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diff --git a/Elements_of_Physical_Chemistry_by_Atkins_Peter/Chapter17.ipynb b/Elements_of_Physical_Chemistry_by_Atkins_Peter/Chapter17.ipynb
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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 17 - Molecular rotations and vibrations"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example E1 - Pg 423"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#calculate the frequency of transistion\n",
+      "#Initialization of variables\n",
+      "import math\n",
+      "mH=1.673*math.pow(10,-27) #kg\n",
+      "mCl=5.807*math.pow(10,-26) #kg\n",
+      "R=127.4 *math.pow(10,-12) #m\n",
+      "#calculations\n",
+      "mu=mH*mCl/(mH+mCl)\n",
+      "I=mu*R*R\n",
+      "B=1.05457*math.pow(10,-34) /(4*math.pi*I)\n",
+      "f=2*B/math.pow(10,9)\n",
+      "#results\n",
+      "print '%s %.1f %s' %(\"Frequency of transistion =\",f,\"GHz\")\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Frequency of transistion = 635.9 GHz\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example I1 - Pg 428"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#calculate the wavenumber and wavelength\n",
+      "#Initialization of variables\n",
+      "import math\n",
+      "v=89.6*math.pow(10,12) #Hz\n",
+      "#calculations\n",
+      "l=3*math.pow(10,8) /v\n",
+      "wn=math.pow(10,-2) /l\n",
+      "#results\n",
+      "print '%s %d %s' %(\"Wavenumber =\",wn,\" cm^-1\")\n",
+      "print '%s %.2f %s' % (\"\\n Wavelength =\",l*math.pow(10,6),\"mu m\")\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Wavenumber = 2986  cm^-1\n",
+        "\n",
+        " Wavelength = 3.35 mu m\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file