Wall clock time and date at job start Sat Apr 11 2020 06:12:03 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 1.42893 * 109.47080 * 2 1 4 4 C 1.42905 * 114.00079 * 179.97438 * 3 2 1 5 5 H 1.08998 * 112.92668 * 18.65933 * 4 3 2 6 6 C 1.53883 * 113.63838 * 247.31888 * 4 3 2 7 7 C 1.53882 * 87.18276 * 220.48984 * 6 4 3 8 8 H 1.08995 * 113.64326 * 139.51063 * 7 6 4 9 9 N 1.46507 * 113.64224 * 270.50224 * 7 6 4 10 10 C 1.34780 * 119.99496 * 252.31990 * 9 7 6 11 11 O 1.21581 * 120.00324 * 359.97438 * 10 9 7 12 12 N 1.34778 * 119.99508 * 179.97438 * 10 9 7 13 13 C 1.46504 * 119.99752 * 179.97438 * 12 10 9 14 14 C 1.52998 * 109.46900 * 179.97438 * 13 12 10 15 15 C 1.53001 * 109.47280 * 299.99762 * 14 13 12 16 16 C 1.52997 * 109.47408 * 60.00323 * 14 13 12 17 17 C 1.50701 * 109.46928 * 180.02562 * 14 13 12 18 18 H 1.08003 * 120.00053 * 359.97438 * 17 14 13 19 19 C 1.37879 * 119.99930 * 180.02562 * 17 14 13 20 20 N 1.31510 * 119.99928 * 359.97438 * 19 17 14 21 21 Si 1.86803 * 119.99759 * 179.97438 * 19 17 14 22 22 H 1.48502 * 109.47375 * 60.00166 * 21 19 17 23 23 H 1.48507 * 109.46983 * 180.02562 * 21 19 17 24 24 H 1.48494 * 109.47194 * 299.99577 * 21 19 17 25 25 C 1.53194 * 113.64261 * 149.99442 * 4 3 2 26 26 C 1.53852 * 114.62158 * 255.69656 * 25 4 3 27 27 C 1.55437 * 102.05129 * 151.41435 * 26 25 4 28 28 C 1.54996 * 101.00962 * 326.32753 * 27 26 25 29 29 O 1.42625 * 115.39969 * 22.52152 * 25 4 3 30 30 H 1.09002 * 109.46614 * 60.00745 * 1 2 3 31 31 H 1.08997 * 109.46913 * 180.02562 * 1 2 3 32 32 H 1.08994 * 109.47456 * 300.01037 * 1 2 3 33 33 H 1.08989 * 109.47185 * 239.99347 * 2 1 3 34 34 H 1.09002 * 109.46614 * 119.99255 * 2 1 3 35 35 H 1.08997 * 113.59999 * 335.06595 * 6 4 3 36 36 H 1.09004 * 113.59727 * 105.83799 * 6 4 3 37 37 H 0.96992 * 120.00434 * 72.31453 * 9 7 6 38 38 H 0.96997 * 120.00441 * 0.02562 * 12 10 9 39 39 H 1.08993 * 109.47122 * 300.00169 * 13 12 10 40 40 H 1.09000 * 109.46963 * 60.00273 * 13 12 10 41 41 H 1.09001 * 109.46656 * 60.00194 * 15 14 13 42 42 H 1.09001 * 109.47112 * 179.97438 * 15 14 13 43 43 H 1.09000 * 109.47566 * 300.00296 * 15 14 13 44 44 H 1.09006 * 109.46832 * 59.99418 * 16 14 13 45 45 H 1.09001 * 109.47517 * 179.97438 * 16 14 13 46 46 H 1.09001 * 109.46912 * 300.00041 * 16 14 13 47 47 H 0.97001 * 119.99669 * 180.02562 * 20 19 17 48 48 H 1.09000 * 110.91214 * 269.59918 * 26 25 4 49 49 H 1.08998 * 110.91332 * 33.22158 * 26 25 4 50 50 H 1.08991 * 111.11506 * 84.26386 * 27 26 25 51 51 H 1.09002 * 111.10704 * 208.35536 * 27 26 25 52 52 H 1.08998 * 110.30992 * 277.22104 * 28 27 26 53 53 H 1.09000 * 110.30327 * 155.07036 * 28 27 26 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 3.9295 0.5454 -0.3203 6 6 4.0025 2.0509 1.3014 7 6 4.9838 2.8441 0.4205 8 1 5.1433 3.8684 0.7570 9 7 6.2345 2.1320 0.1463 10 6 7.3789 2.5278 0.7381 11 8 7.3734 3.4760 1.4992 12 7 8.5294 1.8725 0.4862 13 6 9.7734 2.3030 1.1291 14 6 10.9210 1.3979 0.6767 15 6 10.6164 -0.0483 1.0725 16 6 11.0741 1.4894 -0.8429 17 6 12.2006 