CHEM341. Instrumental Analysis In-Class Exercise Exercise – Camphor and FT-IR parameters 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 ____ What happens when we change the resolution from 1 to 4 to 32 (all other parameters stay the same)? What happens when we change the number of scans from 1 to 4 to 32 (all other parameters stay the same)? Why would we also have to rerun the background spectrum after changing parameters? How do the following settings impact FT-IR spectra? Number of scans: Resolution (cm -1 ): Apodization function: What factors determine the time required to collect FT-IR spectra? Now, we’ll look at the interferogram (e.g., the raw data!) What do the interferogram axes represent? How do the number of data points in the interferogram change as resolution increases?