The peak energies of the fits of individual measured V Kβ spectra
Figure 8. The peak energies of the fits of individual measured V Kβ spectra. Each of the seven lines represents an independently measured set of results from the full calibration series, derived by methodical stepping of the spectrometer arm length so that the profile stepped across the detector area. The variance is larger than the point precision, indicating sources of systematics. The characterization function drifts off towards the edges of the detector, where vignetting or other loss of efficiency may affect the calibration. Further, some of the linked series have offsets, whether from minor hysteresis or e.g. temperature variations. The overall consistency and hence robustness of the independent measurements yields a final pooled uncertainty of 0.0184 eV or 3.4 ppm.
Transition metals have Kα and Kβ characteristic radiation possessing complex asymmetric spectral profiles. Instrumental broadening normally encountered in x-ray experiments shifts features of profiles used for calibration, such as peak energy, by many times the quoted accuracies. We measure and characterize the titanium Kβ spectral profile. The peak energy of the titanium Kβ spectral profile is found to be 4931.966 ± 0.022 eV prior to instrumental broadening. This 4.5 ppm result decreases the uncertainty over the past literature by a factor of 2.6 and is 2.4 standard deviations from the previous standard. The spectrum is analysed and the resolution-free lineshape is extracted and listed for use in other experiments. We also incorporate improvement in analysis applied to earlier results for V Kβ.