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**Problem:**

The adjacent lines in the pure rotational spectrum of

^{35}CI

^{19}F are separated by a frequency of

1.12 x 10

^{10}Hz. What is the equilibrium separation of the atoms in this molecule?

**The attempt at a solution**

So, the equation I think I need to use to find the equilibrium separation is I = [itex]\mu[/itex]r

_{0}

^{2}

But I don't know how I can find the inertia,as I don't know how the frequency and inertia are linked?

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