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baltimorebest

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## Homework Statement

The energy of a rotator ( a dumbbell-shaped object) is given by L^2/2I, where L is the angular momentum and I is the rotational inertia (moment of inertia) of the dumbbell. Consider an HCl molecule, in which the atomic weights of H and Cl are 1 and 35, respectively, and their internuclear separation is 0.127 nm. Calculate the energy required to excite the molecule from the ground state to the first rotational excited state.

## Homework Equations

## The Attempt at a Solution

All I know is that the equation E

_{1}-E

_{0}= (h_bar)

^{2}/mR

^{2}is the proper equation for diatomic molecules. However I am not sure how to apply that idea to a case where the molecule is like the one in this problem.