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+//Example 7// Ch 4
+clc;
+clear;
+close;
+// given data
+V = 9*10^3; //in V
+d = 0.002;//two parallel plates spaced by distance d in meters
+// 1/mean free path is equal to a*p where a is constant
+s = 11253.7;//constant value in m^-1kPa^-1
+B = 273840;//constant value in V/mkPa
+p = 101.3;// in kPa
+E = V/d;
+t = (-B*p)/E;
+alpha = p * s * exp(t);
+printf("electric field %e V/m \n",E)
+printf("ionization cofficient %f m^-1 \n",alpha)
+z = 1/(exp(alpha*d)-1);//secondary coefficient of ionization
+printf("secondary coefficient of ionization %f \n",z)