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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 18: Electronic transistions"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 18.1_e: example_1.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc\n",
+"//Initialization of variables\n",
+"wl=256*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=-log10(T) /(C*t)\n",
+"A1=-log10(T)\n",
+"A2=E*C*t2\n",
+"Tr=10^(-A2)\n",
+"//results\n",
+"printf('Transmittance = %.3f',Tr)"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 18.2_e: example_2.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc\n",
+"//Initialization of variables\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",
+"kqbykf=regress(Q,t1)\n",
+"slope1=kqbykf(2) *10^3\n",
+"kq=regress(Q,t2)\n",
+"slope2=kq(2) *10^10\n",
+"kq=slope2\n",
+"kf=kq/slope1\n",
+"thalf=log (2) /kf\n",
+"//results\n",
+"printf('Quenching rate constant = %.1e L ml^-1 s^-1',kq)\n",
+"printf('\n Half life= %.1e s',thalf)"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}