3n - 5 July 8, 2019 16 32 64 128 3n - 5 = 21 3n 5 19 3n 5 6 3n 5 vibrational modes 3n 5 2 3n 5 2n 3n 5 sequence 3n 5 7 3n 5 4 3n 5 n 4 3n 5 8 3n 5 degrees of freedom 3n 5 n 1 3n 5 10
