Abstract
Hybridization in the HCl molecule has been studied in terms of an spd hybrid valence bond function including an ionic term (H+–Cl‐). The results indicate that the quadrupole coupling constant for gaseous HCl (not known experimentally) may be of the order of 100 percent larger than the value reported for the solid. It is found that the quadrupole coupling constant depends principally on the amount of ionic character and does not distinguish among various possible hybridizations. The sign of the dipole moment is discussed briefly.

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