Wall clock time and date at job start Sat Apr 11 2020 06:10:55 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 1.53004 * 1 3 3 O 1.42891 * 109.47114 * 2 1 4 4 C 1.42901 * 114.00296 * 180.02562 * 3 2 1 5 5 H 1.09002 * 110.64076 * 29.29718 * 4 3 2 6 6 C 1.54322 * 110.71944 * 266.15692 * 4 3 2 7 7 N 1.47018 * 107.27336 * 219.26540 * 6 4 3 8 8 C 1.34778 * 125.65052 * 178.98072 * 7 6 4 9 9 O 1.21284 * 120.00097 * 179.97438 * 8 7 6 10 10 C 1.50702 * 119.99810 * 359.96739 * 8 7 6 11 11 C 1.52998 * 109.46950 * 180.02562 * 10 8 7 12 12 H 1.08999 * 109.48111 * 55.00477 * 11 10 8 13 13 C 1.53097 * 109.48026 * 175.02489 * 11 10 8 14 14 C 1.53173 * 109.16296 * 177.59371 * 13 11 10 15 15 C 1.53180 * 109.03722 * 303.01654 * 14 13 11 16 16 C 1.53093 * 109.16043 * 56.98297 * 15 14 13 17 17 O 1.42902 * 109.48213 * 294.98137 * 11 10 8 18 18 C 1.47426 * 108.70104 * 358.94171 * 7 6 4 19 19 C 1.54909 * 104.83381 * 24.12870 * 18 7 6 20 20 H 1.08997 * 111.00194 * 81.06198 * 19 18 7 21 21 C 1.53003 * 111.00221 * 204.91626 * 19 18 7 22 22 N 1.46497 * 109.47096 * 287.19549 * 21 19 18 23 23 C 1.36936 * 119.99774 * 180.02562 * 22 21 19 24 24 H 1.08004 * 120.00133 * 0.02562 * 23 22 21 25 25 C 1.38809 * 120.00262 * 179.97438 * 23 22 21 26 26 N 1.31627 * 119.99893 * 0.02562 * 25 23 22 27 27 Si 1.86797 * 120.00631 * 179.97438 * 25 23 22 28 28 H 1.48498 * 109.46896 * 89.99500 * 27 25 23 29 29 H 1.48494 * 109.47470 * 210.00351 * 27 25 23 30 30 H 1.48501 * 109.46815 * 330.00288 * 27 25 23 31 31 H 1.09008 * 109.46977 * 180.02562 * 1 2 3 32 32 H 1.09000 * 109.46932 * 299.99354 * 1 2 3 33 33 H 1.09001 * 109.47295 * 60.00393 * 1 2 3 34 34 H 1.09007 * 109.46621 * 240.00026 * 2 1 3 35 35 H 1.08992 * 109.47380 * 120.00241 * 2 1 3 36 36 H 1.08998 * 109.88021 * 338.68244 * 6 4 3 37 37 H 1.09005 * 109.88017 * 99.68933 * 6 4 3 38 38 H 1.09003 * 109.47500 * 300.00492 * 10 8 7 39 39 H 1.09001 * 109.46727 * 60.00775 * 10 8 7 40 40 H 1.08998 * 109.51977 * 297.49850 * 13 11 10 41 41 H 1.08998 * 109.52112 * 57.62329 * 13 11 10 42 42 H 1.08994 * 109.54676 * 62.88476 * 14 13 11 43 43 H 1.09005 * 109.54319 * 183.06808 * 14 13 11 44 44 H 1.08994 * 109.52601 * 176.88590 * 15 14 13 45 45 H 1.08994 * 109.52449 * 297.01972 * 15 14 13 46 46 H 1.08997 * 109.48352 * 62.37465 * 16 15 14 47 47 H 1.09006 * 109.48322 * 182.39641 * 16 15 14 48 48 H 1.08998 * 110.36876 * 142.97187 * 18 7 6 49 49 H 1.09003 * 110.36123 * 265.28869 * 18 7 6 50 50 H 1.08999 * 109.46712 * 47.20043 * 21 19 18 51 51 H 1.08996 * 109.46823 * 167.19175 * 21 19 18 52 52 H 0.96998 * 120.00120 * 359.97438 * 22 21 19 53 53 H 0.96991 * 120.00013 * 180.02562 * 26 25 23 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 1.5300 0.0000 0.0000 3 8 2.0063 1.3472 0.0000 4 6 3.4309 1.4601 -0.0006 5 1 3.8840 0.6037 -0.5001 6 6 3.9681 1.5995 1.4394 7 7 5.0653 2.5773 1.4032 8 6 5.7840 2.9913 2.4656 9 8 6.6706 3.8056 2.3180 10 6 5.4857 2.4425 3.8371 11 6 6.4373 3.0721 4.8564 12 1 6.3656 4.1582 4.7980 13 6 6.0549 2.6102 6.2650 14 6 7.0480 3.1962 7.2732 15 6 8.4661 2.7661 6.8854 16 6 8.7554 3.2219 5.4528 17 8 7.7775 2.6669 4.5708 18 6 5.2499 3.0294 0.0122 19 6 3.8800 2.7864 -0.6689 20 1 3.1829 3.5932 -0.4432 21 6 4.0424 2.6114 -2.1802 22 7 4.3496 3.9068 -2.7916 23 6 4.5383 3.9977 -4.1448 24 1 4.4601 3.1144 -4.7615 25 6 4.8289 5.2251 -4.7242 26 7 4.9236 6.3016 -3.9728 27 14 5.0869 5.3491 -6.5701 28 1 3.7873 5.6231 -7.2343 29 1 6.0357 6.4528 -6.8644 30 1 5.6428 4.0696 -7.0792 31 1 -0.3633 -1.0277 0.0005 32 1 -0.3633 0.5137 0.8901 33 1 -0.3634 0.5138 -0.8900 34 1 1.8933 -0.5139 -0.8901 35 1 1.8934 -0.5138 0.8899 36 1 3.1758 1.9555 2.0978 37 1 4.3380 0.6366 1.7918 38 1 4.4564 2.6788 4.1071 39 1 5.6211 1.3609 3.8329 40 1 5.0488 2.9567 6.5013 41 1 6.0858 1.5217 6.3124 42 1 6.9809 4.2840 7.2612 43 1 6.8141 2.8275 8.2720 44 1 9.1844 3.2239 7.5653 45 1 8.5471 1.6809 6.9466 46 1 8.7143 4.3099 5.4023 47 1 9.7475 2.8814 5.1563 48 1 5.5028 4.0894 -0.0118 49 1 6.0267 2.4421 -0.4776 50 1 4.8554 1.9133 -2.3798 51 1 3.1165 2.2208 -2.6023 52 1 4.4187 4.7002 -2.2379 53 1 5.1263 7.1594 -4.3777 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 ZINC001479533220.mol2 53 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 06:10:55 Heat of formation + Delta-G solvation = -126.213917 kcal Electronic energy + Delta-G solvation = -30566.570284 eV Core-core repulsion = 26438.134979 eV Total energy + Delta-G solvation = -4128.435305 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.220 amu Computer time = 0.73 seconds Orbital eigenvalues (eV) -40.33444 -39.46470 -38.26616 -36.50496 -34.63810 -33.81255 -33.09070 -32.17658 -31.31040 -29.83659 -28.53776 -28.17522 -25.51166 -24.49913 -23.61493 -22.91077 -22.45524 -21.81054 -20.49570 -20.15150 -19.17487 -17.42756 -17.11502 -16.70062 -16.57323 -16.11778 -15.91154 -15.35617 -15.28654 -14.81397 -14.66929 -14.62080 -14.33238 -13.96543 -13.62849 -13.31827 -13.27790 -13.08875 -12.92125 -12.77270 -12.74602 -12.50622 -12.33888 -12.22992 -11.97708 -11.68040 -11.48989 -11.45225 -11.34418 -11.16233 -11.04716 -10.96276 -10.73375 -10.67805 -10.52893 -10.40013 -10.06032 -9.79950 -9.66885 -9.52690 -9.45154 -8.84368 -8.51399 -6.89168 -5.71896 -3.01315 2.78166 2.95328 3.47048 3.51483 3.53830 3.61793 3.62623 4.30695 4.44450 4.48485 4.54770 4.56791 4.63703 4.74758 4.85924 4.94055 4.95776 4.97713 5.03760 5.10399 5.17252 5.24099 5.25091 5.29887 5.36149 5.42219 5.43288 5.49772 5.52548 5.60932 5.62115 5.64063 5.68138 5.73266 5.74883 5.80426 5.83020 5.95404 6.00528 6.01714 6.11447 6.24655 6.36638 6.41879 6.73379 6.78080 7.14359 7.21299 7.61904 7.73251 8.31459 8.46086 9.57362 10.13955 10.48659 11.50812 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.009583 B = 0.002684 C = 0.002156 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2921.048108 B =10429.437951 C =12981.231710 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.152 4.152 2 C 0.054 3.946 3 O -0.367 6.367 4 C 0.085 3.915 5 H 0.081 0.919 6 C 0.082 3.918 7 N -0.619 5.619 8 C 0.529 3.471 9 O -0.524 6.524 10 C -0.130 4.130 11 C 0.106 3.894 12 H 0.067 0.933 13 C -0.151 4.151 14 C -0.122 4.122 15 C -0.157 4.157 16 C 0.063 3.937 17 O -0.366 6.366 18 C 0.117 3.883 19 C -0.100 4.100 20 H 0.096 0.904 21 C 0.167 3.833 22 N -0.731 5.731 23 C -0.240 4.240 24 H 0.070 0.930 25 C -0.013 4.013 26 N -0.931 5.931 27 Si 0.907 3.093 28 H -0.290 1.290 29 H -0.291 1.291 30 H -0.282 1.282 31 H 0.068 0.932 32 H 0.061 0.939 33 H 0.065 0.935 34 H 0.051 0.949 35 H 0.046 0.954 36 H 0.076 0.924 37 H 0.067 0.933 38 H 0.105 0.895 39 H 0.099 0.901 40 H 0.074 0.926 41 H 0.072 0.928 42 H 0.064 0.936 43 H 0.066 0.934 44 H 0.071 0.929 45 H 0.069 0.931 46 H 0.050 0.950 47 H 0.092 0.908 48 H 0.088 0.912 49 H 0.072 0.928 50 H 0.021 0.979 51 H 0.027 0.973 52 H 0.385 0.615 53 H 0.255 0.745 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -2.216 -14.105 23.552 27.542 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 -0.209 4.209 2 C -0.023 4.023 3 O -0.286 6.286 4 C 0.026 3.974 5 H 0.099 0.901 6 C -0.042 4.042 7 N -0.355 5.355 8 C 0.317 3.683 9 O -0.399 6.399 10 C -0.170 4.170 11 C 0.047 3.953 12 H 0.085 0.915 13 C -0.189 4.189 14 C -0.159 4.159 15 C -0.195 4.195 16 C -0.014 4.014 17 O -0.285 6.285 18 C -0.005 4.005 19 C -0.119 4.119 20 H 0.114 0.886 21 C 0.039 3.961 22 N -0.376 5.376 23 C -0.371 4.371 24 H 0.088 0.912 25 C -0.209 4.209 26 N -0.580 5.580 27 Si 