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Quick rotational spectroscopy question(only need ideas/suggestions)

  1. Nov 23, 2011 #1
    1. The problem statement, all variables and given/known data
    Give two reasons why as molecular size increases does it become increasingly difficult to experimentally obtain well-resolved rotational spectra?

    3. The attempt at a solution

    Basically I know one reason. The energy levels become more tightly packed.

    I have another idea and that's that its very unpractical to turn the molecule into its gaseous state.

    I think thats the answers but i wanted to see if anyone had any other ideas

    Thanks :D
  2. jcsd
  3. Jan 19, 2017 #2


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    Science Advisor
    Gold Member

    Those are decent answers. I might also include that, in the absence of a significant degree of symmetry, the molecule can get quite floppy as it gets larger, and some of the low lying vibrational modes might mix with rotational modes and convolute the whole spectrum into a godawful mess.
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