what is the unit of "oscillator strength"

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Basically, this thing is dimensionless, and renormalized to "1". But NWChem gives something like 0.0xxx, I don't believe these is the renormalized version.
Anyone know this? Thank you!

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Oscillator strengths are dimensionless. To compare with experiments you can write this in terms of the integrated absorption coefficient (alpha)

f = (4.32x10^-09 moles cm^2 liter^-1) * alpha

With this strong transitions range from ~ 1.0 to 0 for forbidden ones.

Hope this helps.


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