Chemical Forums
Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: mrdoovde1 on August 19, 2014, 02:06:51 PM
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In an absorption spectrum, the following wavenumbers were measured for the vibronic transitions of a diatomic molecule. Determine the harmonic frequency and the anharmonicity constant (assume that all transitions start from the v" = 0 level of the ground state).
V' Wavenumber/cm-1
0 35217
1 35633
2 36025
3 36025
Can someone tell me the formula I use and how to calculate this please
Thanks
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You're going to have to show us some attempts at this question yourself first - let's start with the formula, how can we describe the system here?
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You're going to have to show us some attempts at this question yourself first - let's start with the formula, how can we describe the system here?
That's what I don't get. I don't know what formula to use.
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OK, we'll start with the simplest model of a vibration - a harmonic oscillator (in this question we'll have to consider deviation from that model - hence you're being asked for an anharmonicity constant, but harmonic oscillator is a good starting point). I take you must have been taught about the quantum harmonic oscillator and its solutions - what's the formula for the energy level?
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OK, we'll start with the simplest model of a vibration - a harmonic oscillator (in this question we'll have to consider deviation from that model - hence you're being asked for an anharmonicity constant, but harmonic oscillator is a good starting point). I take you must have been taught about the quantum harmonic oscillator and its solutions - what's the formula for the energy level?
We haven't covered too much on it. This question was from a past exam paper I using for revision.
For your question I'm assuming it's: w x h-bar x (n + 1/2) ?