In the spectrum of BFz one observes bands at 482; 718; 1370; and 3008 cm-1, Use the four normal mode frequencies w1 = 888.0 cm-1, W2 = 696.7 cm-1, W3 = 1463.3 cm-1, w4 = 480.7 cm-1, to assign the bands (i.e. find quantum number associated with each band). To do this try various options until you find a good match. Do not forget that the observed bands will be somewhat influenced by anharmonicity.