f(m1+ mo 12 2TC m1×m2 nnu e v=the frequency in cm-l f= the force constant a c=the velocity of light ⑨DOrganic Chemistry Organic Chemistry Xiamen Xiamen University University f(m 1+ m 2 ) m 1 × m 2 ν ~ = 2 π c 1 ν ~ = the fr equen cy i n c m-1 f = the fo rce c onstant c = th e v elo c ity o f ligh t