Computational laboratory oscillator

The long-range nature of the Coulomb forces in dipolar systems implies, however, the existence of collective excitations, so-called dipolarons [56], that are analogous to the plasma oscillations (plasmons). Such excitations were indeed found in computer simulations [57]. However, the permittivities of the laboratory liquids are usually too small to render this effect important [29]. 

The point of these rather tedious calculations is that the harmonic oscillator approximation brings about a very small error in the thermal correction AAhyd H29% in the ethene-ethane hydrogenation. The computed heat capacities are probably reliable over a temperature range of 50 K or so. Further, the enthalpy of hydrogen itself is insensitive to temperature so we may take experimental determinations of A hydH carried out under normal laboratory conditions as essentially the same as Ahyd- 298 ... 

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