Spectroscopy via diffraction gratings with different spacings

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SUMMARY

The discussion focuses on the impact of diffraction grating line spacing on the observation of emission lines from gases such as Hydrogen and Neon. It is established that closer line spacings in diffraction gratings result in a greater spread of colors, enhancing the ability to resolve closely spaced spectral lines, such as the sodium doublet. An experiment confirmed that increasing the number of lines per millimeter on the grating led to the observation of more distinct colors, contrary to initial assumptions about wavelength limitations.

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  • Understanding of diffraction grating principles
  • Familiarity with emission spectra of gases
  • Basic knowledge of wavelength and visible light
  • Experience with experimental spectroscopy techniques
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  • Research the effects of line spacing on diffraction patterns in spectroscopy
  • Explore the emission spectra of various gases using different diffraction gratings
  • Learn about the design and construction of diffraction gratings
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quantumkiko
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What's the difference when I observe the emission lines of say, Hydrogen or Neon, on two diffraction gratings having different line spacings? Will there be colors that will only be observed in one and not the other? Thank you!
 
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The different spacings will spread out the colors differently. Generally, the closer the spacing, the more spread out the colors will be. So, if before you couldn't resolve a doublet which is very close to each other (e.g. the sodium doublet), you may able to resolve it using a diffraction grating with closer spacing.
 
Thank you! I actually did the experiment and I thought I saw more colors when I changed to a grating having more lines per mm. I also thought that the spacings had become too little for some wavelengths of visible light to pass through, but I was wrong.

Thanks for the answer and have a nice day.
 

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