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FT-IR Spectroscopy

  • Page ID
    293726
  • CHEM341. Instrumental Analysis

    In-Class Exercise

    Exercise – Camphor and FT-IR parameters

    1. Previously, I collected camphor’s FT-IR spectrum using the ATR accessory under a variety of settings.

      The first spectrum was collected using the parameters values below:

      Number of scans:  ___1___

      Resolution (cm-1):  ___1___

      Optical speed (cm/s):  ___0.4747___

      Apodization function: ___Happ-Genzel____

       

    1. What happens when we change the resolution from 1 to 4 to 32 (all other parameters stay the same)?





       
    2. What happens when we change the number of scans from 1 to 4 to 32 (all other parameters stay the same)?




       
    3. Why would we also have to rerun the background spectrum after changing parameters?




       
    4. How do the following settings impact FT-IR spectra?

      Number of scans:



       

      Resolution (cm-1):



       

      Apodization function:




       

    5. What factors determine the time required to collect FT-IR spectra?




       

    Now, we’ll look at the interferogram (e.g., the raw data!)

    1. What do the interferogram axes represent?




       
    2. How do the number of data points in the interferogram change as resolution increases?







       

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