0.738 3.262 28 H -0.218 1.218 29 H -0.218 1.218 30 H -0.208 1.208 31 H 0.087 0.913 32 H 0.080 0.920 33 H 0.084 0.916 34 H 0.069 0.931 35 H 0.064 0.936 36 H 0.095 0.905 37 H 0.085 0.915 38 H 0.123 0.877 39 H 0.117 0.883 40 H 0.092 0.908 41 H 0.090 0.910 42 H 0.083 0.917 43 H 0.085 0.915 44 H 0.090 0.910 45 H 0.088 0.912 46 H 0.069 0.931 47 H 0.110 0.890 48 H 0.107 0.893 49 H 0.091 0.909 50 H 0.038 0.962 51 H 0.045 0.955 52 H 0.218 0.782 53 H 0.065 0.935 Dipole moment (debyes) X Y Z Total from point charges -1.740 -13.643 23.215 26.983 hybrid contribution 0.174 0.209 -0.570 0.631 sum -1.566 -13.434 22.646 26.377 Atomic orbital electron populations 1.21741 0.93792 1.02029 1.03312 1.22539 0.95657 0.84042 1.00015 1.88004 1.19794 1.26114 1.94648 1.23089 0.81482 0.99385 0.93453 0.90111 1.22474 0.90118 0.92541 0.99110 1.48442 1.34990 1.43633 1.08465 1.20108 0.81261 0.81777 0.85164 1.90748 1.30618 1.33267 1.85252 1.21714 1.00450 1.02709 0.92094 1.21766 0.82832 0.98658 0.92008 0.91542 1.22231 0.99667 1.01819 0.95149 1.21569 0.94686 1.00910 0.98782 1.22217 0.97299 1.02121 0.97856 1.22513 0.92413 0.97856 0.88630 1.87987 1.14858 1.71184 1.54475 1.22318 0.96844 1.02059 0.79232 1.22698 0.95930 0.96405 0.96877 0.88611 1.20565 0.97624 0.90236 0.87701 1.42333 1.85405 1.04272 1.05548 1.19194 1.40338 0.93822 0.83776 0.91185 1.24751 1.02691 0.95637 0.97857 1.69664 1.55569 0.98684 1.34065 0.86186 0.77477 0.77090 0.85406 1.21751 1.21780 1.20787 0.91308 0.91975 0.91565 0.93076 0.93598 0.90533 0.91484 0.87707 0.88312 0.90768 0.90969 0.91714 0.91502 0.91030 0.91177 0.93136 0.89023 0.89339 0.90943 0.96170 0.95498 0.78157 0.93482 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 -0.15 -1.29 10.28 37.16 0.38 -0.91 16 2 C 0.05 0.52 6.51 37.16 0.24 0.76 16 3 O -0.37 -4.77 10.08 -35.23 -0.36 -5.13 16 4 C 0.09 1.09 2.89 -24.90 -0.07 1.02 16 5 H 0.08 0.94 7.75 -51.93 -0.40 0.54 16 6 C 0.08 0.91 6.26 -3.07 -0.02 0.89 16 7 N -0.62 -8.94 3.33 -170.52 -0.57 -9.51 16 8 C 0.53 8.00 7.73 -10.98 -0.08 7.92 16 9 O -0.52 -10.21 15.68 -8.84 -0.14 -10.35 16 10 C -0.13 -1.35 4.60 -27.88 -0.13 -1.48 16 11 C 0.11 1.15 2.19 -26.68 -0.06 1.09 16 12 H 0.07 0.81 7.96 -51.93 -0.41 0.40 16 13 C -0.15 -1.16 5.42 -26.59 -0.14 -1.31 16 14 C -0.12 -0.87 6.03 -26.55 -0.16 -1.03 16 15 C -0.16 -1.19 6.14 -26.59 -0.16 -1.35 16 16 C 0.06 0.63 6.84 37.21 0.25 0.89 16 17 O -0.37 -4.79 9.64 -49.63 -0.48 -5.27 16 18 C 0.12 1.99 6.32 -2.53 -0.02 1.98 16 19 C -0.10 -1.65 