The eem_raman_normalisation wants to normalize based on excitation of 350nm, but Aqualog outputs data for ex = 351 nm.

A suggestion would be to add the condition that if manucafturer: Aqualog == TRUE then use ex == 351
index_ex <- which(blank$ex == 351)

Also note spelling of manucafturer

We are able to get Raman area output when setting a local function to use ex==351.

Thanks
Mark