How Should I Calculate Rotational Energy Levels of NH3?

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Homework Help Overview

The original poster attempts to calculate the rotational energy levels of NH3, identifying it as a symmetric rotator. They reference a specific equation for determining these energy levels and express uncertainty about the number of levels that should be calculated.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Some participants discuss the concept of infinite energy levels due to the lack of an upper limit on J, comparing it to electron energy levels in atoms. The original poster questions whether to calculate all levels or just a few.

Discussion Status

There is an ongoing exploration of the implications of calculating rotational energy levels, with some participants providing insights into the nature of these levels. The original poster indicates they have resolved their issue but acknowledges the potential for future questions.

Contextual Notes

The original poster expresses concern about imposing on others' time, indicating a desire to clarify their need for assistance. There is a suggestion of a review process in the discussion, reflecting the collaborative nature of the forum.

_Andreas
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I'm supposed to calculate the rotational energy levels of NH3, which is a symmetric rotator. The rotational energy levels are determined by the equation

EJK = hcBJ(J+1) + hc(A-B)K^2, where J = 0, 1, 2,..., and K = 0, +/-1, +/-2,..., +/-J

I don't quite get it. Are there a very limited set of rotational energy levels for NH3 that makes it practically possible for me to calculate each one of them, or should I calculate only the, say, first four possible levels? I've looked around for clues in my textbook, but I can't see that there are any.
 
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With no upper limit on J there are infinitely many energy levels. This is similar to the energy levels of electrons in an atiom. Start at the bottom and work your way up.
 
I had already solved it myself before you responded, but thanks anyway! I'll probably need more help in the future.
 
Oh, I guess I should make it clear if I no longer need help with a problem I've asked for help solving. It's certainly not OK for me to waste your time. My apologies!
 
_Andreas said:
Oh, I guess I should make it clear if I no longer need help with a problem I've asked for help solving. It's certainly not OK for me to waste your time. My apologies!
It would be good of you to do that. Not a problem here since I did not do much work and needed a bit of review anyway.
 

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