The photodissociation of ethyl iodide at 279.71, 281.73, 304.02 and 304.67 nm has been studied on our new mini-photofragment translational spectrometer with a total flight path of only 5 cm. Some vibra-tional peaks are firstly resolved in the TOF spectra of I*(2P1/2) and I(2P3/2) channels. These vibrational peaks are assigned to the excitation states (ν2 = 0, 1, 2,…) of the umbrella mode (ν2, 540 cm-1) of the photofragment C2H5, and the distribution of the vibrational states is obtained. The dissociation energy has been determined to be D0(C-I)=2.314 ± 0.03 eV. The energy partitioning of the available energy (Eavl=ET+Eint=ET+EV,R) calculated from our experimental data E int /E avl= 22.1% at 281.73 nm, 22.4% at 304.02 nm for the I* channel, and E int /E avl= 25.2% at 279.71 nm, 25.9% at 304.67 nm for the I channel, seem to be more reliable. The photodissociation of ethyl iodide at 279.71, 281.73, 304.02 and 304.67 nm has been studied on our new mini-photofragment translational spectrometer with a total flight path of only 5 cm. Some vibra-tional peaks are resolved in the TOF spectra of I * (2P1 / 2) and I (2P3 / 2) channels. These vibrational peaks are assigned to the excitation states (ν2 = 0,1,2 ...) of the umbrella mode (ν2,540 cm -1) of the photofragment C2H5 , and the distribution of the vibrational states is obtained. The dissociation energy has been determined to be D0 (CI) = 2.314 ± 0.03 eV. The energy partitioning of the available energy (Eavl = ET + Eint = ET + EV, R) from our experimental data E int / E avl = 22.1% at 281.73 nm, 22.4% at 304.02 nm for the I * channel and Eint / E avl = 25.2% at 279.71 nm, 25.9% at 304.67 nm for the I channel, seem to be more reliable.