1. The problem statement, all variables and given/known data Spectroscopic data (rotational-vibrational lines) show that the hydrogen flouride molecule has a vibrational frequency of 7.8x10^14 rad/sec and a moment of inertia of I=1.35x10^-47 kg.m^2. Find the relevant characteristic temperatures of the HF molecule. 2. Relevant equations 3. The attempt at a solution I am completely lost on where to start and what formulas to use! Please help!