SEARCH Articles Figures Tables Absorption infrared Absorptivity, infrared IRRAS IRRAS (infrared reflection-absorption IRRAS spectroscopy Infrared absorption spectroscopy Infrared reflectance spectroscopy Infrared reflectance-absorption Infrared reflectance-absorption spectroscopy Infrared reflection-absorption spectroscopy Infrared reflection-absorption spectroscopy IRRAS Infrared reflective PM-IRRAS PMS Reflectance spectroscopy Reflection infrared spectroscopy Reflection spectroscopy Reflection-Absorption Spectroscopy (IRRAS) Reflection-absorption infrared Reflection-absorption spectroscopy Reflectivity spectroscopy