[CHM 331] Birge-Spooner Plots

[Andrew J. Pounds]

That is correct IF you knew all of the energies up to the dissociation 
limit (look carefully at that equation).   We do not have all those.   
Typically the results in these experiments are for results down in the 
well and the extrapolation to the X-Axis is how we approximate the 
dissociation limit.

Once you graph them and do the extrapolation this will be obvious.  
Iodine has something like 120 vibrational states.  You don't have nearly 
that much data.


On 04/23/2017 05:09 PM, Kathryn Elizabeth Morris wrote:
> The book told me that I can calculate all the dissociation energy by 
> the sum of the change in G values before n is zero/negative. Is this 
> correct also?
> ------------------------------------------------------------------------
> *From:* chm331-bounces at theochem.mercer.edu 
> <chm331-bounces at theochem.mercer.edu> on behalf of Andrew J. Pounds 
> <pounds_aj at mercer.edu>
> *Sent:* Sunday, April 23, 2017 4:17:57 PM
> *To:* chm331 at theochem.mercer.edu
> *Subject:* [CHM 331] Birge-Spooner Plots
>
> Students, please make sure that when you create your Birge-Spooner 
> plots (problems 25.6 and 25.7) that you extend your best fit lines all 
> the way down to the X-Axis.   Once you know the crossing point on the 
> X-Axis (which is the highest vibrational state for the well) you can 
> then simply calculate the dissociation energy by determining the area 
> under the curve.   This is simply a right triangle -- so 
> $A=\frac{1}{2}b h$ where $b$ abd $h$ refer to the base and the height 
> of the triangle.
>
>
> -- 
> Andrew J. Pounds, Ph.D.  (pounds_aj at mercer.edu)
> Professor of Chemistry and Computer Science
> Mercer University,  Macon, GA 31207   (478) 301-5627
> http://faculty.mercer.edu/pounds_aj


-- 
Andrew J. Pounds, Ph.D.  (pounds_aj at mercer.edu)
Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627
http://faculty.mercer.edu/pounds_aj

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