Changing the way to do Circular Dichroism – MOS-500 – Spectroscopy – Application Note 26

Abstract

This note shows all benefits from the coupling of a chromatic light source and gratings monochromators over prisms. The combination of the best up-to-date double grating monochromator to the chromatic light source as proposed by the MOS-500 offers the highest perspective of evolution for circular dichroism spectroscopy. This technology offers the best precision and makes the MOS-500 an innovating and revolutionary spectropolarimeter which also cuts off most of running cost involved in competitive instruments.

Introduction

MOS-500 is a circular dichroism spectrometer based on a double grating monochromator for the selection of the working wavelength. In gratings the groove spacing and shape determine the distribution of energy of the diffracted light. Littrow configuration is used where the light is diffracted from the grating back toward the source (see figure 1). They have the advantage of maximum efficiency over a given range of specific wavelengths. Figure 1: Grating in Littrow configuration MOS-500 uses holographic reflection gratings which have a sinusoidal groove profile and are generated by the recording of an interference pattern onto a photoresist-coated substrate.

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