# Calculation of scattering amplitude ratio for two different angles

1. Sep 30, 2008

### GAGS

Hi all, since scattering amplitude is given as:
f(theta) = summation over l(from o to infinity)(2l+1)/k exp(i(phi))sin(phi) Pl(cos theta).But what happen if i want to calculate the ratio of f(theta=0)/f(theta = pi/2).
Can any one tell me the value of Pl(0).
Thanks

2. Sep 30, 2008