C FGHEVEN
C F. Gogtas, G.G. Balint-Kurti and C.C. Marston,
C QCPE Program No. 647, (1993).
C
C ***************************************************************
C This program solves one dimensional Schrodinger equation for
C bound state eigenvalues and eigenfunctions corresponding to a
C potential V(x).
C
C The Fourier Grid Hamiltonian method is used in the program.
C This method is fully described in:
C C.C. Marston and G.G.Balint-Kurti, J.Chem. Phys.,91,3571(1989).
C and
C G.G. Balint-Kurti, R.N. Dixon and C.C. Marston, Internat. Rev.
C Phys. Chem.,11, 317 (1992).
C
C The program uses an even number of grid points. The Hamiltonian
C matrix elements are calculated using analytic formula described
C in the second of the above references.
C
C The analytical Hamiltonian expression given in the reference
C contains a small error. The formula should read:
C
C H(i,j) = {(h**2)/(4*m*(L**2)} *
C [(N-1)(N-2)/6 + (N/2)] + V(Xi), if i=j
C
C H(i,j) = {[(-1)**(i-j)] / m } *
C { h/[2*L*sin(pi*(i-j)/N)]}**2 , if i#j
C
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