# Rovibrational Transitions

### Short Topical Videos

- Rovibrational Energy Levels (Quantum Chemistry)
- Rovibrational Spectra of Diatomic Molecules (Quantum Chemistry)
- Rotation Vibration Interaction (Quantum Chemistry)

### Reference Materials

- Rotational Vibrational Coupling (Wikipedia)
- Rovibrational Spectroscopy (UC Davis)
- Rotational Vibrational Spectroscopy (Wikipedia)

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\subsection{Vibrational Transitions in Molecules}

Our general technique with vibrational transitions is to model them as harmonic oscillators. Thus, they should have the characteristic harmonic energy series: $$E_n=(n+\frac12)\hbar\omega_0$$ For a harmonic oscillator, $\omega_0=\sqrt{k\over m}$. We estimate that since the force for a spring is $k\cdot x$, and that force should be about the Coulomb force on $e^-$'s. If we say that atoms stretch with respect to each other about a Bohr radius: $$ka_0\sim{e^2\over a_0^2}$$ $$\Delta E\big|_{vib\atop trans}\sim Ryd\cdot\sqrt{m_e\over A\cdot m_p}$$ where A is the atomic mass \# of our atoms.

\subsection{Rotational Transitions in Molecules}

The thing to remember is that angular momentum comes in units of $\hbar$.

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