For 10 points, what process, detected by IÂ·R spectroscopy, occurs when nuclei move back and forth?
The "forbidden Q branch" in a "PÂ·QÂ·R" spectrum corresponds to this process. The "group" form of this process identi⎜es irreducible representations that correspond to it by just looking at rows in the character table that transform as a linear or quadratic function of a coordinate. CentroÂ·symmetric molecules cannot have overlapping peaks in spectroscopy that excites this process by causing a change in the polarizability tensor or dipole moment. The anÂ·harmonic Morse potential models the energy required to excite this process, which is oeen reported in inverse centimeters. Nonlinear molecules have "three n minus six" degrees of freedomÂ—or normal modes, such as wagging, scissoring, or bendingÂ—for this process. For 10 points, what process, detected by IÂ·R spectroscopy, occurs when nuclei move back and forth?
The "forbidden Q branch" in a "PÂ·QÂ·R" spectrum corresponds to this process.
molecular vibration(s) [accept word forms such as vibrational; prompt on "molecular motion" or similar answers; prompt on "rovibration" or "libration"; do not accept or prompt on "translation(s)" or "rotation(s)"]