{
 "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": {}
  }
 ]
}