diff --git a/runs/Argon_Expansion/CX_case.json b/runs/Argon_Expansion/CX_case.json
index 8081b94..ff4bdbf 100644
--- a/runs/Argon_Expansion/CX_case.json
+++ b/runs/Argon_Expansion/CX_case.json
@@ -1,7 +1,7 @@
 {
   "output": {
     "path": "./runs/Argon_Expansion/",
-	"triggerOutput": 10,
+	"triggerOutput": 100,
 	"cpuTime": false,
 	"numColl": true,
 	"folder": "CX_case"
@@ -9,32 +9,29 @@
   "geometry": {
     "dimension": 2,
     "type":     "Cyl",
-    "meshType": "gmsh2",
-    "meshFile": "mesh.msh"
+    "meshType": "vtu",
+    "meshFile": "mesh.vtu"
   },
   "species": [
-    {"name": "Argon",  "type": "neutral", "mass": 6.633e-26, "weight": 1.0e8, "ion": "Argon+"},
+    {"name": "Argon",  "type": "neutral", "mass": 6.633e-26, "weight": 1.0e8,                "ion": "Argon+"},
     {"name": "Argon+", "type": "charged", "mass": 6.633e-26, "weight": 1.0e8, "charge": 1.0, "neutral": "Argon"}
   ],
-  "boundary": [ 
-    {"name": "Injection", "physicalSurface": 1, "bTypes": [
-                                                  {"type": "transparent"},
-                                                  {"type": "transparent"}
-                                                 ]},
-    {"name": "Exterior",  "physicalSurface": 2, "bTypes": [
-                                                  {"type": "transparent"},
-                                                  {"type": "transparent"}
-                                                 ]},
-    {"name": "Axis",      "physicalSurface": 3, "bTypes": [
-                                                  {"type": "axis"},
-                                                  {"type": "axis"}
-                                                 ]}
+  "boundaries": { 
+    "particles": [
+      {"name": "Transparent", "type": "transparent"},
+      {"name": "Axis",        "type": "axis"}
+    ]
+  },
+  "physicalSurfaces": [
+    {"index": 1, "particles":["Axis",        "Axis"]},
+    {"index": 2, "particles":["Transparent", "Transparent"]},
+    {"index": 3, "particles":["Transparent", "Transparent"]}
   ],
   "inject": [
     {"name": "Exhausts Ar", "species": "Argon", "flow": 0.7, "units": "sccm",     "v": 300.0, "T": [300.0, 300.0, 300.0],
-                            "velDist": ["Maxwellian", "Maxwellian", "Maxwellian"], "n": [1, 0, 0], "physicalSurface": 1},
+                            "velDist": ["Maxwellian", "Maxwellian", "Maxwellian"], "n": [1, 0, 0], "physicalSurface": 3},
     {"name": "Exhausts Ar+", "species": "Argon+", "flow": 0.3, "units": "sccm",     "v": 40000.0, "T": [300.0, 300.0, 300.0],
-                             "velDist": ["Maxwellian", "Maxwellian", "Maxwellian"], "n": [1, 0, 0], "physicalSurface": 1}
+                             "velDist": ["Maxwellian", "Maxwellian", "Maxwellian"], "n": [1, 0, 0], "physicalSurface": 3}
   ],
   "reference": {
     "density": 1.0e19,
@@ -43,13 +40,14 @@
     "radius": 1.88e-10
   },
   "solver": {
-    "tau":  [1.0e-6, 1.0e-6],
-    "finalTime": 4.0e-3,
+    "tau":  [1.0e-7, 1.0e-7],
+    "finalTime": 1.0e-3,
     "pusher": ["Neutral", "Neutral"],
     "WeightingScheme": "Volume"
   },
   "interactions": {
     "folderCollisions": "./data/collisions/",
+    "timeStep": 1.0e-5,
     "collisions": [
       {"species_i": "Argon", "species_j": "Argon", 
        "cTypes": [
diff --git a/runs/Argon_Expansion/README.txt b/runs/Argon_Expansion/README.txt
new file mode 100644
index 0000000..b0cc716
--- /dev/null
+++ b/runs/Argon_Expansion/README.txt
@@ -0,0 +1,3 @@
+Case to study the expansion of Ar plasma. Three input files: Without collisions, with elastic collisions, and with charge exchange collisions.
