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Question about Intensity?

  1. Apr 8, 2010 #1
    Can someone help me to clear out a few questions about Intensity from spectral lines.

    - I have seen in many reports the unit cm-2 atm-1? Where does this come from?
    - What is the differences between line strength and the absolute intensity if the spectral line?
    - If you measure light from for example a flame with a FTS (Fourier Transform Spectrometer) What unit does the recorded spectrum have? Is this not possible to determine and you simply use arbitrary units.
    - Why is it difficult to measure absolute intensities?
  2. jcsd
  3. Apr 12, 2010 #2
    Anyone that an help me with the question above?

    I have one more question. Is it possible to tune a laser during the cycle of an engine? How fast does it take to tune a laser?
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