Model Calculations for Molecules
Models played an important part in understanding drift-tube experiments where atomic ions moved through atomic gases. Such models were crucial when computers were primitive, and were abandoned only when advances in quantum mechanics, kinetic theory, and computer hardware and software made it possible (see Chaps. 5 and 6) to make accurate, ab initio calculations. For molecules, we have not reached such an advanced position, as demonstrated in Chap. 8. Hence, we will begin this study of model calculations for molecular systems with atomic models that have been applied to molecular systems, without repeating any of the discussion in Sect. 2.8.3.
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