Wall clock time and date at job start Wed Apr 1 2020 00:23:48 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 O 1.42897 * 1 3 3 C 1.42900 * 113.99943 * 2 1 4 4 C 1.53005 * 109.47066 * 180.02562 * 3 2 1 5 5 H 1.08996 * 109.46938 * 55.00015 * 4 3 2 6 6 C 1.52995 * 109.46885 * 294.99601 * 4 3 2 7 7 C 1.50703 * 109.46702 * 174.99974 * 4 3 2 8 8 O 1.21278 * 120.00491 * 29.30318 * 7 4 3 9 9 N 1.34780 * 119.99576 * 209.30168 * 7 4 3 10 10 C 1.47153 * 120.99062 * 354.90545 * 9 7 4 11 11 C 1.53296 * 108.37545 * 230.61937 * 10 9 7 12 12 H 1.08998 * 109.51275 * 67.57967 * 11 10 9 13 13 C 1.52998 * 109.50885 * 187.67641 * 11 10 9 14 14 O 1.42962 * 109.27073 * 307.62587 * 11 10 9 15 15 C 1.42989 * 114.15401 * 62.45848 * 14 11 10 16 16 C 1.52981 * 109.54992 * 57.52437 * 15 14 11 17 17 C 1.53188 * 109.34927 * 59.01119 * 16 15 14 18 18 N 1.46935 * 108.77429 * 54.57185 * 17 16 15 19 19 C 1.36933 * 120.64070 * 126.35417 * 18 17 16 20 20 H 1.08005 * 120.00049 * 209.26165 * 19 18 17 21 21 C 1.38813 * 120.00155 * 29.26117 * 19 18 17 22 22 N 1.31621 * 119.99996 * 12.52824 * 21 19 18 23 23 Si 1.86799 * 120.00074 * 192.53420 * 21 19 18 24 24 H 1.48499 * 109.47168 * 359.97438 * 23 21 19 25 25 H 1.48501 * 109.47179 * 119.99831 * 23 21 19 26 26 H 1.48503 * 109.46973 * 239.99899 * 23 21 19 27 27 C 1.46927 * 118.71779 * 306.33321 * 18 17 16 28 28 C 1.52996 * 109.53186 * 177.81009 * 15 14 11 29 29 C 1.47155 * 120.98600 * 174.92890 * 9 7 4 30 30 H 1.09006 * 109.47159 * 179.97438 * 1 2 3 31 31 H 1.08997 * 109.47098 * 299.99459 * 1 2 3 32 32 H 1.09002 * 109.47257 * 60.00469 * 1 2 3 33 33 H 1.08993 * 109.47498 * 60.00020 * 3 2 1 34 34 H 1.09006 * 109.47191 * 299.99849 * 3 2 1 35 35 H 1.09000 * 109.46927 * 185.06773 * 6 4 3 36 36 H 1.08998 * 109.47625 * 305.07009 * 6 4 3 37 37 H 1.08998 * 109.47132 * 65.07079 * 6 4 3 38 38 H 1.09000 * 109.68478 * 110.89309 * 10 9 7 39 39 H 1.09002 * 109.68214 * 350.33984 * 10 9 7 40 40 H 1.09004 * 109.47203 * 59.90240 * 13 11 10 41 41 H 1.09000 * 109.47219 * 179.90127 * 13 11 10 42 42 H 1.09003 * 109.47376 * 299.89988 * 13 11 10 43 43 H 1.09001 * 109.49076 * 178.97526 * 16 15 14 44 44 H 1.09003 * 109.48939 * 299.04569 * 16 15 14 45 45 H 1.08999 * 109.58473 * 294.78368 * 17 16 15 46 46 H 1.09000 * 109.58983 * 174.35755 * 17 16 15 47 47 H 0.96998 * 120.00332 * 180.02562 * 22 21 19 48 48 H 1.09009 * 109.58251 * 293.88521 * 27 18 17 49 49 H 1.08998 * 109.58734 * 173.46291 * 27 18 17 50 50 H 1.09007 * 109.48971 * 60.94079 * 28 15 14 51 51 H 1.08997 * 109.49219 * 180.99252 * 28 15 14 52 52 H 1.08997 * 109.67618 * 249.22134 * 29 9 7 53 53 H 1.08998 * 109.67652 * 9.76645 * 29 9 7 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 8 1.4290 0.0000 0.0000 3 6 2.0102 1.3055 0.0000 4 6 3.5355 1.1846 -0.0006 5 1 3.8507 0.5685 -0.8427 6 6 3.9962 0.5365 1.3064 7 6 4.1478 2.5561 -0.1245 8 8 3.5612 3.5238 0.3116 9 7 5.3476 2.7070 -0.7199 10 6 6.1289 1.5391 -1.1568 11 6 7.5530 1.6771 -0.6066 12 1 7.5346 1.5825 0.4791 13 6 8.4387 0.5798 -1.2002 14 8 8.0754 2.9586 -0.9655 15 6 7.3505 4.0611 -0.4145 16 6 7.3235 3.9450 1.1107 17 6 8.7594 3.9331 1.6443 18 7 9.4607 5.1222 1.1412 19 6 10.0921 5.9774 2.0044 20 1 10.1862 7.0241 1.7553 21 6 10.6111 5.4991 3.1997 22 7 10.7206 4.2025 3.3976 23 14 11.1541 6.6956 4.5274 24 1 10.9290 8.0876 4.0615 25 1 10.3676 6.4536 5.7636 26 1 12.5979 6.4969 4.8124 27 6 9.4719 5.3757 -0.3060 28 6 8.0283 5.3720 -0.8183 29 6 5.9153 4.0447 -0.9518 30 1 -0.3634 -1.0277 -0.0005 31 1 -0.3633 0.5137 0.8900 32 1 -0.3634 0.5138 -0.8900 33 1 1.6886 1.8464 0.8899 34 1 1.6886 1.8464 -0.8900 35 1 5.0855 0.5322 1.3455 36 1 3.6045 1.1034 2.1510 37 1 3.6269 -0.4879 1.3539 38 1 6.1578 1.5034 -2.2459 39 1 5.6730 0.6273 -0.7711 40 1 8.4566 0.6750 -2.2860 41 1 9.4515 0.6796 -0.8100 42 1 8.0389 -0.3969 -0.9277 43 1 6.7864 4.7955 1.5307 44 1 6.8216 3.0205 1.3962 45 1 9.2701 3.0342 1.2989 46 1 8.7444 3.9515 2.7340 47 1 11.0830 3.8682 4.2330 48 1 10.0404 4.5936 -0.8095 49 1 9.9274 6.3461 -0.5035 50 1 8.0276 5.4621 -1.9047 51 1 7.4855 6.2111 -0.3834 52 1 5.9208 4.2609 -2.0201 53 1 5.3189 4.7922 -0.4286 RHF calculation, no. of doubly occupied orbitals= 66 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). 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 ZINC001111540912.mol2 53 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Wed Apr 1 2020 00:23:48 Heat of formation + Delta-G solvation = -100.065308 kcal Electronic energy + Delta-G solvation = -32636.130983 eV Core-core repulsion = 28508.829567 eV Total energy + Delta-G solvation = -4127.301416 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.220 amu Computer time = 1.39 seconds Orbital eigenvalues (eV) -40.84100 -39.17970 -37.93736 -36.38359 -34.64032 -33.99962 -33.29620 -31.46475 -30.12284 -29.68612 -27.76504 -27.23625 -26.41400 -25.88087 -24.37430 -22.76865 -22.39375 -21.63998 -20.55446 -19.04800 -18.78212 -17.75291 -16.95117 -16.53429 -16.21957 -16.04126 -15.46889 -15.42729 -15.02985 -14.80983 -14.63694 -14.39544 -13.94180 -13.78004 -13.48688 -13.33811 -13.21559 -13.00700 -12.72340 -12.59416 -12.36265 -12.31618 -11.98061 -11.82448 -11.74049 -11.53158 -11.48906 -11.40374 -11.38401 -11.11148 -10.97545 -10.75089 -10.53652 -10.32083 -10.22034 -10.10930 -9.95148 -9.83047 -9.71301 -9.48726 -9.27731 -8.44054 -8.35297 -6.58033 -5.73547 -3.18504 2.50160 2.71948 3.39204 3.46741 3.48821 3.55859 3.90965 4.33295 4.52848 4.58789 4.70036 4.71282 4.86872 5.01121 5.04240 5.07651 5.12817 5.15189 5.28542 5.32723 5.34834 5.38979 5.43675 5.44040 5.49880 5.52993 5.61231 5.63523 5.66976 5.71142 5.81872 5.89031 5.99899 6.07541 6.10786 6.22004 6.29692 6.36749 6.46185 6.48668 6.59295 6.71106 6.81796 6.85753 7.09537 7.29716 7.44973 7.61231 7.76020 7.83118 8.06398 8.51378 9.27285 9.90091 10.48031 11.34383 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.015409 B = 0.003097 C = 0.002930 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1816.626965 B = 9040.273322 C = 9554.924437 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.033 3.967 2 O -0.391 6.391 3 C 0.080 3.920 4 C -0.109 4.109 5 H 0.099 0.901 6 C -0.139 4.139 7 C 0.524 3.476 8 O -0.539 6.539 9 N -0.607 5.607 10 C 0.075 3.925 11 C 0.071 3.929 12 H 0.070 0.930 13 C -0.141 4.141 14 O -0.355 6.355 15 C 0.118 3.882 16 C -0.159 4.159 17 C 0.180 3.820 18 N -0.592 5.592 19 C -0.247 4.247 20 H 0.065 0.935 21 C 0.000 4.000 22 N -0.905 5.905 23 Si 0.903 3.097 24 H -0.278 1.278 25 H -0.290 1.290 26 H -0.290 1.290 27 C 0.151 3.849 28 C -0.117 4.117 29 C 0.088 3.912 30 H 0.086 0.914 31 H 0.042 0.958 32 H 0.040 0.960 33 H 0.063 0.937 34 H 0.051 0.949 35 H 0.062 0.938 36 H 0.063 0.937 37 H 0.075 0.925 38 H 0.076 0.924 39 H 0.092 0.908 40 H 0.061 0.939 41 H 0.071 0.929 42 H 0.068 0.932 43 H 0.062 0.938 44 H 0.048 0.952 45 H 0.021 0.979 46 H 0.088 0.912 47 H 0.252 0.748 48 H 0.027 0.973 49 H 0.052 0.948 50 H 0.058 0.942 51 H 0.072 0.928 52 H 0.070 0.930 53 H 0.098 0.902 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -15.500 -10.432 -10.610 21.486 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 -0.063 4.063 2 O -0.310 6.310 3 C 0.003 3.997 4 C -0.130 4.130 5 H 0.117 0.883 6 C -0.197 4.197 7 C 0.312 3.688 8 O -0.416 6.416 9 N -0.340 5.340 10 C -0.048 4.048 11 C 0.012 3.988 12 H 0.088 0.912 13 C -0.199 4.199 14 O -0.274 6.274 15 C 0.078 3.922 16 C -0.199 4.199 17 C 0.054 3.946 18 N -0.314 5.314 19 C -0.377 4.377 20 H 0.083 0.917 21 C -0.198 4.198 22 N -0.550 5.550 23 Si 0.733 3.267 24 H -0.203 1.203 25 H -0.217 1.217 26 H -0.217 1.217 27 C 0.025 