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-   -   Aproximating a morse potential using a taylor polynomial (http://www.physicsforums.com/showthread.php?t=652074)

physicsman314 Nov13-12 11:05 PM

Aproximating a morse potential using a taylor polynomial
 
I am not going to post my question because I want to find out how to actually use the taylor polynomial and morse potential and then apply that to my problem. Say I have to approximate the morse potential using a taylor series expanding about some value. This will then find me the force constant. How would I go about setting up such equations?

Jorriss Nov13-12 11:09 PM

Re: Aproximating a morse potential using a taylor polynomial
 
Quote:

Quote by physicsman314 (Post 4158466)
I am not going to post my question because I want to find out how to actually use the taylor polynomial and morse potential and then apply that to my problem. Say I have to approximate the morse potential using a taylor series expanding about some value. This will then find me the force constant. How would I go about setting up such equations?

Do you know how to taylor expand exponentials?

physicsman314 Nov13-12 11:18 PM

Re: Aproximating a morse potential using a taylor polynomial
 
Quote:

Quote by Jorriss (Post 4158471)
Do you know how to taylor expand exponentials?

yeah, i know the formula
f(x) = f(a) + f'(a)(x-a) + f''(a)/2! (x-a)^2 and so on
I'm not sure how to do this on a morse potential. Seems like there are a lot of variables and I'm not sure from my given data, what goes where.

Jorriss Nov14-12 10:10 PM

Re: Aproximating a morse potential using a taylor polynomial
 
Quote:

Quote by physicsman314 (Post 4158477)
yeah, i know the formula
f(x) = f(a) + f'(a)(x-a) + f''(a)/2! (x-a)^2 and so on
I'm not sure how to do this on a morse potential. Seems like there are a lot of variables and I'm not sure from my given data, what goes where.

There are not more variables exactly, there are more parameters but the only independent variable is r. So try expanding in terms of r and treat everything else as a constant.


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