I Frank Condon factors in molecules

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Frank Condon factors are essential in understanding vibrational transitions in molecules, particularly in the context of laser cooling. There is confusion regarding their definition, specifically whether they refer to the vibrational overlap integral itself or its square, which significantly impacts calculations. The convention in molecular physics typically favors using the square of the integral, as this aligns with applications like the Fermi golden rule. Examples from literature consistently support this squared definition in practical scenarios. Clarifying this distinction is crucial for accurate interpretations in molecular studies.
kelly0303
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Hello! I am reading about laser cooling, and I see people talking about the Frank Condon factors. It seems to be just a vibrational overlap integral, but I found different definitions in terms of whether is just the integral or its square (the difference is huge, so it should matter). What is the convention in the molecular physics field?
 
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Can you give examples from the literature you’re reading? I’ve only ever seen the square, because that’s what ends up in the Fermi golden rule calculation.
 

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