△G 12v P=e RT v: eigenfrequ ency of vibration △G p=e/RT -(4G+4G1 T=ve RT=ve/RT ∠H RT ∠H D RTRT G P e * 1 − = o v P    = =   1 2 2  o : eigenfrequ ency of vibration RT Gv P e − 3 = R T H R T H R S o R T G o R T G G o D e e e e e v           − − − + − = =  = =  ( ) ( ) * *