Wall clock time and date at job start Sat Apr 11 2020 06:10:26 AMSOL-version 7.1 by G. D. Hawkins, D. J. Giesen, G. C. Lynch, C. C. Chambers, I. Rossi, J. W. Storer, J. Li, J. D. Thompson, P. Winget, B. J. Lynch, D. Rinaldi, D. A. Liotard, C. J. Cramer, and D. G. Truhlar Copyright 2004 by Regents of the University of Minnesota. All rights reserved. Notice: recipients of this code are asked to comply with the user agreement in Section 1 of the documentation file. ******************************************************************************* * 1SCF - SCF CALCULATION WITHOUT GEOMETRY OPTIMIZATION * - USE EF ROUTINE FOR MINIMUM SEARCH (DEFAULT) * GEO-OK - OVERRIDE INTERATOMIC DISTANCE CHECK * TLIMIT= - A TIME OF 15. SECONDS REQUESTED * CHARGE - CHARGE ON SYSTEM= -1 * AM1 - THE AM1 HAMILTONIAN TO BE USED * DEV - DEVELOPER OPTIONS ARE ALLOWED * SM5.42R - SM5.42R CALCULATIONS WILL BE PERFORMED * - CHARGE MODEL 2 WILL BE USED (CM2A) * - THE SOLVENT IS USER-SPECIFIED * DIELEC - THE SOLVENT DIELECTRIC CONSTANT IS 2.06 * IOFR - THE SOLVENT INDEX OF REFRACTION IS 1.4345 * ALPHA - THE SOLVENT ALPHA IS 0.00 * BETA - THE SOLVENT BETA IS 0.00 * GAMMA - THE SOLVENT MACROSCOPIC SURFACE TENSION IS * 38.93 CAL MOL^-1 ANGSTROM^-2 * FACARB - THE FRACTION OF AROMATIC CARBONS IS 0.00 * FEHALO - THE FRACTION OF ELECTRONEGATIVE HALOGENS IS 0.00 ******************************************************************************* Atom NO. Chemical Bond length Bond angle Dihedral angle number (k) symbol (angstroms) (degrees) (degrees) (I) NA:I NB:NA:I NC:NB:NA:I NA NB NC 1 1 C 2 2 C 1.31004 * 1 3 3 C 1.50700 * 119.99982 * 2 1 4 4 C 1.50701 * 119.99817 * 180.02562 * 2 1 3 5 5 C 1.52997 * 109.47212 * 94.99810 * 4 2 1 6 6 N 1.46894 * 109.47515 * 179.97438 * 5 4 2 7 7 C 1.46900 * 111.00559 * 180.02562 * 6 5 4 8 8 H 1.09006 * 109.45740 * 325.00195 * 7 6 5 9 9 C 1.53033 * 109.46123 * 84.97223 * 7 6 5 10 10 C 1.53197 * 109.31510 * 181.40390 * 9 7 6 11 11 N 1.46927 * 108.76031 * 305.34307 * 10 9 7 12 12 C 1.34779 * 120.63097 * 233.63582 * 11 10 9 13 13 O 1.21273 * 120.00093 * 179.97438 * 12 11 10 14 14 C 1.50699 * 119.99942 * 359.97438 * 12 11 10 15 15 S 1.80999 * 109.47369 * 180.02562 * 14 12 11 16 16 C 1.76196 * 100.00318 * 180.02562 * 15 14 12 17 17 H 1.08005 * 119.99814 * 359.97438 * 16 15 14 18 18 C 1.38792 * 120.00289 * 180.02562 * 16 15 14 19 19 N 1.31636 * 120.00538 * 179.97438 * 18 16 15 20 20 Si 1.86809 * 119.99896 * 359.97438 * 18 16 15 21 21 H 1.48498 * 109.46816 * 90.00003 * 20 18 16 22 22 H 1.48495 * 109.47057 * 209.99902 * 20 18 16 23 23 H 1.48497 * 109.46718 * 330.00230 * 20 18 16 24 24 C 1.46928 * 118.73865 * 53.61929 * 11 