Programming Project 2: Harmonic Vibrational Frequencies
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1 Programming Project 2: Harmonic Vibrational Frequencies Center for Computational Chemistry University of Georgia Athens, Georgia Summer Introduction This is the second programming project at the Center for Computational Quantum Chemistry In this program, you will use several PSI4 output files to determine molecular vibrational frequencies and spectroscopic intensities All matrices are provided in the cartesian coordinate framework Again, ethylene in the provided test case This program should be completed in C or C++ along with certain PSI4 libraries Good luck! 1
2 2 Procedure 1 Read in the molecular geometry from file11dat File11dat is an output file generated by PSI4 The first line is a title specifying the calculation that was run, including the basis set The next line contains the number of atoms, N, and the calculated SCF energy The next N lines contain the atomic charge and the molecular Cartesian coordinates: Z 1 x 1 y 1 z 1 Z 2 x 2 y 2 z 2 Z n x n y n z n (1) The final N lines contain the derivative of the energy with respect to each Cartesian coordinate, and are not required for this project All units are bohr 2 Read in the Hessian matrix (H) from file15dat The Hessian matrix contains the second-order partial derivatives of the energy with respect to nuclear coordinates It is a 3N by 3N matrix symbolically filled as follows The label x 1 refers to the x coordinate of atom 1, y 1 refers to the y coordinate of atom 1, and so forth 2 x 1 x 2 2 y 1 x 2 2 z 1 x 2 x 2 x 2 x 2 2 x 2 x 2 y 2 y 2 y 2 x 2 y 2 y 2 x 2 2 z n (2) 2
3 The first line of file15dat contains the number of atoms, N, and six times that number, 6N The next 3N 2 lines each contain 3 partial derivatives as follows: 2 x 1 x 2 x n x n y 2 y n 2 y 1 y n z 2 2 z n (3) You will read in the values in the order of file15dat, but you should store them analagously to the example Hessian The units are hartree/bohr 2 3 Read in the dipole moment derivative matrix, D, from file17dat File17dat contains the first partial derivatives of the Cartesian dipole moments (µ x, µ y, µ z ) with respect to nuclear coordinates µ x is the partial derivative of the energy (E) with respect to an applied electric field (E x ) Mathematically, this is µ x = E/ E x Thus, the x dipole derivative with respect to nuclear coordinate z 1 is / = / E x The dipole derivative matrix, D, is a 3 by 3N matrix symbolically filled as follows: x 2 y 2 µ y µ y µ y µ y µ y µ y (4) x 2 y 2 x 2 y 2 3
4 The first line of file17dat contains the number of atoms, N, and three times that number, 3N The next 3N lines each contain 3 partial derivatives as follows: x 2 y 2 z 2 x n y n (5) µ y µ y µ y x n y n The values will be read in according to file17dat, but should be stored in your program as in (4) The units are Debye/Å 4 Read in the polarizability derivative matrix, P, from file18dat File18dat is an file containing the partial derivatives of the polarizability with respect to nuclear coordinates The xy polarizability tensor is a 3 by 3 matrix, α α xx α xy α xz α yx α yy α yz (6) α zx α zy α zz α xy is the second-order partial derivative of the energy (E) with respect to applied electric fields (E x, E y ) Mathematically, this is α xy = / E x E y Thus, the xy polarizability derivative with respect to nuclear coordinate z 1 is α xy / = 3 E/ E x E y 4
5 The polarizability derivative matrix, P, is a 6 by 3N matrix symbolically filled as follows: α xy α xy α xy α xy α xy α yy α yy α yy α yy α yy α zx α zx α zx α zx α (7) zx α zy α zy α zy α zy α zy α zz α zz α zz α zz α zz The first line of file18dat contains the number of atoms, N, and three times that number, 3N The next 6N lines each contain 3 partial derivatives: x n α xy y n α xy α xy (8) α zz x n α zz y n α zz The values will be read in according to file18dat, but should be stored in your program following the polarizability derivative matrix example The units are Å 5
6 5 Form the mass-weighted Hessian matrix, H mw This can be done in one of two ways: 1 The matrix can be scaled element by element: H mw [i][j] = H[i][j] Mi M j (9) 2 It can be formulated as a matrix multiply by a diagonal 3N by 3N mass matrix M: 1 M M M1 0 (10) M2 6 Diagonalize the mass-weighted Hessian H mw = M T HM (11) V 1 H mw V = Λ (12) V is the eigenvector matrix and Λ is the eigenvalue matrix The eigenvalues (λ i ) appear on the diagonals of Λ 7 Determine the harmonic vibrational frequencies, ω i ω i = constant λ i (13) The C in the above equation is a conversion factor Frequencies should be reported in MHz and cm 1 Many helpful physical constants are included in PSI4 in physconsth 8 Mass-weight the eigenvector matrix, V, to form T T is the normal-coordinate transformation matrix, which can be used to transform matrices from cartesian coordinates to normal coordinates T = MV (14) 6
7 9 Transform the dipole derivative matrix, D, to the normal coordinate system Q = X X Q D T (15) X refers to cartesian coordinates and Q refers to normal coordinates 10 Compute the infrared intensities (I i ) for each vibrational mode IR intensities should be computed in a) Debye 2 /(amu Å 2 ), b) km/mol, and c) L/(cm 2 mol) I i = constant 3 n=1 ( µi Q n ) 2 (16) The summation over n means to sum the x, y, and z components Hint: ln(10) is involved in the conversion factor for part c) 11 Transform the polarizability derivative matrix, P, to the normal coordinate system α xy Q = α xy X X Q P T (17) 12 Compute the Raman scattering activity (I i ) for each vibrational mode I i = 45α 2 i + 7γ 2 i (18) where α i = α i,xx + α i,yy + α i,zz 3 (19) γ 2 i = (α i,xx α i,yy ) 2 + (α i,yy α i,zz ) 2 + (α i,zz α i,xx ) 2 + 6(α 2 i,xy + α 2 i,xz + α 2 i,yz) 2 (20) 13 Compute the Raman depolarization ratio (ρ i ) for each vibrational mode ρ i = 3γ 2 i 45α 2 i + 4γ2 i 7 (21)
8 3 Sample Output Sample output is provided in the sampleout file Please note that doubleprecision arithmetic and different conversion factors may result in slightly different answers 4 References EB Wilson, Jr, JC Decius, and PC Cross, Molecular Vibrations, McGraw-Hill, 1955 WB Person and G Zerbi editors, Vibrational ntensities in Infrared and Raman Spectroscopy, Elsevier, Amsterdam, 1982 BS Galabov and T Dudev, Vibrational Intensities, Elsevier, Amsterdam,
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