to the umbrella vibrational mode v2=0–5 states of photofragment CF3. The average internal energy is about 21% of the available energy. [Copyright &y& Elsevier]