Difference: 20151117_MSciSpectrocopyLab (5 vs. 6)

Revision 603 Nov 2016 - JamesAngthopo

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Mapping wavelength with the grating position

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  • A plot of the wavelength against the grating position and the position on the CCD can be seen below:
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  • This process was repeated for the Cadmium, Low and High pressure Mercury lamps
  • The values of the constants were found to be
Parameter/Lamp Cadmium Helium Low Mercury High Mercury
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  • The plots below shows that the width of the line increases towards the edge of the frame.
  • These plots show a scan of a peak in the helium and cadmium spectrum.
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Convolution with Fourier Transform

  • To try to speed up the fitting of the convolution Fourier transfrms were used to convolute the functions instead.
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  • and $\sigma_{X_{\rm{pe}}} = 9.19$
  • This seems a very small error?
  • when plotted they are not visible
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Error.png
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Error.png
 
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Fit.png
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Fit.png
 
  • The $\chi^2 = 25383$, which is very large however even the best fit points don't go through the error bars, as shown below:
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Errorbar1.png
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Errorbar1.png
 
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Errorbar2.png
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Errorbar2.png
 
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Errorbar3.png -- JosephBayley - 17 Nov 2015
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Errorbar3.png -- JosephBayley - 17 Nov 2015
 
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