2.78 -88.47 -0.25 -1.89 16 20 H 0.10 1.73 8.14 -51.93 -0.42 1.31 16 21 C 0.17 3.35 5.72 -4.04 -0.02 3.32 16 22 N -0.73 -18.75 5.55 -59.91 -0.33 -19.09 16 23 C -0.24 -6.81 9.99 -15.06 -0.15 -6.96 16 24 H 0.07 1.92 7.83 -52.48 -0.41 1.51 16 25 C -0.01 -0.39 5.50 -17.43 -0.10 -0.48 16 26 N -0.93 -28.78 13.06 55.49 0.72 -28.06 16 27 Si 0.91 22.79 29.55 -169.99 -5.02 17.76 16 28 H -0.29 -7.23 7.11 56.52 0.40 -6.83 16 29 H -0.29 -7.38 7.11 56.52 0.40 -6.98 16 30 H -0.28 -6.87 7.11 56.52 0.40 -6.47 16 31 H 0.07 0.44 8.14 -51.92 -0.42 0.02 16 32 H 0.06 0.52 8.14 -51.93 -0.42 0.10 16 33 H 0.07 0.63 8.14 -51.93 -0.42 0.21 16 34 H 0.05 0.48 8.11 -51.93 -0.42 0.06 16 35 H 0.05 0.36 8.14 -51.93 -0.42 -0.07 16 36 H 0.08 0.78 8.06 -51.93 -0.42 0.36 16 37 H 0.07 0.60 8.14 -51.93 -0.42 0.17 16 38 H 0.10 0.83 8.14 -51.93 -0.42 0.40 16 39 H 0.10 0.89 8.14 -51.93 -0.42 0.46 16 40 H 0.07 0.47 8.14 -51.93 -0.42 0.04 16 41 H 0.07 0.53 8.14 -51.93 -0.42 0.11 16 42 H 0.06 0.47 8.14 -51.93 -0.42 0.05 16 43 H 0.07 0.40 8.14 -51.93 -0.42 -0.03 16 44 H 0.07 0.44 8.14 -51.93 -0.42 0.02 16 45 H 0.07 0.53 8.14 -51.93 -0.42 0.11 16 46 H 0.05 0.52 8.14 -51.93 -0.42 0.10 16 47 H 0.09 0.84 8.14 -51.93 -0.42 0.42 16 48 H 0.09 1.74 8.04 -51.93 -0.42 1.33 16 49 H 0.07 1.26 7.91 -51.93 -0.41 0.85 16 50 H 0.02 0.40 7.96 -51.93 -0.41 -0.01 16 51 H 0.03 0.55 8.14 -51.93 -0.42 0.13 16 52 H 0.38 10.46 7.67 -40.82 -0.31 10.14 16 53 H 0.26 7.63 8.31 -40.82 -0.34 7.29 16 LS Contribution 421.39 15.07 6.35 6.35 Total: -1.00 -34.86 421.39 -10.25 -45.10 By element: Atomic # 1 Polarization: 15.68 SS G_CDS: -9.94 Total: 5.74 kcal Atomic # 6 Polarization: 2.93 SS G_CDS: -0.48 Total: 2.45 kcal Atomic # 7 Polarization: -56.48 SS G_CDS: -0.17 Total: -56.65 kcal Atomic # 8 Polarization: -19.78 SS G_CDS: -0.97 Total: -20.75 kcal Atomic # 14 Polarization: 22.79 SS G_CDS: -5.02 Total: 17.76 kcal Total LS contribution 6.35 Total: 6.35 kcal Total: -34.86 -10.25 -45.10 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. ZINC001479533220.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 -81.110 kcal (2) G-P(sol) polarization free energy of solvation -34.858 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -115.969 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.245 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -45.103 kcal (6) G-S(sol) free energy of system = (1) + (5) -126.214 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.73 seconds