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When does narrowing the slit stop improving a spectrum?

  • A.When the absorbance exceeds the linear range
  • B.When the bandwidth is well below the band's own width
  • C.When the detector reaches its maximum sensitivity
  • D.When the source output falls below its rated value

Answer: B

Once the instrument's bandwidth is a small fraction of the band being measured, further narrowing reveals no new structure and only loses light. Detector sensitivity, source output and absorbance range are separate limits. A resolution better than the thing being resolved buys nothing, which is a general principle worth applying before any instrument setting is pushed to its extreme.

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