The Origin Forum - arrhenius fit in origin for tpds!

The Origin Forum

Username:	Password:
Save Password
Forgot your Password? \| Admin Options

All Forums

Origin Forum

arrhenius fit in origin for tpds!

New Topic

Reply to Topic

Printer Friendly

Author

Topic

storni

France
2 Posts

Posted - 02/10/2012 : 04:26:26 AM

hi everyone!

i study desorption from surfaces and I've been trying to fit the desorption curve with origin but im not sure where to start..

the desorption curve is given by arrhenius equation

-dq/dt = - B dq/dT = A q^n exp(-E /RT), n = 0, 1 or 2

and my desorption curves (tpd) look like this:

http://www.azonano.com/work/dGsX0HlSy259g2RTE3U9_files/image004.gif

how can i start to fit any of these curves?

any help would be greatly appreciated!

~storni

storni

France
2 Posts

Posted - 02/10/2012 : 06:00:06 AM

I think actually I could try fitting these curves with a Maxwell Boltzmann distribution since they look a lot like:
http://www.chemistry.wustl.edu/~edudev/LabTutorials/Airbags/images/maxwell.jpg
In origin, I only find "Boltzmann" as a possibility of fit but I'm not sure how to initalize the parameters.

quote:
Originally posted by storni

hi everyone!

i study desorption from surfaces and I've been trying to fit the desorption curve with origin but im not sure where to start..

the desorption curve is given by arrhenius equation

-dq/dt = - B dq/dT = A q^n exp(-E /RT), n = 0, 1 or 2

and my desorption curves (tpd) look like this:

http://www.azonano.com/work/dGsX0HlSy259g2RTE3U9_files/image004.gif

how can i start to fit any of these curves?

any help would be greatly appreciated!

~storni

Topic

New Topic

Reply to Topic

Printer Friendly

Jump To:

The Origin Forum

Snitz Forums 2000