Infrared spectroscopy background correction

Infrared spectroscopy is one of the techniques most frequently coupled to SFE — it accounts for more than 30% of reported SFE hyphenated methods — which is unsurprising as it is one of the most powerful tools available for the elucidation of molecular structures. The specificity of IR spectral information is highly useful for the real-time monitoring of SFE processes with qualitative and quantitative purposes [125]. However, the partial transparency of supercritical CO, in the IR region — it exhibits strong absorption bands at 3800-3500,2500-2150 and below 900 cm — calls for careful background correction. 

---