This example using the electron Force Field (eFF) was created by Andres Jaramillo-Botero and distributed with LAMMPS in the "examples/USER/eff/CH4" subdirectory. A paper describing the EFF method can be found here.
(The files from that example were converted into moltemplate format using "ltemplify.py" and then edited by hand (to rename the atom types, and replace all of the "pair_coeff ..." commands with "pair_coeff * *")
The original README file distributed with that example is very short:
"Methane, valence electron ionization and full molecule tests (spe, dynamics). Note: electron mass set to 1"
Regarding the "run.in.ch4_ionized" file As of 2014-3-12, the "pair_style eff/cut 5000.0 0 0" command located in "orig_files/in.ch4_ionized.dynamics" (as well as the files "moltemplate_files/ch4_ionized.lt" and "system.in.settings", which are both derived from it) causes LAMMPS to hang. Running LAMMPS on Andres' original eFF example has the same behavior. This appears to be an eFF/LAMMPS issue (not a moltemplate issue). The "pair_style eff/cut 100" command works, so try reducing the cutoff (or ask Andres Jaramillo-Botero for help). Please let me know if you solve this issue (jewett.aij -at- g mail)