From fe27e437252aed66b5b45cddbd18a6b70967ae0a Mon Sep 17 00:00:00 2001
From: ChristopherMayes <31023527+ChristopherMayes@users.noreply.github.com>
Date: Wed, 27 Feb 2019 10:51:26 -0800
Subject: [PATCH] Added external fields

---
 EXT_BeamPhysics.md | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/EXT_BeamPhysics.md b/EXT_BeamPhysics.md
index d063c9b..ea6e954 100644
--- a/EXT_BeamPhysics.md
+++ b/EXT_BeamPhysics.md
@@ -103,11 +103,19 @@ The following records store data on a particle-by-particle basis.
   - Description: The charge state of the particles. Used for atoms and molecules. Not needed if the charge can be computed from knowledge of the `SpeciesType` (That is, a fundamental particle). Also see `weighting`.
 
 - `electricField/`
-    - Type: Optional 2-component *(float)*
-    - Description: Electric field. Used for photons only.
-    - Components: (`x`, `y`).
-        - For each component, the field is specified using either (`amplitude`, `phase`) or (`Real`, `Imaginary`)
-        subcomponents.
+    - Type: Optional 3-vector *(float)*
+    - Description: External electric field at the particle. 
+    - Components: (`x`, `y`, `z`).
+
+- `magneticField/`
+    - Type: Optional 3-vector *(float)*
+    - Description: External magnetic field at the particle. 
+    - Components: (`x`, `y`, `z`).
+
+- `photonPolarization/`
+    - Type: Optional 2-vector *(complex)*
+    - Description: Polarization of the photon
+    - Components: (`x`, `y`), transverse to the direction of the photon.
 
 - `momentum/`
   - Type: Optional 3-vector *(float)*