10 9 25 25 C 1.53040 * 109.46358 * 205.02852 * 7 6 5 26 26 H 1.08994 * 109.49650 * 298.59933 * 25 7 6 27 27 C 1.53009 * 109.49558 * 58.66183 * 25 7 6 28 28 C 1.53001 * 109.46815 * 185.00244 * 27 25 7 29 29 H 1.08006 * 119.99962 * 180.02562 * 1 2 3 30 30 H 1.07999 * 119.99833 * 359.97438 * 1 2 3 31 31 H 1.08997 * 109.46989 * 270.00021 * 3 2 1 32 32 H 1.08999 * 109.46821 * 30.00203 * 3 2 1 33 33 H 1.09005 * 109.46731 * 150.00245 * 3 2 1 34 34 H 1.09002 * 109.47060 * 214.99865 * 4 2 1 35 35 H 1.09001 * 109.47380 * 334.99953 * 4 2 1 36 36 H 1.09002 * 109.47153 * 299.99998 * 5 4 2 37 37 H 1.08998 * 109.47533 * 59.99628 * 5 4 2 38 38 H 1.00899 * 111.00176 * 303.95826 * 6 5 4 39 39 H 1.09008 * 109.49930 * 301.33971 * 9 7 6 40 40 H 1.09001 * 109.49856 * 61.43281 * 9 7 6 41 41 H 1.08999 * 109.58335 * 185.56857 * 10 9 7 42 42 H 1.08997 * 109.71281 * 65.20138 * 10 9 7 43 43 H 1.09003 * 109.46881 * 299.99982 * 14 12 11 44 44 H 1.09000 * 109.47098 * 59.99566 * 14 12 11 45 45 H 0.96996 * 120.00298 * 179.97438 * 19 18 16 46 46 H 1.09000 * 109.58303 * 186.60173 * 24 11 10 47 47 H 1.08998 * 109.70361 * 66.24230 * 24 11 10 48 48 H 1.08999 * 109.47175 * 305.00025 * 27 25 7 49 49 H 1.09002 * 109.46922 * 65.00362 * 27 25 7 50 50 H 1.08999 * 109.47070 * 299.99845 * 28 27 25 51 51 H 1.08999 * 109.47331 * 59.99565 * 28 27 25 52 52 H 1.09000 * 109.46879 * 180.02562 * 28 27 25 Note: An asterisk (*) indicates this parameter was or will be optimized. Cartesian coordinates (angstroms) NO. Atom X Y Z 1 6 0.0000 0.0000 0.0000 2 6 1.3100 0.0000 0.0000 3 6 2.0635 1.3051 0.0000 4 6 2.0635 -1.3051 -0.0006 5 6 2.4273 -1.6834 -1.4377 6 7 3.1623 -2.9552 -1.4383 7 6 3.5296 -3.3505 -2.8046 8 1 2.7415 -3.0481 -3.4944 9 6 4.8411 -2.6672 -3.1980 10 6 5.2027 -3.0539 -4.6355 11 7 5.2319 -4.5193 -4.7375 12 6 6.3181 -5.1524 -5.2232 13 8 6.3300 -6.3626 -5.3019 14 6 7.5178 -4.3566 -5.6684 15 16 8.8016 -5.4837 -6.2663 16 6 10.0490 -4.3203 -6.7078 17 1 9.8743 -3.2633 -6.5710 18 6 11.2557 -4.7620 -7.2322 19 7 12.1875 -3.8928 -7.5625 20 14 11.5577 -6.5902 -7.4694 21 1 11.1052 -6.9948 -8.8246 22 1 13.0080 -6.8750 -7.3262 23 1 10.7997 -7.3539 -6.4459 24 6 4.0545 -5.2815 -4.2997 25 6 3.7057 -4.8695 -2.8661 26 1 4.5101 -5.1699 -2.1947 27 6 2.4040 -5.5521 -2.4409 28 6 2.6177 -7.0660 -2.3823 29 1 -0.5400 -0.9354 0.0004 30 1 -0.5400 0.9353 0.0004 31 1 2.2452 1.6197 -1.0276 32 1 1.4744 2.0647 0.5139 33 1 3.0160 1.1747 0.5138 34 1 2.9742 -1.1992 0.5889 35 1 1.4386 -2.0857 0.4334 36 1 1.5166 -1.7893 -2.0272 37 1 3.0522 -0.9029 -1.8718 38 1 3.9775 -2.9020 -0.8462 39 1 4.7221 -1.5856 -3.1314 40 1 5.6352 -2.9884 -2.5239 41 1 6.1837 -2.6506 -4.8866 42 1 4.4566 -2.6545 -5.3225 43 1 7.2269 -3.6792 -6.4713 44 1 7.9032 -3.7794 -4.8279 45 1 13.0310 -4.2016 -7.9287 46 1 4.2780 -6.3480 -4.3293 47 1 3.2121 -5.0663 -4.9570 48 1 2.1077 -5.1887 -1.4570 49 1 1.6209 -5.3235 -3.1639 50 1 2.9141 -7.4295 -3.3662 51 1 3.4009 -7.2947 -1.6595 52 1 1.6903 -7.5524 -2.0799 RHF calculation, no. of doubly occupied orbitals= 63 REFERENCES FOR PARAMETERS IN GAS-PHASE HAMILTONIAN: H: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) C: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) N: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) O: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) Si: (AM1): M.J.S.DEWAR, C. JIE, ORGANOMETALLICS, 6, 1486-1490 (1987). S: (AM1): M.J.S. DEWAR, Y.-C. YUAN, INORGANIC CHEM., 29, 589 (1990) REFERENCE FOR CHARGE MODEL 2: J. Li, J. Xing, C. J. Cramer, and D. G. Truhlar, J. Chem. Phys. 111 (1999) 885. REFERENCE FOR THE PARAMETERIZATION OF THE SM5.42R SOLVATION MODEL: J. Li, T. Zhu, G. D. Hawkins, P. Winget, D. A. Liotard, C. J. Cramer, and D. G. Truhlar, Theor. Chem. Acc. 103 (1999) 9-63 P. Winget, J. D. Thompson C. J. Cramer,and D. G. Truhlar, J. Phys. Chem. B. submitted. CHARGE=-1 AM1 1SCF TLIMIT=15 GEO-OK SM5.42R & SOLVNT=GENORG IOFR=1.4345 ALPHA=0.00 BETA=0.00 GAMMA=38.93 & DIELEC=2.06 FACARB=0.00 FEHALO=0.00 DEV ZINC001723364414.mol2 52 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Sat Apr 11 2020 06:10:26 Heat of formation + Delta-G solvation = -39.609200 kcal Electronic energy + Delta-G solvation = -27540.985163 eV Core-core repulsion = 23859.058191 eV Total energy + Delta-G solvation = -3681.926971 eV No. of doubly occupied orbitals = 63 Molecular weight (most abundant/longest-lived isotopes) = 340.193 amu Computer time = 0.61 seconds Orbital eigenvalues (eV) -40.32278 -38.42495 -37.10550 -35.04960 -34.55281 -32.44650 -31.53810 -30.27663 -29.15034 -27.97143 -27.52873 -25.64229 -24.56852 -24.09128 -22.71632 -21.61200 -20.45640 -19.27876 -18.72304 -17.69820 -16.86504 -16.08556 -15.96991 -15.64784 -15.27320 -15.17708 -14.98405 -14.80186 -14.35764 -14.12324 -13.93614 -13.72856 -13.62851 -13.42885 -13.38385 -13.08929 -12.80984 -12.74248 -12.36001 -12.20763 -12.14576 -12.00238 -11.94222 -11.67374 -11.50356 -11.35223 -11.27489 -11.19175 -11.01502 -10.86962 -10.70427 -10.60726 -10.42963 -9.86117 -9.47163 -9.43196 -9.01084 -8.74978 -8.53330 -8.48921 -6.92570 -6.29738 -4.01440 1.80937 2.71213 2.93580 3.19771 3.32881 3.50288 3.58489 3.75439 4.32296 4.33799 4.46695 4.49245 4.55158 4.69381 4.76666 4.78800 4.87238 4.92627 4.99133 5.09093 5.09568 5.11167 5.17593 5.21136 5.23919 5.26075 5.30471 5.43705 5.44432 5.50074 5.53851 5.54601 5.58575 