Worksheet: Spectral Line Widths

In this worksheet, we will practice measuring the full-width-half-maximum of a spectral line and determining the effect of noise and background profile.

Q1:

Why are the peaks in a UV–Vis spectrum broad?

  • AThe vibrational and rotational transitions are superimposed on the electronic transitions.
  • BThe detectors cannot differentiate specific wavelengths but rather give a range of possible wavelengths.
  • CThey represent a Boltzmann distribution, where some molecules become excited before others.
  • DElectronic transitions occur slowly with respect to the instrumental time scale.

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