Quantum Chemistry and Spectroscopy - Quantum Chemistry 6.8 - Rotation-Vibration Interaction

Short lecture on rotation-vibration interaction in the rigid rotor. The harmonic oscillator quantum mechanical model system approximates the vibrational potential energy surface of a diatomic molecule as a parabola. This approximation breaks down severely at long bond distances, as the molecule begins to dissociate. Higher vibrational energy states have greater degrees of anharmonicity as the approximation breaks down. This results in a greater bond length at higher vibrational states, thus a higher momentum of inertia, a smaller rotational constant, and more closely spaced spectral lines. This also causes smaller spacings in the R branch than the P branch in rovibrational spectroscopy. Notes Slide: http://i.imgur.com/TGsSJvI.png --- About TMP Chem --- All TMP Chem content is free for everyone, everywhere, and created independently by Trent Parker. Email: [email protected] --- Video Links --- Chapter Playlist: https://www.youtube.com/playlist?list=PLm8ZSArAXicIlRL7FdtY3GjmKju4ORHIs Course Playlist: https://www.youtube.com/playlist?list=PLm8ZSArAXicL3jKr_0nHHs5TwfhdkMFhh Course Review: https://www.youtube.com/playlist?list=PLm8ZSArAXicLTRn3cJyyU1TiU7n_Pp4X1 Other Courses: https://www.youtube.com/playlist?list=PLm8ZSArAXicIXArfap9Tcb8izqRPvE0BK Channel Info: https://www.youtube.com/playlist?list=PLm8ZSArAXicLlGO4Rvpz-D6vX8MFbOn4V --- Social Links --- Facebook: https://www.facebook.com/tmpchem Twitter: https://www.twitter.com/tmpchem LinkedIn: https://www.linkedin.com/in/tmpchem Imgur: https://tmpchem.imgur.com GitHub: https://www.github.com/tmpchem --- Equipment --- Microphone: Blue Yeti USB Microphone Drawing Tablet: Wacom Intuos Pen and Touch Small Drawing Program: Autodesk Sketchbook Express Screen Capture: Corel Visual Studio Pro X8