Vibrational Absorption of Tunneling Molecular Defects in Crystals. II. Tunneling Molecules under Applied Stress (KCl:CN).

摘要

The general considerations about the vibrational absorption of tunneling molecules, developed in Paper I of this work, are applied and tested, using CN defects in KCl. In previous work on this system the vibrational absorption of CN was reported to be strongly broadened by an unresolved tunneling splitting, and to show pure zero-moment changes under applied stress. The tunneling model, however, predicts additionally characteristic anisotropic changes of the spectral shape under applied field or stress for any absorption, broadened by orientational tunneling.