Digital normalization of iodine filter structure in quasielastic light scattering

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Abstract
A molecular iodine filter may be used to reduce the elastic component in a light scattering experiment by several orders of magnitude. However, this introduces extraneous structure into the spectrum due to subsidiary iodine absorptions. A technique is reported here to compensate quantitatively for this structure by a digital normalization scheme based upon a tandem pressure‐scanned Fabry‐Perot interferometer interfaced to a minicomputer. This technique has allowed the extraction of quantitative line‐shape information in studies of low‐energy (0–3.0 cm−1) excitations in both crystalline and amorphous solids.