Brett Williams's Reviews > Molecular Spectra and Molecular Structureinfrared and Raman Spectra of Polyatomic Molecules Volume 2

Molecular Spectra and Molecular Structureinfrared and Raman S... by Gerhard Herzberg
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it was amazing

Marvelous legacy to this Nobel Laureate

This graduate level volume (second of three) picks up where Atkins’ undergraduate Physical Chemistry leaves off. While Atkins’ introduction is delightful, if you want to build working devices, you can’t stop at his approximations. Herzberg (1904-1999) carries on with higher order perturbations allowing your computer model to match measured results. Volume 2 falls short in vibrational anharmonic constants for Fermi-Dennison (multiplication) resonance and summation resonance that occurs between different vibration energy states. Turns out - queer as quantum is - different molecular vibration states produce the same or near same energy. Hence, they repel. (Weird.) Based on the initial vibration-rotation model, you’ll get what I got: euphoric agreement for simple states, disaster for complex combinations. Very sad.

This link to Allen’s free 1990 paper helps halfway, opaque for the other half. While this not free link to Dennison’s 1951 paper (Eq. VI 4) will finish off “most” of the rest. Of course all use different symbols and notation, so have fun with that, per usual. Overall, a really fine, fine text on the physics of molecules.
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Reading Progress

March 9, 2015 – Started Reading
November 26, 2016 – Finished Reading
November 28, 2016 – Shelved

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