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Development of a Polystyrene Reference Material for Raman Spectrometer (NMIJ RM 8158-a)
Nobuyasu Itoh, Nobuyasu Hanari1
1National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Central 3, 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8563, Japan.
Summary
This study establishes a reliable method for validating Raman shifts using polystyrene reference materials. The validated Raman shifts offer precise uncertainty values for accurate spectroscopic analysis.
Area of Science:
- Spectroscopy
- Materials Science
- Metrology
Background:
- Raman shift is crucial in Raman spectroscopy but highly sensitive to measurement conditions.
- Stable reference materials are needed for accurate Raman shift validation.
- Existing standards may lack comprehensive uncertainty evaluation.
Purpose of the Study:
- To reliably estimate Raman shift and its uncertainty using a polystyrene disc.
- To provide validated reference values for Raman spectroscopy.
- To assess the suitability of polystyrene as a Raman shift standard.
Main Methods:
- Utilized a HeNe laser and Ne/Ar emission lines for calibration.
- Measured Raman-scattered light from a polystyrene disc.
- Quantified uncertainties from fitting, repeatability, reproducibility, laser stability, resolution, inhomogeneity, and long-term stability.
Main Results:
- Reliably estimated Raman shifts for 11 peaks on a polystyrene disc.
- Achieved expanded uncertainties of 1.1 or 1.2 cm⁻¹ (k=2).
- Obtained reference values comparable to ASTM E1840.
Conclusions:
- Polystyrene discs can serve as effective reference materials for Raman shift validation.
- The comprehensive uncertainty evaluation enhances the reliability of spectroscopic measurements.
- This method provides accurate and traceable Raman shift data.
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