5.65199 5.69602 5.74417 5.76460 5.79891 5.88857 5.94328 5.97621 6.05018 6.19510 6.24145 6.30194 6.46070 6.59662 6.70594 7.03874 7.47344 7.93221 8.40190 8.44886 9.16541 10.79412 Molecular weight = 340.19amu Principal moments of inertia in cm(-1) A = 0.015462 B = 0.002253 C = 0.002013 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1810.451939 B =12427.056644 C =13903.485308 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.196 4.196 2 C -0.124 4.124 3 C -0.121 4.121 4 C -0.084 4.084 5 C 0.066 3.934 6 N -0.682 5.682 7 C 0.094 3.906 8 H 0.078 0.922 9 C -0.165 4.165 10 C 0.111 3.889 11 N -0.618 5.618 12 C 0.534 3.466 13 O -0.519 6.519 14 C -0.121 4.121 15 S -0.142 6.142 16 C -0.521 4.521 17 H 0.088 0.912 18 C 0.095 3.905 19 N -0.880 5.880 20 Si 0.857 3.143 21 H -0.267 1.267 22 H -0.274 1.274 23 H -0.235 1.235 24 C 0.116 3.884 25 C -0.088 4.088 26 H 0.075 0.925 27 C -0.106 4.106 28 C -0.157 4.157 29 H 0.098 0.902 30 H 0.096 0.904 31 H 0.067 0.933 32 H 0.062 0.938 33 H 0.062 0.938 34 H 0.067 0.933 35 H 0.077 0.923 36 H 0.071 0.929 37 H 0.031 0.969 38 H 0.341 0.659 39 H 0.073 0.927 40 H 0.072 0.928 41 H 0.090 0.910 42 H 0.068 0.932 43 H 0.095 0.905 44 H 0.095 0.905 45 H 0.271 0.729 46 H 0.097 0.903 47 H 0.062 0.938 48 H 0.080 0.920 49 H 0.055 0.945 50 H 0.055 0.945 51 H 0.053 0.947 52 H 0.051 0.949 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -24.464 7.214 15.106 29.643 Note: The Mulliken population analysis charges presented below were not used in the solvation calculation but are provided for completeness. The chosen solvation model uses CM2 partial charges for calculating solvation energies. Net atomic charges, atomic populations, and dipole contributions using Mulliken population analysis Atom NO. Type Charge No. of electrons 1 C -0.233 4.233 2 C -0.125 4.125 3 C -0.178 4.178 4 C -0.122 4.122 5 C -0.063 4.063 6 N -0.312 5.312 7 C -0.016 4.016 8 H 0.096 0.904 9 C -0.205 4.205 10 C -0.013 4.013 11 N -0.354 5.354 12 C 0.321 3.679 13 O -0.393 6.393 14 C -0.272 4.272 15 S 0.084 5.916 16 C -0.668 4.668 17 H 0.106 0.894 18 C -0.113 4.113 19 N -0.517 5.517 20 Si 0.681 3.319 21 H -0.192 1.192 22 H -0.199 1.199 23 H -0.159 1.159 24 C -0.007 4.007 25 C -0.108 4.108 26 H 0.093 0.907 27 C -0.144 4.144 28 C -0.214 4.214 29 H 0.116 0.884 30 H 0.114 0.886 31 H 0.085 0.915 32 H 0.081 0.919 33 H 0.081 0.919 34 H 0.086 0.914 35 H 0.095 0.905 36 H 0.090 0.910 37 H 0.049 0.951 38 H 0.159 0.841 39 H 0.091 0.909 40 H 0.091 0.909 41 H 0.109 0.891 42 H 0.086 0.914 43 H 0.114 0.886 44 H 0.114 0.886 45 H 0.081 0.919 46 H 0.115 0.885 47 H 0.081 0.919 48 H 0.098 0.902 49 H 0.074 0.926 50 H 0.074 0.926 51 H 0.072 