Polarized EXAFS

[Matt Newville <newville@cars.uchicago.edu>]

Dear Feff,

I'm not sure whether this is a 'user' or 'developer' question,
but I'd like to extract the EXAFS (yes, E-XAFS) contribution
from the different orbitals for L_III edges, especially for
studying the polarization dependence of L-edges.  I see
calculated polarization dependencies that I don't fully
understand, and want to be able to isolate the different terms.
How can I do this?  Ideally, I'd like to be able to make
separate feff.dat files for l->l+1, l->l-1, cross terms, and
quadrapole contributions.  I don't see anything about this in
the docs, but a recent mail from Alex:

> 3) New extension to the MULTIPOLE card, in response to a suggestion
>    from Michel Jaouen
>     MULTIPOLE  le2 [l2lp]
>      default: le2=0 (dipole only) and l2lp=0 (both l-->lp = l+/-1 channels)
>      le2 = 2  adds quadrupole transitions (works only with l2lp=0)
>      l2lp  = +1 include only dipole l-->l+1 transitions
>      l2lp  = -1 include only dipole l-->l-1 transitions

Hinted that it might be possible.  Unfortunately, this is a bit
cryptic for me.  I think I might want each of
  MULTIPOLE  0  1
  MULTIPOLE  0 -1
  MULTIPOLE  2  0

which, should all add together to give
  MULTIPOLE  0  0

But, then again, I'm not sure:   Aren't there cross terms?

Any suggestions?  Thanks,

--Matt Newville