Solution (source code)

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= Solution

The <trihydrogen cation> has one breathing <normal mode> and two degenerate in-plane distortion <normal modes>. Rigid translations and rotations do not count as vibrations.

Full derivation: <past-exam-of-the-physics-b-course-of-the-university-of-cambridge/2010/paper-2a/section-a/5/solution>.

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