Change BSI field ionization model

- `AlgorithmBSI.hpp`: use field from AU namespace
- `BSI.def`,
  `BSI_Impl`: changes in documentation

src/picongpu/include/particles/ionization/byField/BSI/AlgorithmBSI.hpp

@@ -1,5 +1,5 @@
 /**
- * Copyright 2014 Marco Garten
+ * Copyright 2014-2015 Marco Garten
  *
  * This file is part of PIConGPU.
  *
@@ -70,7 +70,7 @@ namespace ionization
             uint32_t cs = math::float2int_rd(chargeState);
 
             /* ionization condition */
-            if (math::abs(eField)*UNIT_EFIELD >= SI::IONIZATION_EFIELD[cs] && chargeState < protonNumber)
+            if (math::abs(eField) / ATOMIC_UNIT_EFIELD >= AU::IONIZATION_EFIELD_HYDROGEN[cs] && chargeState < protonNumber)
             {
                 /* set new particle charge state */
                 parentIon[boundElectrons_] -= float_X(1.0);

src/picongpu/include/particles/ionization/byField/BSI/BSI.def

@@ -42,13 +42,16 @@ namespace ionization
     struct BSI_Impl;
 
     /** \struct BSI
-     * 
+     *
      * \brief Barrier Suppression Ionization
      *
      * - takes the ionization energies of the various charge states of ions
-     * - calculates the corresponding field strengths necessary to overcome the binding energy of the electron to the core
+     * - calculates the corresponding field strengths necessary to overcome
+     *   the binding energy of the electron to the core
      * - if the field strength is locally exceeded: increase the charge state
-     * - see for example: Delone, N. B.; Krainov, V. P. (1998). "Tunneling and barrier-suppression ionization of atoms and ions in a laser radiation field"
+     * - see for example: Delone, N. B.; Krainov, V. P. (1998).
+     *   "Tunneling and barrier-suppression ionization of atoms and ions in a laser radiation field"
+     *   doi:10.1070/PU1998v041n05ABEH000393
      *
      * \tparam T_DestSpecies electron species to be created
      *

src/picongpu/include/particles/ionization/byField/BSI/BSI_Impl.hpp

@@ -46,6 +46,7 @@ namespace ionization
 {
 
     /** \struct BSI_Impl
+     * 
      * \brief Barrier Suppression Ionization - Implementation
      *
      * \tparam T_DestSpecies electron species to be created