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<div class="moz-cite-prefix">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. <br>
<br>
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.<br>
<br>
<br>
On 04/23/2017 05:09 PM, Kathryn Elizabeth Morris wrote:<br>
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cite="mid:b45bf1e5f5df44b48390e1f75a20ad35@spiderman.MercerU.local"
type="cite">
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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?</div>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
face="Calibri, sans-serif" color="#000000"><b>From:</b>
<a class="moz-txt-link-abbreviated" href="mailto:chm331-bounces@theochem.mercer.edu">chm331-bounces@theochem.mercer.edu</a>
<a class="moz-txt-link-rfc2396E" href="mailto:chm331-bounces@theochem.mercer.edu"><chm331-bounces@theochem.mercer.edu></a> on behalf of Andrew
J. Pounds <a class="moz-txt-link-rfc2396E" href="mailto:pounds_aj@mercer.edu"><pounds_aj@mercer.edu></a><br>
<b>Sent:</b> Sunday, April 23, 2017 4:17:57 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:chm331@theochem.mercer.edu">chm331@theochem.mercer.edu</a><br>
<b>Subject:</b> [CHM 331] Birge-Spooner Plots</font>
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<p><font face="serif">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
<img style="vertical-align: middle" alt="$A=\frac{1}{2}b h$"
src="cid:part1.D4A60105.1ED87689@mercer.edu"> where
<img style="vertical-align: middle" alt="$b$"
src="cid:part2.62DCC48A.C7DB4678@mercer.edu"> abd
<img style="vertical-align: middle" alt="$h$"
src="cid:part3.26863190.C196DD46@mercer.edu"> refer to the
base and the height of the triangle.<br>
</font></p>
<p><br>
</p>
<pre class="moz-signature" cols="72">--
Andrew J. Pounds, Ph.D. (<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:pounds_aj@mercer.edu">pounds_aj@mercer.edu</a>)
Professor of Chemistry and Computer Science
Mercer University, Macon, GA 31207 (478) 301-5627
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://faculty.mercer.edu/pounds_aj">http://faculty.mercer.edu/pounds_aj</a>
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<pre class="moz-signature" cols="72">--
Andrew J. Pounds, Ph.D. (<a class="moz-txt-link-abbreviated" href="mailto:pounds_aj@mercer.edu">pounds_aj@mercer.edu</a>)
Professor of Chemistry and Computer Science
Mercer University, Macon, GA 31207 (478) 301-5627
<a class="moz-txt-link-freetext" href="http://faculty.mercer.edu/pounds_aj">http://faculty.mercer.edu/pounds_aj</a>
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