NaCl molecule and transitions

1. The problem statement, all variables and given/known data
A molecule of NaCl has a reflective potential ##C/r^n##, where ##n=35##. What is the frequency of radiated photon at oscillating transition of the distance between the atoms is ##r_0=0.236nm##. And what is the frequency if the transition is rotational?

2. Relevant equations

##M(Na)=23kg/kmol## and ##M(Cl)=35kg/kmol##.

3. The attempt at a solution

I have no idea what to do here. I am guessing it goes something like

##\frac{C}{r^n}+\hbar \omega (n+1/2)=h\nu ##

But even if that is ok, I can’t see a way to determine ##C##. This has to be something with units ##eVm^{35}## ????

Could anybody please help me a bit?

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