CHEM 214 Lecture Notes - Lecture 31: Anharmonicity, Potential Energy Surface, Morse Potential
26 Jun 2016
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Identify the dissociation energy for ground state by assigning numerical value that corresponds to depth of well (energy vs. bond length). It determines that there is some equilibrium bond distance re that hydrogen in ground state have in their ground state. For first excited state, it has a smaller dissociation energy and re" is larger (bond is weaker, hence longer). Ground state corresponds to 1s+1s orbital going to form sg. In excited state (hv), bond length is longer, distinct changes in molecule. Morse potential anharmonic oscillator: links between parameter like the dissociation energy, bond length. Many of them are stretches, or similar to stretching modes, but not all. We saw bending modes, where bond angles change in water and co2. intramolecular rotations are also types of vibrational modes. For molecules that can take on different conformations like this, the different forms are called conformers.