+
+It can be seen that for the charge-exchange case, neutrals of high velocity appear as these are previous ions of high velocity (40 km s^-1).
diff --git a/runs/Argon_Expansion/elastic_case.json b/runs/Argon_Expansion/elastic_case.json
index dab4720..61e280a 100644
--- a/runs/Argon_Expansion/elastic_case.json
+++ b/runs/Argon_Expansion/elastic_case.json
@@ -1,40 +1,37 @@
 {
   "output": {
     "path": "./runs/Argon_Expansion/",
-	"triggerOutput": 10,
+	"triggerOutput": 100,
 	"cpuTime": false,
-	"numColl": false,
+	"numColl": true,
 	"folder": "Elastic_case"
   },
   "geometry": {
     "dimension": 2,
     "type":     "Cyl",
-    "meshType": "gmsh2",
-    "meshFile": "mesh.msh"
+    "meshType": "vtu",
+    "meshFile": "mesh.vtu"
   },
   "species": [
     {"name": "Argon",  "type": "neutral", "mass": 6.633e-26, "weight": 1.0e8,                "ion": "Argon+"},
     {"name": "Argon+", "type": "charged", "mass": 6.633e-26, "weight": 1.0e8, "charge": 1.0, "neutral": "Argon"}
   ],
-  "boundary": [ 
-    {"name": "Injection", "physicalSurface": 1, "bTypes": [
-                                                  {"type": "transparent"},
-                                                  {"type": "transparent"}
-                                                 ]},
-    {"name": "Exterior",  "physicalSurface": 2, "bTypes": [
-                                                  {"type": "transparent"},
-                                                  {"type": "transparent"}
-                                                 ]},
-    {"name": "Axis",      "physicalSurface": 3, "bTypes": [
-                                                  {"type": "axis"},
-                                                  {"type": "axis"}
-                                                 ]}
+  "boundaries": { 
+    "particles": [
+      {"name": "Transparent", "type": "transparent"},
+      {"name": "Axis",        "type": "axis"}
+    ]
+  },
+  "physicalSurfaces": [
+    {"index": 1, "particles":["Axis",        "Axis"]},
+    {"index": 2, "particles":["Transparent", "Transparent"]},
+    {"index": 3, "particles":["Transparent", "Transparent"]}
   ],
   "inject": [
     {"name": "Exhausts Ar", "species": "Argon", "flow": 0.7, "units": "sccm",     "v": 300.0, "T": [300.0, 300.0, 300.0],
-                            "velDist": ["Maxwellian", "Maxwellian", "Maxwellian"], "n": [1, 0, 0], "physicalSurface": 1},
+                            "velDist": ["Maxwellian", "Maxwellian", "Maxwellian"], "n": [1, 0, 0], "physicalSurface": 3},
     {"name": "Exhausts Ar+", "species": "Argon+", "flow": 0.3, "units": "sccm",     "v": 40000.0, "T": [300.0, 300.0, 300.0],
-                             "velDist": ["Maxwellian", "Maxwellian", "Maxwellian"], "n": [1, 0, 0], "physicalSurface": 1}
+                             "velDist": ["Maxwellian", "Maxwellian", "Maxwellian"], "n": [1, 0, 0], "physicalSurface": 3}
   ],
   "reference": {
     "density": 1.0e19,
@@ -43,13 +40,14 @@
     "radius": 1.88e-10
   },
   "solver": {
-    "tau":  [1.0e-6, 1.0e-6],
-    "finalTime": 4.0e-3,
+    "tau":  [1.0e-7, 1.0e-7],
+    "finalTime": 1.0e-3,
     "pusher": ["Neutral", "Neutral"],
     "WeightingScheme": "Volume"
   },
   "interactions": {
     "folderCollisions": "./data/collisions/",
+    "timeStep": 1.0e-5,
     "collisions": [
       {"species_i": "Argon", "species_j": "Argon", 
        "cTypes": [
@@ -63,7 +61,7 @@
   },
   "parallel": {
     "OpenMP":{
-      "nThreads": 8
+      "nThreads": 24
     }
   }
 }
