Abstract

The results recently obtained by Mills and Robiette on local-mode effects in H 2O, NH 3 and CH 4 type molecules are extended to ethene (C 2H 4) and propadiene (C 3H 4) type molecules. General relations among the anharmonic x rs constants and the Darling-Dennison K rrss constants for the stretching vibrations are derived, called “ x, K relations”, which allow local-mode effects to be generated by adding the appropriate anharmonic and Darling-Dennison constants to the familiar normal-mode model of molecular vibrations. The general utility of x, K relations is discussed, and the results are reviewed for the molecular types for which they have so far been derived.

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