The Student Room Group

Transmittance in IR spectroscopy

I was just wondering - is the % transmittance (which is obviously the opposite of % absorbance) the same as intensity of the peak, or not? I had an awesome answer to a question till this started plaguing me!

Basically the thing I think I've got is very symmetrical, and that reduces intensity of a band, right? But does it reduce or increase the % transmittance? I think my real question is, "what exactly does the intensity of a peak mean?" I have gone through far too many years of life not quite knowing, apparently...

EXCELLENT, THANK YOU :biggrin:
Reply 1
I dunno what it means in IR, but the intensity of light is how much light there is per unit area. I guess it's the same as % transmittance, except it's not expressed as a %.
Reply 2
More intense band = more absorption/less transmittance
Less intense band = less absorption/more transmittance
Reply 3
Thanks very much, guys!

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