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I am coming from a chemical background and currently work in the field of vibrational spectroscopy. When I talk to fellow physicists or chemists I always encounter the same question. "Why are the vibrational modes of methyl- and methylenegroups are called r and d modes".

Does this have a group theory background? Can someone elaborate on that?

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  • $\begingroup$ Can you show a reference/ webpage which shows r and d modes? What is the context? $\endgroup$
    – ACR
    Commented Mar 2, 2021 at 16:18
  • $\begingroup$ Vibrations In this picture i illustrated the methyl and methylene stretching vibrations. $\endgroup$
    – Tim
    Commented Mar 25, 2021 at 12:23
  • $\begingroup$ Where is the reference to this picture? $\endgroup$
    – ACR
    Commented Mar 25, 2021 at 16:11

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