Quick rotational spectroscopy question(only need ideas/suggestions)

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SUMMARY

As molecular size increases, obtaining well-resolved rotational spectra becomes increasingly difficult due to two primary factors: the energy levels of the molecules become more tightly packed, and larger molecules often exhibit significant vibrational modes that can mix with rotational modes. This mixing complicates the spectrum, leading to convoluted results. Additionally, transitioning larger molecules into a gaseous state poses practical challenges that hinder experimental analysis.

PREREQUISITES
  • Understanding of rotational spectroscopy principles
  • Familiarity with molecular energy levels and their packing
  • Knowledge of vibrational modes in larger molecules
  • Experience with gas-phase molecular transitions
NEXT STEPS
  • Research the effects of molecular symmetry on rotational spectra
  • Explore techniques for analyzing tightly packed energy levels
  • Investigate methods for effectively transitioning large molecules to gas phase
  • Learn about vibrational-rotational coupling in spectroscopy
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Chemists, spectroscopists, and students studying molecular spectroscopy who seek to understand the challenges associated with analyzing larger molecules in rotational spectroscopy.

baldywaldy
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Homework Statement


Give two reasons why as molecular size increases does it become increasingly difficult to experimentally obtain well-resolved rotational spectra?


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 that's the answers but i wanted to see if anyone had any other ideas

Thanks :D
 
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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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