The 3N-6 vibrational modes of a molecule can be sub-subdivided into three general types of deformations. (i) Define these and draw their approximate potential energy functions.  (ii) Order the three types. Start with the one requiring the least energy to animate. (iii) Where are anharmonic modes generally located in the energetic ordering relative to other modes and what other name(s) are they know by?

Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter20: Molecular Spectroscopy And Photochemistry
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The 3N-6 vibrational modes of a molecule can be sub-subdivided into three general types of
deformations.
(i) Define these and draw their approximate potential energy functions. 


(ii) Order the three types. Start with the one requiring the least energy to animate.

(iii) Where are anharmonic modes generally located in the energetic ordering relative to
other modes and what other name(s) are they know by? 


(iv) Discuss the significance of anharmonic modes and why accurately characterising
them is key to precise energetic determinations and to accurately modelling
specificity, selectivity and functionality in chemical phenomena. 

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