added column width rad/T

added diffusion constants

isotables/isotopapp/views.py

@@ -280,3 +280,38 @@ def position(request):
                                              "div_table": div_table})
 
 
+def diff(c1, c2, temp_Kelvin):
+    return 1e-9*np.exp(c1+c2*1000/temp_Kelvin)
+
+def diffusion(request):
+    standard = request.GET.get("standard")
+    temperature = float(request.GET.get("temperature"))
+    if standard == "h2o":
+        diffusion_constant = 1.635e-8*(temperature/215.05-1)**2.063
+        standard_name = "H<sub>2</sub>O"
+    elif standard == "tetradecane":
+        diffusion_constant = diff(5.6286, -1.8726, temperature)
+        standard_name = "Tetradecane"
+    elif standard == "cyclohexane":
+        diffusion_constant = diff(5.8765, -1.6477, temperature)
+        standard_name = "Cyclohexane"
+    elif standard == "dioxane":
+        diffusion_constant = diff(5.7064, -1.6754, temperature)
+        standard_name = "Dioxane"
+    elif standard == "dodecane":
+        diffusion_constant = diff(5.3193 , -1.6483, temperature)
+        standard_name = "Dodecane"
+    elif standard == "dmso":
+        diffusion_constant = diff(5.6991 , -1.7927, temperature)
+        standard_name = "DMSO"
+    elif standard == "pentanol":
+        diffusion_constant = diff(8.4847, -2.9018, temperature)
+        standard_name = "Pentanol"
+
+
+
+
+    return render(request, 'diffusion.html', {'standard_name': standard_name,
+                                              'temperature_kelvin': temperature,
+                                              'temperature_celsius': temperature-273.15,
+                                              'diffusion_constant': diffusion_constant})