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In molecular [[spectroscopy]], the '''Birge–Sponer method''' or '''Birge–Sponer plot''' is a way to calculate the [[dissociation energy]] of a molecule. By observing transitions between as many [[Molecular vibration|vibrational energy levels]] as possible, for example through electronic or [[infrared spectroscopy]], the difference between the energy levels, <math>\Delta G_{v+\frac{1}{2}}=G(v+1)-G(v)</math> can be calculated. This sum will have a [[maximum]] at <math>v_{max}</math>, representing the point of bond dissociation; summing over all the differences up to this point gives the total energy required to dissociate the molecule, i.e. to promote it from the [[ground state]] to an unbound state. This can be written:


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<math>D_0=\sum_{v=0}^{v_{max}} \Delta G_{v+\frac{1}{2}}</math>


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where <math>D_0</math> is the dissociation energy. If a [[Morse potential]] is assumed, plotting <math>\Delta G_{v+\frac{1}{2}}</math> against <math>v+1/2</math> should give a straight line, from which it is easy to extract <math>v_{max}</math> from the [[Zero of a function|intercept]] with the x-axis. In practice, such plots often give curves because of unaccounted anharmonicity in the potential; furthermore, the low population of the higher states (or the [[Franck-Condon principle]]) makes it difficult to experimentally obtain data at high values of <math>v</math>. Thus the [[extrapolation]] can be inaccurate and only an upper limit for the value of the dissociation energy can be obtained.
 
This method takes its name from [[Raymond Thayer Birge]] and [[Hertha Sponer]], the two physical chemists that developed it.
 
== References ==
*{{cite book |title= Basic Atomic and Molecular Spectroscopy|last= Hollas |first=Michael |year=2002 |publisher= [[Royal Society of Chemistry]]|isbn= 9780854046676|page= 81}}
*{{cite book|title=Vibrational Spectroscopy: Theory and Applications|last=Sathyanarayana|first=D.N.|year=2007|publisher=New Age International|isbn=9788122415179|page=18}}
 
{{DEFAULTSORT:Birge-Sponer method}}
[[Category:Spectroscopy]]

Revision as of 19:13, 31 January 2014

In molecular spectroscopy, the Birge–Sponer method or Birge–Sponer plot is a way to calculate the dissociation energy of a molecule. By observing transitions between as many vibrational energy levels as possible, for example through electronic or infrared spectroscopy, the difference between the energy levels, can be calculated. This sum will have a maximum at , representing the point of bond dissociation; summing over all the differences up to this point gives the total energy required to dissociate the molecule, i.e. to promote it from the ground state to an unbound state. This can be written:

where is the dissociation energy. If a Morse potential is assumed, plotting against should give a straight line, from which it is easy to extract from the intercept with the x-axis. In practice, such plots often give curves because of unaccounted anharmonicity in the potential; furthermore, the low population of the higher states (or the Franck-Condon principle) makes it difficult to experimentally obtain data at high values of . Thus the extrapolation can be inaccurate and only an upper limit for the value of the dissociation energy can be obtained.

This method takes its name from Raymond Thayer Birge and Hertha Sponer, the two physical chemists that developed it.

References

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