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How much sample does a typical infrared measurement require?

  • A.A single crystal of known orientation
  • B.A milligram or less
  • C.Several grams
  • D.About a hundred millilitres

Answer: B

A pellet or an attenuated total reflectance measurement needs a milligram or less, and a microscope accessory works with far less again. Grams and hundreds of millilitres are quite unnecessary, and no oriented crystal is required except in specialised polarised work. Small sample requirement and non-destructiveness together are why the technique is so often the first run on an unknown.

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