Abstract

Standard Reference Material 2036 (SRM 2036) is a certified transfer standard intended for the verification and calibration of the wavelength/wavenumber scale of near-infrared (NIR) spectrometers operating in diffuse or trans-reflectance mode. SRM 2036 <i>Near-Infrared Wavelength/Wavenumber Reflection Standard</i> is a combination of a rare earth oxide glass of a composition similar to that of SRM 2035 <i>Near-Infrared Transmission Wavelength/Wavenumber Standard</i> and SRM 2065 <i>Ultraviolet–Visible–Near-Infrared Transmission Wavelength/Wavenumber Standard,</i> but is in physical contact with a piece of sintered poly(tetrafluoroethylene) (PTFE). The combination of glass contacted with a nearly ideal diffusely reflecting backing provides reflection–absorption bands that range from 15% <i>R</i> to 40% <i>R</i>. SRM 2036 is certified for the 10% band fraction air wavelength centroid location, ^10%B, of seven bands spanning the spectral region from 975 nm to 1946 nm. It is also certified for the vacuum wavenumber ^10%B of the same seven bands in the spectral region from 10 300 cm⁻¹ to 5130 cm⁻¹ at 8 cm⁻¹ resolution. Informational values are provided for the locations of thirteen additional bands from 334 nm to 804 nm.

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