Difference: 20160129_MSciSpectrocopyMeeting ( vs. 1)

Revision 129 Jan 2016 - JosephBayley

Line: 1 to 1

Added:

>
>

META TOPICPARENT	name="StewartBoogertSpectroscopy2015"

Fitting

For numerical way try doubling the x range
look at running the fit for more iterations to get correct value
wings have some other complicated structure
restrict $\gamma$ and $\sigma$ to be positive and put bounds on parameters
run the fit to get good guesses to speed up the fitting process
Look at the published vega lines and determine whether parameters are similar
look at eloide [http://atlas.obs-hp.fr/elodie/] spectra,
- look at data file
- convolute with our instrumental response and compare to our fit
Plot a vertical dotted line for the real value of $\lambda$
Look at how $\sigma$ scales with the central value of the line
look at finding physical parameters from the $\sigma$ and $\gamma$

Errors

think about what is causing the fluctuation within the lamp
Look at using a larger gain, as could be an underestimate
could be the noise of the electronics,
- Look at the errors when the CCD is cooled right down

-- JosephBayley - 29 Jan 2016

META FILEATTACHMENT	attachment="latexd7d62a61c5d5f95dcc65ab503d7d8b10.png" attr="h" comment="" date="1454078100" name="latexd7d62a61c5d5f95dcc65ab503d7d8b10.png" user="zxap044" version="1"
META FILEATTACHMENT	attachment="latex9d3f1a4c4afb18eb14f971599b2a4718.png" attr="h" comment="" date="1454078101" name="latex9d3f1a4c4afb18eb14f971599b2a4718.png" user="zxap044" version="1"
META FILEATTACHMENT	attachment="latex03ab0cf5f2986d2221977ac890e02ef0.png" attr="h" comment="" date="1454078101" name="latex03ab0cf5f2986d2221977ac890e02ef0.png" user="zxap044" version="1"

View topic | History: r1 | More topic actions...

Copyright © 2008-2022 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding RHUL Physics Department TWiki? Send feedback