1 files changed, 111 insertions, 0 deletions
diff --git a/Elements_of_Physical_Chemistry/Chapter18.ipynb b/Elements_of_Physical_Chemistry/Chapter18.ipynb
new file mode 100755
index 00000000..36e81ed5
--- /dev/null
+++ b/Elements_of_Physical_Chemistry/Chapter18.ipynb
@@ -0,0 +1,111 @@
+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 18 - Electronic Transitions"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example E1 - Pg 441"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Calculate the transmittance\n",
+      "#Initialization of variables\n",
+      "import math\n",
+      "wl=256*math.pow(10,-9) #m\n",
+      "t=1 #mm\n",
+      "C=0.050 #mol/L\n",
+      "T=0.16\n",
+      "t2=2 #mm\n",
+      "#calculations\n",
+      "E=-math.log10(T) /(C*t)\n",
+      "A1=-math.log10(T)\n",
+      "A2=E*C*t2\n",
+      "Tr=math.pow(10,(-A2))\n",
+      "#results\n",
+      "print '%s %.3f' %(\"Transmittance = \",Tr)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Transmittance =  0.026\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example E2 - Pg 450"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#calculate the Quenching rate constant and half life\n",
+      "#Initialization of variables\n",
+      "import math\n",
+      "import numpy as np\n",
+      "from numpy import linalg\n",
+      "Q=[1., 2., 3., 4., 5]\n",
+      "t1=[5.2, 9.4, 13.7, 18., 22.2]\n",
+      "t2=[1.1, 2., 2.9, 4., 4.5]\n",
+      "#calculations\n",
+      "A = np.vstack([Q, np.ones(len(Q))]).T\n",
+      "kqbykf=np.linalg.lstsq(A,t1)[0]\n",
+      "slope1=kqbykf[0] *1000.\n",
+      "kq=np.linalg.lstsq(A,t2)[0]\n",
+      "slope2=kq[0] *math.pow(10,10)\n",
+      "kq=slope2\n",
+      "kf=kq/slope1\n",
+      "thalf=math.log (2) /kf\n",
+      "#results\n",
+      "print '%s %.1e %s' %(\"Quenching rate constant =\",kq,\"L ml^-1 s^-1\")\n",
+      "print '%s %.1e %s' %(\"\\n Half life=\",thalf,\"s\")\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Quenching rate constant = 8.8e+09 L ml^-1 s^-1\n",
+        "\n",
+        " Half life= 3.4e-07 s\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file