All Forums  Origin Forum  Origin Forum  Problem with Voigt fit - huge uncertainty for xc

Note: You must be registered in order to post a reply.
To register, click here. Registration is FREE!

Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by dfink[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): 9.00 Operating System: Win7 Dear All, I have a question regarding the Voigt fit. I would like to fit the Voigt function to a spectrum of peaks, which clearly have a Voigt profile. When fitting with Voigt, it usually looks nice and Xi2 is ok, but unfortunately, the uncertainty for the centroid is huge for unknown reason. I don't have this problem, when I am using the Lorentz-function or Gaussians separately. Uncertainties are small as they should. However, I really would like to use Voigt instead. Is this just normal for fits with Voigt functions, is there a standard procedure (fix parameters, playing with widths etc.) or is this a bug? It would be great, if someone could help me. Thanks a lot. Best regards, Daniel [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.