For 10 points, identify this principle that governs changes from one vibrational energy level to another in electronic transitions, whose first namesake conducted an experiment that confirmed Bohr's atomic model along with Gustav Hertz.
For a tandem mirror, atoms following this law are located on the outer edges and give rise to a neutral density in the center. Kasha's rule is explained by this law, which allows for rapid excimer formation and can explain the gap between the zero phonon line and the phonon sideband. It allows a process that can be graphically represented by the shift from one parabola representing DA to another representing D+A-. This principle generates a mirror symmetry between the processes of fluorescence and (*) absorption. A "factor" named after this law can be found by taking the indefinite integral of dR times the product of two wavefunctions. This statement actually only weakly governs intensity. For 10 points, identify this principle that governs changes from one vibrational energy level to another in electronic transitions, whose first namesake conducted an experiment that confirmed Bohr's atomic model along with Gustav Hertz.
For a tandem mirror, atoms following this law are located on the outer edges and give rise to a neutral density in the center.
Franck-Condon principle