diff --git a/runs/Argon_Expansion/mesh.msh b/runs/Argon_Expansion/mesh.msh
deleted file mode 100644
index d1b018c..0000000
--- a/runs/Argon_Expansion/mesh.msh
+++ /dev/null
@@ -1,1010 +0,0 @@
-$MeshFormat
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diff --git a/runs/Argon_Expansion/mesh.vtu b/runs/Argon_Expansion/mesh.vtu
new file mode 100644
index 0000000..6038e80
--- /dev/null
+++ b/runs/Argon_Expansion/mesh.vtu
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+  </UnstructuredGrid>
+</VTKFile>
diff --git a/runs/Argon_Expansion/nocoll_case.json b/runs/Argon_Expansion/nocoll_case.json
index 094fb80..e84ab66 100644
--- a/runs/Argon_Expansion/nocoll_case.json
+++ b/runs/Argon_Expansion/nocoll_case.json
@@ -1,7 +1,7 @@
 {
   "output": {
     "path": "./runs/Argon_Expansion/",
-	"triggerOutput": 10,
+	"triggerOutput": 100,
 	"cpuTime": false,
 	"numColl": false,
 	"folder": "Nocoll_case"
@@ -9,32 +9,29 @@
   "geometry": {
     "dimension": 2,
     "type":     "Cyl",
-    "meshType": "gmsh2",
-    "meshFile": "mesh.msh"
+    "meshType": "vtu",
+    "meshFile": "mesh.vtu"
   },
   "species": [
     {"name": "Argon",  "type": "neutral", "mass": 6.633e-26, "weight": 1.0e8,                "ion": "Argon+"},
     {"name": "Argon+", "type": "charged", "mass": 6.633e-26, "weight": 1.0e8, "charge": 1.0, "neutral": "Argon"}
   ],
-  "boundary": [ 
-    {"name": "Injection", "physicalSurface": 1, "bTypes": [
-                                                  {"type": "transparent"},
-                                                  {"type": "transparent"}
-                                                 ]},
-    {"name": "Exterior",  "physicalSurface": 2, "bTypes": [
-                                                  {"type": "transparent"},
-                                                  {"type": "transparent"}
-                                                 ]},
-    {"name": "Axis",      "physicalSurface": 3, "bTypes": [
-                                                  {"type": "axis"},
-                                                  {"type": "axis"}
-                                                 ]}
+  "boundaries": { 
+    "particles": [
+      {"name": "Transparent", "type": "transparent"},
+      {"name": "Axis",        "type": "axis"}
+    ]
+  },
+  "physicalSurfaces": [
+    {"index": 1, "particles":["Axis",        "Axis"]},
+    {"index": 2, "particles":["Transparent", "Transparent"]},
+    {"index": 3, "particles":["Transparent", "Transparent"]}
   ],
   "inject": [
     {"name": "Exhausts Ar", "species": "Argon", "flow": 0.7, "units": "sccm",     "v": 300.0, "T": [300.0, 300.0, 300.0],
-                            "velDist": ["Maxwellian", "Maxwellian", "Maxwellian"], "n": [1, 0, 0], "physicalSurface": 1},
+                            "velDist": ["Maxwellian", "Maxwellian", "Maxwellian"], "n": [1, 0, 0], "physicalSurface": 3},
     {"name": "Exhausts Ar+", "species": "Argon+", "flow": 0.3, "units": "sccm",     "v": 40000.0, "T": [300.0, 300.0, 300.0],
-                             "velDist": ["Maxwellian", "Maxwellian", "Maxwellian"], "n": [1, 0, 0], "physicalSurface": 1}
+                             "velDist": ["Maxwellian", "Maxwellian", "Maxwellian"], "n": [1, 0, 0], "physicalSurface": 3}
   ],
   "reference": {
     "density": 1.0e19,
@@ -43,8 +40,8 @@
     "radius": 1.88e-10
   },
   "solver": {
-    "tau":  [1.0e-6, 1.0e-6],
-    "finalTime": 4.0e-3,
+    "tau":  [1.0e-7, 1.0e-7],
+    "finalTime": 1.0e-3,
     "pusher": ["Neutral", "Neutral"],
     "WeightingScheme": "Volume"
   },