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Problem 1. Normal Modes in One and Two Dimensions The first configuration is confined to one dimensions, the second and third are confined to two
Problem 1. Normal Modes in One and Two Dimensions The first configuration is confined to one dimensions, the second and third are confined to two dimen- sions, answer the following questions: 1. How many degrees of freedom are there in total? How many translational, rotational and vibra- tional? 2. Write the Hamiltonian. Assume a nearest neighbor harmonic interaction, with force constants k as indicated on the figures. 3. Define mass weighted coordinates and calculate the Hessian. 4. Diagonalize the Hessian to find the force constants ; and coordinates Qi of the normal modes. Indicate which modes are translational, rotational and vibrational. k m m m k k k k k k m 0.5m m m k m m k m
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