0.928 52 H 0.070 0.930 Dipole moment (debyes) X Y Z Total from point charges -24.827 5.067 14.925 29.408 hybrid contribution 1.109 1.646 -0.345 2.015 sum -23.718 6.713 14.580 28.639 Atomic orbital electron populations 1.23718 0.95264 1.01882 1.02430 1.21725 0.95435 0.95658 0.99672 1.20886 1.00166 0.94578 1.02161 1.20668 1.00288 0.94349 0.96885 1.21917 0.98232 0.89884 0.96291 1.60583 1.28903 1.31323 1.10365 1.21579 0.95340 0.94939 0.89706 0.90361 1.22663 0.99164 1.00789 0.97853 1.21642 1.03227 0.80334 0.96081 1.48081 1.15806 1.06710 1.64799 1.20283 0.83041 0.88167 0.76370 1.90683 1.81108 1.13978 1.53549 1.23308 0.96882 1.02803 1.04188 1.84800 1.11556 1.12564 1.82678 1.22304 1.00865 0.94753 1.48911 0.89443 1.24714 0.94670 0.98404 0.93539 1.69938 1.06162 1.34279 1.41319 0.86733 0.78770 0.85374 0.80975 1.19200 1.19942 1.15915 1.21677 0.87021 0.98203 0.93794 1.21515 0.98839 0.93874 0.96539 0.90693 1.21391 0.95937 0.94564 1.02499 1.21857 1.01310 0.96250 1.02022 0.88394 0.88602 0.91454 0.91908 0.91853 0.91394 0.90461 0.91024 0.95080 0.84053 0.90888 0.90935 0.89119 0.91405 0.88642 0.88635 0.91945 0.88523 0.91944 0.90173 0.92644 0.92623 0.92778 0.93036 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 14. Note: The number of geometries may not correspond to the number of cycles due to rejected geometry changes. In the following table subtotal= G_P + SS G_CDS. Atom Chem. CM2 G_P Area Sigma k SS G_CDS Subtotal M number symbol chg. (kcal) (Ang**2) cal/(Ang**2) (kcal) (kcal) value 1 C -0.20 -1.19 13.89 29.01 0.40 -0.79 16 2 C -0.12 -0.78 5.31 -101.07 -0.54 -1.31 16 3 C -0.12 -0.66 10.03 36.01 0.36 -0.30 16 4 C -0.08 -0.51 5.64 -27.88 -0.16 -0.67 16 5 C 0.07 0.43 5.46 -3.83 -0.02 0.41 16 6 N -0.68 -4.82 5.34 -106.69 -0.57 -5.39 16 7 C 0.09 0.75 1.89 -67.68 -0.13 0.63 16 8 H 0.08 0.64 7.80 -51.93 -0.40 0.24 16 9 C -0.16 -1.39 5.33 -26.61 -0.14 -1.53 16 10 C 0.11 1.15 6.34 -3.71 -0.02 1.13 16 11 N -0.62 -8.35 2.97 -172.77 -0.51 -8.87 16 12 C 0.53 9.72 7.72 -10.98 -0.08 9.64 16 13 O -0.52 -11.33 15.27 5.56 0.08 -11.24 16 14 C -0.12 -2.37 4.50 36.01 0.16 -2.21 16 15 S -0.14 -3.63 18.55 -107.50 -1.99 -5.62 16 16 C -0.52 -14.99 10.04 30.94 0.31 -14.68 16 17 H 0.09 2.62 8.03 -52.48 -0.42 2.19 16 18 C 0.10 2.79 5.50 -17.43 -0.10 2.70 16 19 N -0.88 -26.53 13.97 55.49 0.78 -25.75 16 20 Si 0.86 21.85 27.74 -169.99 -4.72 17.13 16 21 H -0.27 -6.73 7.11 56.52 0.40 -6.33 16 22 H -0.27 -6.72 7.11 56.52 0.40 -6.32 16 23 H -0.24 -6.00 6.74 56.52 0.38 -5.62 16 24 C 0.12 1.36 5.33 -3.71 -0.02 1.34 16 25 C -0.09 -0.83 2.06 -90.50 -0.19 -1.02 16 26 H 0.07 0.83 8.14 -51.93 -0.42 0.41 16 27 C -0.11 -0.90 5.31 -26.73 -0.14 -1.04 16 