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Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: Eddzzz_2012 on February 20, 2013, 04:54:53 PM

Title: Rotational bond constant. - molecular spec
Post by: Eddzzz_2012 on February 20, 2013, 04:54:53 PM

Hey. I have two values of B - B0 = 4, B1 = 3. I need to comment on whether the bond length will be longer in the v=0 or the v=1 state. So:

B0 > B1,
B1 has higher moment of inertia,
therefore B1 it will have a longer bond length.

The question says explain physical properties. Is this right? Not sure where to mention v=0 or v=1 either.

Title: Re: Rotational bond constant. - molecular spec
Post by: Schrödinger on February 21, 2013, 03:13:01 AM

Seems fine. v=0 state corresponds to B₀ and v=1 corresponds to the B₁. Hence the state with the lower B value has higher I and consequently greater bond length.

Title: Re: Rotational bond constant. - molecular spec
Post by: Eddzzz_2012 on February 21, 2013, 06:37:58 AM

Thanks a lot :)