Wall clock time and date at job start Tue Mar 31 2020 23:20:25 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 1.45196 * 1 3 3 C 1.34230 * 116.99862 * 2 1 4 4 O 1.20833 * 120.00176 * 359.97438 * 3 2 1 5 5 C 1.50694 * 120.00486 * 179.97438 * 3 2 1 6 6 C 1.52999 * 109.47568 * 179.97438 * 5 3 2 7 7 N 1.46497 * 109.47027 * 181.16998 * 6 5 3 8 8 C 1.36937 * 120.00061 * 92.21058 * 7 6 5 9 9 H 1.08000 * 120.00077 * 322.70618 * 8 7 6 10 10 C 1.38810 * 120.00287 * 142.70510 * 8 7 6 11 11 N 1.31618 * 120.00491 * 157.11534 * 10 8 7 12 12 Si 1.86803 * 120.00159 * 337.12169 * 10 8 7 13 13 H 1.48502 * 109.47377 * 95.39300 * 12 10 8 14 14 H 1.48500 * 109.47352 * 215.39686 * 12 10 8 15 15 H 1.48507 * 109.46751 * 335.39385 * 12 10 8 16 16 C 1.46499 * 120.00173 * 272.20568 * 7 6 5 17 17 C 1.50699 * 109.47018 * 90.00233 * 16 7 6 18 18 O 1.21277 * 120.00469 * 359.97438 * 17 16 7 19 19 N 1.34782 * 120.00084 * 180.02562 * 17 16 7 20 20 C 1.46501 * 120.00037 * 359.97438 * 19 17 16 21 21 C 1.46501 * 120.00188 * 180.02562 * 19 17 16 22 22 H 1.09002 * 109.47048 * 359.97438 * 21 19 17 23 23 C 1.52998 * 109.47115 * 239.99814 * 21 19 17 24 24 C 1.52997 * 109.47205 * 179.97438 * 23 21 19 25 25 C 1.52996 * 109.47133 * 59.99803 * 24 23 21 26 26 C 1.52998 * 109.47236 * 300.00178 * 25 24 23 27 27 C 1.52996 * 109.47363 * 119.99531 * 21 19 17 28 28 H 1.09002 * 109.47166 * 59.99916 * 27 21 19 29 29 C 1.52998 * 109.47236 * 300.00209 * 27 21 19 30 30 H 1.09000 * 109.47496 * 60.00154 * 1 2 3 31 31 H 1.09004 * 109.46879 * 180.02562 * 1 2 3 32 32 H 1.09005 * 109.47590 * 300.00058 * 1 2 3 33 33 H 1.09002 * 109.46620 * 59.99744 * 5 3 2 34 34 H 1.09003 * 109.47092 * 300.00407 * 5 3 2 35 35 H 1.08995 * 109.47453 * 301.16854 * 6 5 3 36 36 H 1.09004 * 109.46762 * 61.17365 * 6 5 3 37 37 H 0.96996 * 120.01003 * 180.02562 * 11 10 8 38 38 H 1.09003 * 109.47434 * 210.00079 * 16 7 6 39 39 H 1.09005 * 109.47305 * 330.00238 * 16 7 6 40 40 H 1.09003 * 109.46734 * 90.00327 * 20 19 17 41 41 H 1.08991 * 109.47392 * 210.00353 * 20 19 17 42 42 H 1.08999 * 109.47121 * 330.00745 * 20 19 17 43 43 H 1.09002 * 109.46804 * 299.99711 * 23 21 19 44 44 H 1.09007 * 109.47295 * 59.99598 * 23 21 19 45 45 H 1.09002 * 109.47188 * 299.99702 * 24 23 21 46 46 H 1.09000 * 109.47100 * 179.97438 * 24 23 21 47 47 H 1.09005 * 109.47270 * 179.97438 * 25 24 23 48 48 H 1.09009 * 109.46915 * 60.00233 * 25 24 23 49 49 H 1.09000 * 109.46852 * 299.99395 * 26 25 24 50 50 H 1.09004 * 109.46816 * 179.97438 * 26 25 24 51 51 H 1.08998 * 109.47648 * 59.99904 * 29 27 21 52 52 H 1.09007 * 109.47295 * 180.02562 * 29 27 21 53 53 H 1.09002 * 109.46804 * 299.99929 * 29 27 21 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 1.4520 0.0000 0.0000 3 6 2.0613 1.1960 0.0000 4 8 1.4032 2.2094 -0.0005 5 6 3.5662 1.2750 0.0006 6 6 3.9999 2.7423 -0.0002 7 7 5.4626 2.8190 -0.0278 8 6 6.1212 2.9067 -1.2252 9 1 5.7588 2.3583 -2.0822 10 6 7.2545 3.7003 -1.3377 11 7 8.1332 3.4621 -2.2882 12 14 7.5327 5.1064 -0.1398 13 1 8.4074 4.6466 0.9687 14 1 8.1838 6.2380 -0.8473 15 1 6.2279 5.5524 0.4116 16 6 6.2209 2.8021 1.2256 17 6 6.5541 1.3788 1.5919 18 8 6.1933 0.4682 0.8768 19 7 7.2522 1.1177 2.7149 20 6 7.6875 2.2177 3.5791 21 6 7.5766 -0.2659 3.0708 22 1 7.1734 -0.9396 2.3146 23 6 6.9615 -0.6002 4.4312 24 6 7.2998 -2.0453 4.8025 25 6 8.8190 -2.2110 4.8752 26 6 9.4341 -1.8767 3.5148 27 6 9.0959 -0.4310 3.1436 28 1 9.4988 0.2427 3.8999 29 6 9.7110 -0.0966 1.7832 30 1 -0.3634 0.5138 -0.8900 31 1 -0.3633 -1.0277 0.0005 32 1 -0.3634 0.5138 0.8900 33 1 3.9562 0.7807 -0.8892 34 1 3.9556 0.7811 0.8908 35 1 3.5933 3.2409 -0.8799 36 1 3.6274 3.2317 0.8997 37 1 8.9253 4.0163 -2.3666 38 1 7.1426 3.3703 1.1004 39 1 5.6223 3.2508 2.0184 40 1 6.9176 2.4216 4.3233 41 1 8.6140 1.9401 4.0817 42 1 7.8548 3.1097 2.9755 43 1 7.3644 0.0735 5.1875 44 1 5.8790 -0.4826 4.3793 45 1 6.8966 -2.7188 4.0462 46 1 6.8619 -2.2834 5.7719 47 1 9.0600 -3.2405 5.1402 48 1 9.2222 -1.5376 5.6316 49 1 9.0310 -2.5501 2.7584 50 1 10.5165 -1.9943 3.5667 51 1 9.4697 0.9328 1.5183 52 1 10.7934 -0.2147 1.8349 53 1 9.3081 -0.7703 1.0269 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 ZINC000879474332.mol2 53 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Tue Mar 31 2020 23:20:25 Heat of formation + Delta-G solvation = -108.076195 kcal Electronic energy + Delta-G solvation = -32258.179500 eV Core-core repulsion = 28130.530706 eV Total energy + Delta-G solvation = -4127.648794 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.220 amu Computer time = 1.28 seconds Orbital eigenvalues (eV) -40.13516 -39.96496 -38.05889 -36.37786 -35.53941 -34.56664 -32.45909 -32.11669 -30.88932 -29.95102 -27.74685 -26.95733 -26.70410 -25.72930 -24.50331 -22.59666 -21.46373 -21.14785 -19.96740 -19.68096 -18.90106 -17.29650 -16.85298 -16.66818 -16.25860 -16.13952 -15.78144 -15.53019 -14.76267 -14.53090 -14.45445 -14.12639 -14.10130 -13.74379 -13.23933 -13.14203 -12.96871 -12.77362 -12.71497 -12.59449 -12.31588 -12.18246 -12.17046 -12.01666 -11.89471 -11.81029 -11.51811 -11.46846 -11.13564 -11.08981 -10.89645 -10.72680 -10.60208 -10.45125 -10.29277 -10.27302 -10.17464 -10.11161 -10.03499 -9.68253 -9.07231 -8.55843 -8.15711 -6.97611 -6.04743 -3.47001 2.59984 3.06936 3.15876 3.33051 3.39402 3.44284 3.47657 4.42931 4.60236 4.73163 4.79437 4.87254 5.03829 5.14120 5.18526 5.20675 5.24714 5.26363 5.36479 5.40549 5.43262 5.45839 5.49310 5.52443 5.61444 5.63552 5.66222 5.77264 5.84230 5.86576 5.89158 5.94438 5.95941 6.00785 6.04515 6.11820 6.16582 6.18022 6.21678 6.30971 6.33213 6.46685 6.56396 6.61705 6.67818 6.90585 7.01812 7.81897 8.00467 8.11109 8.34076 8.81166 9.00661 9.62169 9.97954 11.10322 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.007809 B = 0.004874 C = 0.003347 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 3584.638819 B = 5743.950372 C = 8363.485658 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.034 3.966 2 O -0.364 6.364 3 C 0.463 3.537 4 O -0.518 6.518 5 C -0.128 4.128 6 C 0.165 3.835 7 N -0.576 5.576 8 C -0.263 4.263 9 H 0.082 0.918 10 C 0.038 3.962 11 N -0.890 5.890 12 Si 0.865 3.135 13 H -0.286 1.286 14 H -0.297 1.297 15 H -0.264 1.264 16 C 0.115 3.885 17 C 0.490 3.510 18 O -0.515 6.515 19 N -0.623 5.623 20 C 0.079 3.921 21 C 0.145 3.855 22 H 0.099 0.901 23 C -0.125 4.125 24 C -0.116 4.116 25 C -0.119 4.119 26 C -0.112 4.112 27 C -0.098 4.098 28 H 0.068 0.932 29 C -0.143 4.143 30 H 0.059 0.941 31 H 0.095 0.905 32 H 0.058 0.942 33 H 0.108 0.892 34 H 0.102 0.898 35 H 0.072 0.928 36 H 0.045 0.955 37 H 0.264 0.736 38 H 0.083 0.917 39 H 0.069 0.931 40 H 0.050 0.950 41 H 0.066 0.934 42 H 0.069 0.931 43 H 0.061 0.939 44 H 0.063 0.937 45 H 0.064 0.936 46 H 0.060 0.940 47 H 0.060 0.940 48 H 0.059 0.941 49 H 0.064 0.936 50 H 0.062 0.938 51 H 0.059 0.941 52 H 0.048 0.952 53 H 0.056 0.944 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -2.312 -8.461 15.561 17.863 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 -0.060 4.060 2 O -0.281 6.281 3 C 0.306 3.694 4 O -0.406 6.406 5 C -0.168 4.168 6 C 0.039 3.961 7 N -0.295 5.295 8 C -0.392 4.392 9 H 0.099 0.901 10 C -0.163 4.163 11 N -0.530 5.530 12 Si 0.695 3.305 13 H -0.214 1.214 14 H -0.224 1.224 15 H -0.189 1.189 16 C -0.015 4.015 17 C 0.277 3.723 18 O -0.389 6.389 19 N -0.360 5.360 20 C -0.065 4.065 21 C 0.041 3.959 22 H 0.117 0.883 23 C -0.164 4.164 24 C -0.154 4.154 25 C -0.156 4.156 26 C -0.150 4.150 27 C -0.117 4.117 28 H 0.086 0.914 29 C -0.200 4.200 30 H 0.078 0.922 31 H 0.113 0.887 32 H 0.077 0.923 33 H 0.126 0.874 34 H 0.120 0.880 35 H 0.090 0.910 36 H 0.063 0.937 37 H 0.074 0.926 38 H 0.100 0.900 39 H 0.087 0.913 40 H 0.069 0.931 41 H 0.085 0.915 42 H 0.088 0.912 43 H 0.080 0.920 44 H 0.082 0.918 45 H 0.082 0.918 46 H 0.079 0.921 47 H 0.078 0.922 48 H 0.078 0.922 49 H 0.083 0.917 50 H 0.080 0.920 51 H 0.078 0.922 52 H 0.067 0.933 53 H 0.075 0.925 Dipole moment (debyes) X Y Z Total from point charges -2.616 -8.547 14.984 17.448 hybrid contribution 0.290 0.780 0.740 1.114 sum -2.326 -7.767 15.724 17.691 Atomic orbital electron populations 1.23162 0.77602 1.03042 1.02170 1.86589 1.22570 1.34581 1.84384 1.24574 0.92904 0.80730 0.71155 1.90613 1.67601 1.36331 1.46101 1.22338 0.84014 1.03967 1.06513 1.20702 0.83520 0.90740 1.01165 1.43804 1.00160 1.83602 1.01888 1.18734 1.09080 1.23107 0.88255 0.90051 1.25420 0.96655 0.97761 0.96460 1.69888 1.09761 1.38597 1.34775 0.87117 0.78190 0.84417 0.80784 1.21400 1.22415 1.18867 1.21462 0.98025 0.91721 0.90285 1.22757 0.76557 0.94195 0.78840 1.90582 1.51896 1.47152 1.49256 1.48232 1.56965 1.05975 1.24813 1.21689 0.99599 0.90381 0.94851 1.21004 0.93821 0.84441 0.96671 0.88300 1.21865 1.00831 0.96525 0.97133 1.21493 0.96005 0.96642 1.01285 1.21550 0.95583 1.01012 0.97501 1.21581 1.00276 0.96169 0.96971 1.21454 0.95527 0.96592 0.98172 0.91411 1.21745 0.99430 1.02665 0.96188 0.92174 0.88674 0.92340 0.87354 0.87988 0.91001 0.93700 0.92624 0.89951 0.91276 0.93135 0.91534 0.91247 0.92017 0.91827 0.91773 0.92086 0.92173 0.92187 0.91715 0.91958 0.92209 0.93270 0.92451 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 0.40 10.56 101.05 1.07 1.47 16 2 O -0.36 -5.81 10.57 -39.26 -0.41 -6.23 16 3 C 0.46 8.26 7.96 36.00 0.29 8.54 16 4 O -0.52 -10.09 15.73 -18.76 -0.29 -10.39 16 5 C -0.13 -2.43 5.26 -27.89 -0.15 -2.58 16 6 C 0.17 3.40 5.01 -4.04 -0.02 3.38 16 7 N -0.58 -13.40 1.64 -174.61 -0.29 -13.69 16 8 C -0.26 -7.22 9.90 -15.06 -0.15 -7.37 16 9 H 0.08 2.45 8.06 -52.49 -0.42 2.03 16 10 C 0.04 1.06 5.30 -17.43 -0.09 0.97 16 11 N -0.89 -26.58 13.97 55.49 0.78 -25.81 16 12 Si 0.87 20.76 25.07 -169.99 -4.26 16.50 16 13 H -0.29 -6.40 6.66 56.52 0.38 -6.02 16 14 H -0.30 -7.31 7.11 56.52 0.40 -6.91 16 15 H -0.26 -6.16 7.11 56.52 0.40 -5.76 16 16 C 0.12 2.37 3.59 -5.19 -0.02 2.35 16 17 C 0.49 9.69 7.59 -10.98 -0.08 9.61 16 18 O -0.52 -11.69 13.36 5.56 0.07 -11.62 16 