# PLASMON

### From FEFF

*Advanced*

PLASMON ipl

This card runs feff with the multiple-pole self energy.

The values of the argument ipl correspond to the following: 0: run regular FEFF but print out the self energy; 1: run multiple pole self energy without renormalization; 2: run multiple pole self energy with renormalization.

It takes as input `exc.dat' which can be formed in the following way:

- Calculate or measure the energy loss spectrum epsilon-inverse
- Use the formula detailed in `EpsInvFormula.ps' to calculate omega
_{i}and f_{i}. Now write three columns in `exc.dat', omega_{i},

gamma_{i}, and f_{i}. gamma_{i} is irrelevant at this time. Units should be eV.

The output file `sigma.dat' contains the self energy and the renormalization constant (at the interstitial radius) as a function of photoelectron energy in eV.

* make regular FEFF calculations, print out multiple-pole self-energy PLASMON 0