I have raman spectrums of 3 differents acetic acid in solution :

$$CH_3COOH \qquad \qquad CH_3COOD \qquad \qquad CD_3COOD$$

All the following are hypothesis from me and I would like to know if it's good : The change of one H to one D is only changing the reducted mass and not the force constant since it's not changing the electronic configuration, so the spectrum should be the same but all moved to the lower $cm^{-1}$. However this is not what is observed (specially for the spectrum with 4D) My guess is that the solution is not perfect and some molecules still contain some $H$ and so we are observing a lot of peak at the area of $CD_3$ that shouldn't be if the solution was perfect.

Also, you can see that there is large and low peak at $2350 \; cm^{-1}$ for the spectrum $CH_3COOD$ which is not appearing on other : I don't know how to explain it ; my intuition is that it's coming from the bounding $O-D$

Sorry for bad english I'm not native speaker.

<span class=$CH_3COOH$">

<span class=$CH_3COOD$">

<span class=$CD_3COOD$">

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