Why does IR spectrum of a compound of mine show a peak more than 100% transmittance??

22 April 2024 1 2K Report

The instrument provided data of the IR spectrum is in %T vs wave number. But the peak is in the 3600 to 2600 cm-1 shows more than 100% transmittance. What are the probable reasons behind it? How can I solve it? The IR was done in ATR. Thank you.

Geoffrey Dent

There was an OH, small aliphatic ch3, ch2 and water vapour in your background spectrum not present in your sample spectrum. This suggest the equipment wasn’t clean when you ran your background

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