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What does RALS stand for?

RALS stands for right-angle light scatter

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However, the most common way of measuring absolute molecular weight is to add an SLS detector e. g. Low Angle Light Scattering LALS, Right Angle Light Scattering RALS or Multi Angle Light Scattering MALS to a GPC/SEC system. By combining SLS with the separation technique you can calculate the absolute molecular weight at any point in the eluting chromatogram and determining the molecular weight of any population in a mixed sample becomes possible.
By 1992, the first commercial light scattering photometer providing a plurality of discrete detectors was introduced. Although the term DLS (differential light scattering) was initially associated with such multiangle detectors (the term is now most commonly used to refer to “dynamic light scattering”), following Beckman’s popularization of the term “LALLS”, MALLS became a common descriptive. The laser reference was finally dropped and MALS has survived. Two angle devices have appeared with the descriptor DALS (dual angle light scattering) or TALS. The classic 90° detection angle is referred to as right-angle light scatter.