28 C -0.16 -1.41 9.67 37.16 0.36 -1.05 16 29 H 0.10 0.57 7.99 -52.48 -0.42 0.15 16 30 H 0.10 0.51 8.04 -52.49 -0.42 0.09 16 31 H 0.07 0.36 8.14 -51.93 -0.42 -0.07 16 32 H 0.06 0.31 8.06 -51.93 -0.42 -0.11 16 33 H 0.06 0.33 8.09 -51.93 -0.42 -0.09 16 34 H 0.07 0.40 8.10 -51.93 -0.42 -0.02 16 35 H 0.08 0.51 7.99 -51.93 -0.41 0.09 16 36 H 0.07 0.51 8.06 -51.93 -0.42 0.09 16 37 H 0.03 0.21 7.41 -51.93 -0.38 -0.18 16 38 H 0.34 2.36 8.48 -39.29 -0.33 2.03 16 39 H 0.07 0.53 7.42 -51.92 -0.39 0.15 16 40 H 0.07 0.68 8.14 -51.93 -0.42 0.26 16 41 H 0.09 0.98 5.93 -51.93 -0.31 0.68 16 42 H 0.07 0.61 8.14 -51.93 -0.42 0.19 16 43 H 0.10 1.75 7.94 -51.91 -0.41 1.33 16 44 H 0.10 1.74 7.69 -51.92 -0.40 1.35 16 45 H 0.27 7.58 8.31 -40.82 -0.34 7.24 16 46 H 0.10 1.34 5.73 -51.93 -0.30 1.04 16 47 H 0.06 0.66 8.14 -51.93 -0.42 0.23 16 48 H 0.08 0.70 7.41 -51.93 -0.38 0.31 16 49 H 0.05 0.46 8.14 -51.93 -0.42 0.03 16 50 H 0.05 0.54 6.70 -51.93 -0.35 0.19 16 51 H 0.05 0.51 8.14 -51.93 -0.42 0.09 16 52 H 0.05 0.41 8.14 -51.93 -0.42 -0.01 16 LS Contribution 419.13 15.07 6.32 6.32 Total: -1.00 -32.46 419.13 -10.11 -42.57 By element: Atomic # 1 Polarization: 9.19 SS G_CDS: -9.55 Total: -0.36 kcal Atomic # 6 Polarization: -8.83 SS G_CDS: 0.06 Total: -8.77 kcal Atomic # 7 Polarization: -39.70 SS G_CDS: -0.31 Total: -40.01 kcal Atomic # 8 Polarization: -11.33 SS G_CDS: 0.08 Total: -11.24 kcal Atomic # 14 Polarization: 21.85 SS G_CDS: -4.72 Total: 17.13 kcal Atomic # 16 Polarization: -3.63 SS G_CDS: -1.99 Total: -5.62 kcal Total LS contribution 6.32 Total: 6.32 kcal Total: -32.46 -10.11 -42.57 kcal The number of atoms in the molecule is 52 The average number of expansion shells was 16.00 The maximum number of expansion shells was 16 The minimum number of expansion shells was 16 **** NOTA BENE **** This is the net solvation energy for this exact molecular structure (nuclear and electronic)! The standard-state solvation energy should be obtained as the difference between the heat of formation plus delta-G solvation for the relaxed solvated system and that for the relaxed gas-phase system. ZINC001723364414.mol2 52 1SCF run This is a breakdown of the solvation energy calculated without geometric relaxation in solution: (1) E-EN(sol) electronic-nuclear energy of solute 2.958 kcal (2) G-P(sol) polarization free energy of solvation -32.460 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -29.502 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.107 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -42.567 kcal (6) G-S(sol) free energy of system = (1) + (5) -39.609 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.61 seconds