Usually, fwhm considered about 3000 cm-1 in many papers, but this is a very big number in comparison with the corresponding value for Gaussian broadening, in text books--it is about 0.05 cm-1 for example.
I may be excused if I am proved wrong: FWHM in Gaussian broadening is of the order of 3000cm^-1 while 0.05 PIXEL is its value of Chroma shift.
Dear Manohar,
thanks for your consideration, but can you explain more......
In the beginning, the aperture of UV spectrometers were designed in such a way so that 3648 waves; each of wave length one nm can naturally pass. So the natural line with of any peak should be 3648 nm which when converted into cm-1 comes out to be=2741.2.
Now:
300 pixels=1 inch=2.54 cm; so 1 cm=118.11 pixels. In UV-Vis. the line width
lies in between 0.035 -0. 05 pixel. Let us take average value to be 0.043 pixel.
Now 118.11 pixel=1cm; so 0.043 pixel= 0.0003641 cm; convert into cm-1 =2746.5.
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