Scienta R3000: non-linear intensity scale

R3000 XPS Intensity scale calibration

Note: All calibration curves were done with detector area set to 640x384 px², where 640px corresponds to full x (energy) scale, 384px to Y-(angular) scale between 53 and 436px.

Fixed Mode (Calibration → Voltages...→ Area)

Swept Mode

Graphs in higher resolution.

Approximate relation between intensity in swept and fixed mode (full detector range):

SES, Igor Pro:
Cps = C / n/ StepTime
where,
Cps = couts per second in fixed mode ( approximately what we see in Calibration → Voltages →Area)
C= counts acquired in swept angular mode
n = number of sweeps

KolXPD has a function to correct detector non-linearity once the calibration file is provided

1. Make sure the spectra are measured in swept, angular, angle-integrated mode and saved as txt files.
2. Set following Load options, keep the line with the calibration file path empty in this step.

 

3.  Open spectrum in KolXPD
4.  Multiply the spectrum by the Io value. (If Io signal was recorded, the normalization to Io must be turned back before appying the non-linearity calibration curve).

5. Go to Operations → Correction for non-linearity - calibration wave

6. Select file with the calibration data (IntensityCalibration2022.txt or IntensityCalibration2015.txt for older data), then click OK.

7. Normalize to Io (Divede by the Io value).