Standard Reference Materials: Polystyrene Films for Calibrating the Wavelength

摘要

Standard Reference Material (SRM) 1921 is a matte finish polystyrene film and isintended for use in calibrating the wavelength scale of spectrophotometers in the infrared (IR) spectral region from 545.49 cm exp(-1) to 3082.19 cm exp(-1) (18.332 micrometers to 3.2445 micrometers). Thirteen absorption peak positions obtained using a center-of-gravity method are certified. The expanded uncertainty value associated with these peak values are between 0.06 cm exp(-1) and 0.66 cm exp(-1), except for 1.84 at 2850.13 cm exp(-1) and 12.29 at 545.49 cm exp(-1). This publication describes the IR spectrophotometer, instrument calibration, SRM material, measurement procedure, calibration of polystyrene films, and uncertainty determination.