3.975 28 C -0.157 4.157 29 C -0.034 4.034 30 H 0.105 0.895 31 H 0.061 0.939 32 H 0.059 0.941 33 H 0.082 0.918 34 H 0.070 0.930 35 H 0.081 0.919 36 H 0.083 0.917 37 H 0.094 0.906 38 H 0.094 0.906 39 H 0.110 0.890 40 H 0.080 0.920 41 H 0.090 0.910 42 H 0.087 0.913 43 H 0.081 0.919 44 H 0.066 0.934 45 H 0.039 0.961 46 H 0.106 0.894 47 H 0.062 0.938 48 H 0.045 0.955 49 H 0.071 0.929 50 H 0.077 0.923 51 H 0.091 0.909 52 H 0.088 0.912 53 H 0.116 0.884 Dipole moment (debyes) X Y Z Total from point charges -15.466 -10.110 -10.347 21.177 hybrid contribution -0.179 0.671 0.806 1.065 sum -15.645 -9.438 -9.540 20.612 Atomic orbital electron populations 1.22733 0.80734 1.02705 1.00170 1.87806 1.19865 1.27784 1.95531 1.22252 0.91527 0.84363 1.01542 1.21202 0.95111 0.94705 1.01993 0.88251 1.21712 1.01560 1.01481 0.94907 1.20346 0.80775 0.90613 0.77045 1.90697 1.61804 1.41512 1.47621 1.48087 1.18657 1.07776 1.59465 1.22629 0.93065 0.88619 1.00464 1.22376 0.91170 0.85655 0.99606 0.91218 1.21699 1.00696 0.96031 1.01467 1.88030 1.54166 1.12455 1.72779 1.21738 0.88584 0.87824 0.94027 1.22708 1.02576 1.00634 0.93963 1.20679 0.85521 0.88575 0.99780 1.44027 1.60242 1.27256 0.99921 1.19246 1.29507 0.89790 0.99172 0.91721 1.25095 0.98896 0.95697 1.00089 1.69996 1.48859 1.11146 1.25028 0.86212 0.77941 0.80581 0.81990 1.20293 1.21670 1.21736 1.20793 0.91881 0.98628 0.86214 1.21994 1.00227 0.93741 0.99736 1.22483 0.95676 0.84226 1.01022 0.89534 0.93910 0.94087 0.91839 0.93031 0.91915 0.91742 0.90565 0.90619 0.88972 0.91960 0.90950 0.91302 0.91878 0.93353 0.96128 0.89422 0.93796 0.95473 0.92936 0.92285 0.90904 0.91226 0.88375 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 17. 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 0.03 0.24 11.01 101.05 1.11 1.35 16 2 O -0.39 -3.99 10.33 -35.23 -0.36 -4.36 16 3 C 0.08 0.86 4.82 37.16 0.18 1.04 16 4 C -0.11 -1.18 2.11 -91.77 -0.19 -1.38 16 5 H 0.10 0.92 6.58 -51.93 -0.34 0.58 16 6 C -0.14 -1.44 8.79 37.15 0.33 -1.11 16 7 C 0.52 7.37 6.77 -10.98 -0.07 7.30 16 8 O -0.54 -9.42 15.73 5.56 0.09 -9.33 16 9 N -0.61 -8.24 2.52 -172.29 -0.43 -8.68 16 10 C 0.08 0.84 5.60 -3.53 -0.02 0.82 16 11 C 0.07 0.97 3.01 -26.58 -0.08 0.89 16 12 H 0.07 1.07 6.29 -51.93 -0.33 0.75 16 13 C -0.14 -1.58 9.57 37.16 0.36 -1.22 16 14 O -0.36 -6.02 8.65 -35.23 -0.30 -6.33 16 15 C 0.12 2.03 0.68 -90.50 -0.06 1.97 16 16 C -0.16 -3.17 4.33 -26.64 -0.12 -3.28 16 17 C 0.18 4.37 5.05 -3.71 -0.02 4.35 16 18 N -0.59 -15.00 2.99 -172.31 -0.52 -15.52 16 19 C -0.25 -6.85 9.60 -15.06 -0.14 -7.00 16 20 H 0.07 1.76 7.86 -52.48 -0.41 1.35 16 21 C 0.00 0.01 5.02 -17.43 -0.09 -0.08 16 22 N -0.91 -26.45 11.00 55.49 0.61 -25.84 16 23 Si 0.90 21.98 29.57 -169.99 -5.03 16.95 16 24 H -0.28 -6.61 7.11 56.52 0.40 -6.21 16 25 H -0.29 -7.09 7.11 56.52 0.40 -6.69 16 26 H -0.29 -7.11 7.11 56.52 0.40 -6.71 16 27 C 0.15 3.23 6.28 -3.71 -0.02 3.21 16 28 C -0.12 -2.06 5.10 -26.64 -0.14 -2.20 16 29 C 0.09 1.33 5.31 -3.55 -0.02 1.31 16 30 H 0.09 0.49 8.14 -51.93 -0.42 0.06 16 31 H 0.04 0.29 8.14 -51.93 -0.42 -0.13 16 32 H 0.04 0.26 8.14 -51.93 -0.42 -0.16 16 33 H 0.06 0.73 8.02 -51.93 -0.42 0.32 16 34 H 0.05 0.55 8.14 -51.93 -0.42 0.12 16 35 H 0.06 0.65 7.61 -51.93 -0.40 0.25 16 36 H 0.06 0.73 8.14 -51.93 -0.42 0.31 16 37 H 0.08 0.70 7.96 -51.93 -0.41 0.28 16 38 H 0.08 0.76 8.14 -51.93 -0.42 0.34 16 39 H 0.09 0.82 5.19 -51.93 -0.27 0.55 16 40 H 0.06 0.64 8.14 -51.93 -0.42 0.21 16 41 H 0.07 0.93 8.14 -51.93 -0.42 0.51 16 42 H 0.07 0.59 8.14 -51.93 -0.42 0.17 16 43 H 0.06 1.33 8.14 -51.93 -0.42 0.91 16 44 H 0.05 0.91 6.16 -51.93 -0.32 0.60 16 45 H 0.02 0.53 7.82 -51.93 -0.41 0.12 16 46 H 0.09 2.41 5.99 -51.93 -0.31 2.10 16 47 H 0.25 7.11 8.31 -40.82 -0.34 6.77 16 48 H 0.03 0.61 7.82 -51.92 -0.41 0.20 16 49 H 0.05 1.09 7.93 -51.93 -0.41 0.68 16 50 H 0.06 0.90 8.14 -51.93 -0.42 0.48 16 51 H 0.07 1.28 8.14 -51.93 -0.42 0.86 16 52 H 0.07 0.95 8.14 -51.93 -0.42 0.53 16 53 H 0.10 1.61 7.06 -51.93 -0.37 1.24 16 LS Contribution 401.60 15.07 6.05 6.05 Total: -1.00 -32.38 401.60 -8.32 -40.70 By element: Atomic # 1 Polarization: 9.80 SS G_CDS: -9.43 Total: 0.38 kcal Atomic # 6 Polarization: 4.97 SS G_CDS: 1.00 Total: 5.97 kcal Atomic # 7 Polarization: -49.70 SS G_CDS: -0.34 Total: -50.04 kcal Atomic # 8 Polarization: -19.43 SS G_CDS: -0.58 Total: -20.01 kcal Atomic # 14 Polarization: 21.98 SS G_CDS: -5.03 Total: 16.95 kcal Total LS contribution 6.05 Total: 6.05 kcal Total: -32.38 -8.32 -40.70 kcal The number of atoms in the molecule is 53 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. ZINC001111540912.mol2 53 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 -59.364 kcal (2) G-P(sol) polarization free energy of solvation -32.378 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -91.742 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -8.323 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -40.701 kcal (6) G-S(sol) free energy of system = (1) + (5) -100.065 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.39 seconds