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+// Scilab Code Ex6.13: Page-203 (2006)

+clc; clear;

+e = 1.6e-019;   // Energy equivalent of 1 eV, J/eV

+epsilon = 15.8;  // Dielectric constant of Ge   

+m = 9.1e-031;   // Mass of an electron, kg

+m_e = 0.2*m;     // Effective masses of the electron in Ge, kg

+a_Ge = 5.65;    // Lattice parameter of Ge, angstrom

+A_d = 0.53*epsilon*(m/m_e);    // Radius of donor atom, angstrom

+printf("\nThe radius of the orbits of fifth valence electron of acceptor impurity = %2d angstrom", ceil(A_d));

+printf("\nThis radius is %d times the lattice constant of Ge", ceil(A_d/a_Ge));

+

+// Result 

+// The radius of the orbits of fifth valence electron = 42 angstrom 

+// This radius is 8 times the lattice constant of Ge