19 N -0.62 -9.76 2.00 -173.94 -0.35 -10.11 16 20 C 0.08 0.99 9.30 59.85 0.56 1.55 16 21 C 0.14 2.01 1.97 -67.93 -0.13 1.87 16 22 H 0.10 1.65 6.90 -51.93 -0.36 1.29 16 23 C -0.13 -1.40 5.20 -26.73 -0.14 -1.54 16 24 C -0.12 -1.11 5.92 -26.73 -0.16 -1.27 16 25 C -0.12 -1.06 5.92 -26.73 -0.16 -1.22 16 26 C -0.11 -1.16 5.21 -26.71 -0.14 -1.30 16 27 C -0.10 -1.21 2.09 -90.60 -0.19 -1.40 16 28 H 0.07 0.78 6.66 -51.93 -0.35 0.44 16 29 C -0.14 -2.13 9.04 37.16 0.34 -1.79 16 30 H 0.06 0.70 8.13 -51.93 -0.42 0.27 16 31 H 0.09 0.82 8.14 -51.93 -0.42 0.39 16 32 H 0.06 0.66 8.13 -51.93 -0.42 0.23 16 33 H 0.11 2.22 8.14 -51.93 -0.42 1.79 16 34 H 0.10 1.96 6.48 -51.93 -0.34 1.62 16 35 H 0.07 1.54 7.95 -51.93 -0.41 1.13 16 36 H 0.04 0.86 7.90 -51.93 -0.41 0.45 16 37 H 0.26 7.45 8.31 -40.82 -0.34 7.11 16 38 H 0.08 1.82 2.53 -51.93 -0.13 1.68 16 39 H 0.07 1.22 7.88 -51.93 -0.41 0.81 16 40 H 0.05 0.54 8.14 -51.93 -0.42 0.11 16 41 H 0.07 0.71 6.42 -51.93 -0.33 0.38 16 42 H 0.07 0.95 6.44 -51.93 -0.33 0.62 16 43 H 0.06 0.63 7.67 -51.93 -0.40 0.23 16 44 H 0.06 0.77 8.14 -51.93 -0.42 0.34 16 45 H 0.06 0.65 8.14 -51.93 -0.42 0.23 16 46 H 0.06 0.51 8.14 -51.93 -0.42 0.09 16 47 H 0.06 0.48 8.14 -51.93 -0.42 0.05 16 48 H 0.06 0.51 8.14 -51.92 -0.42 0.09 16 49 H 0.06 0.72 8.14 -51.93 -0.42 0.29 16 50 H 0.06 0.60 8.14 -51.93 -0.42 0.17 16 51 H 0.06 1.05 7.60 -51.93 -0.39 0.65 16 52 H 0.05 0.64 8.14 -51.93 -0.42 0.22 16 53 H 0.06 0.94 8.14 -51.93 -0.42 0.52 16 LS Contribution 407.81 15.07 6.15 6.15 Total: -1.00 -32.21 407.81 -7.16 -39.37 By element: Atomic # 1 Polarization: 13.92 SS G_CDS: -9.37 Total: 4.55 kcal Atomic # 6 Polarization: 10.45 SS G_CDS: 0.82 Total: 11.27 kcal Atomic # 7 Polarization: -49.75 SS G_CDS: 0.14 Total: -49.61 kcal Atomic # 8 Polarization: -27.59 SS G_CDS: -0.64 Total: -28.23 kcal Atomic # 14 Polarization: 20.76 SS G_CDS: -4.26 Total: 16.50 kcal Total LS contribution 6.15 Total: 6.15 kcal Total: -32.21 -7.16 -39.37 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. ZINC000879474332.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 -68.706 kcal (2) G-P(sol) polarization free energy of solvation -32.209 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -100.915 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -7.161 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -39.370 kcal (6) G-S(sol) free energy of system = (1) + (5) -108.076 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.28 seconds