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Possible Optical Etaloning for Zn (1) 213.857 nm spectra

Question asked by shanegrant on Apr 22, 2020
Latest reply on Apr 23, 2020 by shanegrant

Hi everyone,

 

Optical Etaloning is generally an issue for back-thinned CCD detectors in NIR spectroscopy which occurs due to reflection of photons from the rear of the detector. As light in the NIR region has more penetrating ability this is why the issue is so pronounced for NIR spectroscopy.

 

We've observed that similar interference fringes occur for the Zn 213.857 spectral line for the uncorrected spectra when a series of samples/standards were run using MP-AES.

shows the uncorrected/ non-blank subtracted intensity in three standards (0.1-1 ppm) and a sample (standard addition calibration) whereas Figure 2 shows the corrected spectra. The issue is corrected for by the MP Expert software however I'm interested in hearing from anyone who has also noticed this effect for the Zn 213.857 spectral line?

 

Thanks,

 

Shane Grant

Figure 1 shows the uncorrected/ non-blank subtracted intensity in three standards (0.1-1 ppm) and a sample (standard addition calibration) whereas Figure 2 shows the corrected spectra. The issue is corrected for by the MP Expert software however I'm interested in hearing from anyone who has also noticed this effect for the Zn 213.857 spectral line?

 

Thanks, 

Shane Grant

 Figure 1: Total intensity (no correction) at 213.857 nm

 Figure 2: Total intensity (auto background correction and blank subtract at 213.857 nm

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