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Topic: Determining the frequencies of a triatomic molecule  (Read 6115 times)

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Offline supermonkey

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Determining the frequencies of a triatomic molecule
« on: December 05, 2008, 08:53:44 PM »
with the given two steching modes force constants...the molecule is N-N-O+ I know if it was diatomic I would use hookes law but I'm not sure what equation to use for triatomic
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Offline FeLiXe

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Re: Determining the frequencies of a triatomic molecule
« Reply #1 on: December 06, 2008, 10:43:54 AM »
it's the same idea. just with reduced mass instead of mass. you are talking about the force constants of the modes and not just of the two bonds, right?
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Offline supermonkey

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Re: Determining the frequencies of a triatomic molecule
« Reply #2 on: December 06, 2008, 03:42:42 PM »
the force constants given were for kNN and kNO
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Offline FeLiXe

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Re: Determining the frequencies of a triatomic molecule
« Reply #3 on: December 07, 2008, 06:03:39 AM »
did you look at this: http://farside.ph.utexas.edu/teaching/336k/lectures/node115.html
it seems that you could do it in a similar way for NNO
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Offline supermonkey

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Re: Determining the frequencies of a triatomic molecule
« Reply #4 on: December 08, 2008, 09:18:15 AM »
thanks that site was veryful...I was thinking that the middle N was stationary too but I didn't know if it was how to solve it but this site showed me
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