A new type of sample holder suitable for Raman difference spectroscopy is described. It can accommodate up to six different samples (~10 μL) contained in capillary cells such as those commonly used in conventional Raman spectroscopy. This system can be readily incorporated in an instrument equipped with a conventional computerized control system and it provides a differential frequency accuracy (±0.03 cm<sup>−1</sup>) which is comparable to that of other existing devices.
Rodrigue Savoie, Serge Alex, and Marc Langlais, "Multisample System for Raman Difference Spectroscopy," Appl. Spectrosc. 40, 553-555 (1986)