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Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: camariela on April 30, 2006, 03:31:38 PM

Title: Determining bond lengths from rotational constant
Post by: camariela on April 30, 2006, 03:31:38 PM

Hello,
The question that I would appreciate aid on would be:

The rotational constant B for CO2 was found from rotational Raman spectra to be B = 0.3937/cm. Determine the C=O bond length from this value.

Thanks!
camariela

Title: Re: Determining bond lengths from rotational constant
Post by: Donaldson Tan on April 30, 2006, 04:29:28 PM

Use the rigid rotor model to solve

Title: Re: Determining bond lengths from rotational constant
Post by: camariela on May 02, 2006, 09:11:38 PM

Do work out the moment of inertia from that and then work out the bond length?
How would I work out the bond length from the moment of inertia of CO2?

Title: Re: Determining bond lengths from rotational constant
Post by: Donaldson Tan on May 02, 2006, 10:13:42 PM

B = h/8.Pi².c.I

I = m_effectiveR²