1. The problem statement, all variables and given/known data A molecule is a harmonic oscillator, and has a fundamental frequency of 1000 cm−1 and a reduced mass of 10.0 amu. From this, determine the magnitude of the force constant, and express it in units of aJ ˚A−2 (atto joules per angstrom). 2. Relevant equations ω=√(k/mr) 3. The attempt at a solution My question is about the requested units. Force constants of harmonic oscillators are given as force*distance, no? So the request for the units in energy/distance2 doesn't make sense. Further, using the relevant equation given I end up with amu/cm2, or mass/distance2. I suppose wavenumbers can be counted as energy as well. Even then, you'd end up with J^2*amu or J*amu/cm. The problem, then, is the remaining mass. I'm fairly certain I'm misunderstanding something in this, however. Any help would be appreciated. Edit: Apologies for having to move my thread. This is this first part of a multistep quantum mechanical problem. I guess this part is technically more introductory.