So far, we have discussed the states of atoms and molecules, with no mention of processes that may change these states. We have showed how energies and other properties of the time-independent states of atoms and molecules may be calculated. Now, we discuss change or time dependence. This means that we return to a topic mentioned at the very beginning of the book, when we discussed how spectroscopy, through Bohr’s postulates, led to recognition that quantum-mechanical systems can exist only in states with certain energies. Our aim now is to derive Bohr’s rules.
KeywordsDipole Moment Quantum Number Harmonic Oscillator Selection Rule Transition Dipole
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