### Rydberg equation

Posted:

**Wed Nov 06, 2019 9:31 pm**Why are we not allowed to use the Rydberg equation frequency = R( 1/n1^2 - 1/n2^2)?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=21&t=50671

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Posted: **Wed Nov 06, 2019 9:31 pm**

Why are we not allowed to use the Rydberg equation frequency = R( 1/n1^2 - 1/n2^2)?

Posted: **Wed Nov 06, 2019 9:40 pm**

I don't think it's that we're not allowed to. Just that Lavelle would prefer that we use -hR/n1^2.

Posted: **Wed Nov 06, 2019 11:26 pm**

Why is that preferred?

Posted: **Wed Nov 06, 2019 11:38 pm**

It's preferred because it is easier to understand conceptually with the way he taught us in class.

Posted: **Wed Nov 06, 2019 11:43 pm**

The Rydberg equation doesn't show different energy levels and how to conceptually get from one level to another one. Thus, it's easy to either get mixed up with emission vs absorption or to just completely forget to concepts behind the formula.

Posted: **Wed Nov 06, 2019 11:49 pm**

You can use that equation, but the energy version that's given by Dr. Lavelle explains the concept better for me.

Posted: **Wed Nov 06, 2019 11:54 pm**

The equation you stated is a derivation of -hr/nfinal^2 - (-hr/ninitial^2). If you factor out the -hr you should get an equation similar to what you posted. As the others stated the equation we learned in class is easier to see conceptually.

Posted: **Tue Nov 12, 2019 12:23 am**

We are actually totally allowed to use the Rydberg equation, whereas using the (final - initial) form of the the Rydberg equation could give us a better understanding of the concept and therefore what we are doing. And I believe that using the form of equation recommended by professor Lavelle eliminates the probability of confusing the final state with the initial state.

Posted: **Mon Dec 02, 2019 11:44 pm**

You're allowed to use both, yet it depends on which one explains the concept better for you.

Posted: **Mon Dec 02, 2019 11:46 pm**

I think we're not allowed to because it doesn't fully show out the concept. This class is very conceptual, therefore the whole concept of each problem is expected to be shown in our work.