Laser Induced Breakdown Spectroscopy

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SUMMARY

The discussion centers on the absence of oxygen lines in the spectrum of metal oxides when analyzed using a 532nm wavelength Nd:YAG laser at atmospheric pressure. Participants suggest that atmospheric oxygen may be reabsorbing photons, and they highlight the importance of sample flux, distance, and spectrometer sensitivity in spectral analysis. Additionally, self-absorption effects in the UV range and the density of air near the plasma are considered potential factors influencing the observed results.

PREREQUISITES
  • Understanding of Laser Induced Breakdown Spectroscopy (LIBS)
  • Familiarity with Nd:YAG laser properties and applications
  • Knowledge of spectrometer setup and sensitivity factors
  • Basic principles of atomic emission spectroscopy
NEXT STEPS
  • Research the effects of atmospheric conditions on LIBS analysis
  • Explore the principles of self-absorption in spectroscopy
  • Learn about optimizing spectrometer sensitivity for better detection
  • Investigate the role of plasma density in spectral readings
USEFUL FOR

Researchers and practitioners in the field of spectroscopy, particularly those focusing on Laser Induced Breakdown Spectroscopy, as well as professionals analyzing metal oxides and atmospheric influences on spectral data.

Farah Ikram
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my question is why oxygen lines does not appear in metal oxides spectrum taken at 532nm wavelength of Nd:YAG laser at atmospheric pressure. and what is the criteria for selecting emission lines for analysis?
 
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Maybe it's oxygen in the atmosphere is reabsorbing those photons?

It would depend on the flux coming from your sample and the distance to and sensitivity of your spectrometer set up.

There might be a more obvious reason, I'm no spectroscopist.
 
you may be right...i'm thinking about the same reason because the self absorption increases in the UV range and oygen spectrum lies in the UV...another thing is that may be the air itself gets too thick near plasma it may also absorb the radiations as u have said
 

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