Fitk [fi:tik] he kaupapa mo te tukatuka raraunga me te raina-kore te tika o te pihinga.

I whakamahia tuatahi

• na kaiputaiao ka tātari i nga raraunga mai i te paheketanga o te paura, te chromatography, te photoluminescence me te whakaahua hikohiko, te infrared and Raman spectroscopy, me etahi atu tikanga whakamatautau,

• kia uru ki nga tihi - nga mahi ahua pere (Gaussian, Lorentzian, Voigt, Pearson VII, Gaussian bifurcated, EMG, Doniach-Sunjic, etc.),