The quantity k is the force constant for a spring consisting of a line of alternating positive

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The quantity k is the force constant for a “spring” consisting of a line of alternating positive and negative ions. If these ions are displaced slightly from their equilibrium separation r0, they will vibrate with a frequency

(a) Use the values of a, n, and r0 for NaCl and the reduced mass for the NaCl molecule to calculate this frequency. 

(b) Calculate the wavelength of electromagnetic radiation corresponding to this frequency, and compare your result with the characteristic strong infrared absorption bands in the region of about λ = 61 mm that are observed for NaCl.

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Modern Physics

ISBN: 9781429250788

6th Edition

Authors: Paul A. Tipler, Ralph Llewellyn

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