1.8404 1.3384 18 1 12.1959 2.6832 2.0138 19 6 13.3775 1.1699 1.0809 20 7 13.3833 0.1440 0.2581 21 14 14.9638 1.7189 1.9006 22 1 14.8155 1.6296 3.3755 23 1 16.0779 0.8410 1.4606 24 1 15.2592 3.1226 1.5168 25 6 3.9477 2.7200 -0.7012 26 6 4.5429 2.4767 -2.0989 27 6 4.2714 3.8331 -2.8078 28 6 2.9255 4.2429 -2.1573 29 8 3.0150 3.7951 -0.7933 30 1 -0.3632 0.5137 -0.8901 31 1 -0.3633 -1.0276 0.0005 32 1 -0.3634 0.5140 0.8898 33 1 1.8933 -0.5139 -0.8898 34 1 1.8933 -0.5137 0.8901 35 1 3.2957 2.6798 1.8426 36 1 4.4868 1.3123 1.9403 37 1 6.2390 1.3758 -0.4611 38 1 8.5339 1.1163 -0.1212 39 1 9.9902 3.3334 0.8475 40 1 9.6646 2.2374 2.2117 41 1 9.6908 -0.3686 0.5942 42 1 11.4337 -0.6932 0.7498 43 1 10.5074 -0.1135 2.1551 44 1 11.2911 2.5197 -1.1248 45 1 11.8919 0.8449 -1.1652 46 1 10.1484 1.1691 -1.3212 47 1 14.2113 -0.3279 0.0772 48 1 5.6127 2.2774 -2.0368 49 1 4.0255 1.6622 -2.6057 50 1 5.0534 4.5578 -2.5818 51 1 4.1631 3.6987 -3.8841 52 1 2.0952 3.7504 -2.6634 53 1 2.8024 5.3253 -2.1927 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 ZINC000458668981.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 06:12:03 Heat of formation + Delta-G solvation = -96.863852 kcal Electronic energy + Delta-G solvation = -31164.826243 eV Core-core repulsion = 27037.663653 eV Total energy + Delta-G solvation = -4127.162590 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.220 amu Computer time = 0.63 seconds Orbital eigenvalues (eV) -41.24996 -39.32995 -37.93573 -36.71858 -35.89870 -33.39248 -32.76316 -32.21286 -31.12287 -30.51400 -27.92752 -25.74215 -25.73690 -25.14843 -24.16501 -23.14464 -23.06570 -21.84264 -20.80398 -19.42009 -18.77542 -18.45469 -17.08057 -16.71709 -16.56506 -15.86484 -15.79071 -15.52768 -15.14976 -14.93229 -14.72651 -14.14012 -13.83501 -13.77695 -13.63483 -13.19504 -13.13610 -13.12155 -12.87742 -12.66681 -12.43136 -12.22378 -12.16534 -11.97440 -11.57405 -11.45719 -11.34728 -11.23811 -11.19910 -10.91872 -10.84004 -10.79412 -10.73050 -10.39113 -10.21693 -9.82104 -9.79961 -9.64096 -9.49503 -9.31983 -8.97882 -8.80700 -8.42236 -8.23267 -6.02668 -4.12487 2.78042 3.30171 3.34238 3.36987 3.39211 3.50379 3.66532 4.13438 4.20212 4.37620 4.39074 4.58231 4.63668 4.68236 4.73286 4.78725 4.82668 4.98321 5.00342 5.08044 5.24200 5.30764 5.37252 5.41460 5.48861 5.56698 5.60530 5.61298 5.76753 5.82602 5.83878 5.88794 5.93751 6.20141 6.35725 6.48983 6.53747 6.77869 6.79475 6.80897 6.88962 7.02078 7.06654 7.11648 7.25606 7.38673 7.54800 7.69235 8.00247 8.11445 8.36765 8.43844 8.87035 9.00130 9.53237 10.98746 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.019531 B = 0.002279 C = 0.002195 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1433.241480 B =12283.173057 C =12753.886112 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.150 4.150 2 C 0.051 3.949 3 O -0.358 6.358 4 C 0.062 3.938 5 H 0.093 0.907 6 C -0.162 4.162 7 C 0.145 3.855 8 H 0.116 0.884 9 N -0.733 5.733 10 C 0.701 3.299 11 O -0.593 6.593 12 N -0.732 5.732 13 C 0.150 3.850 14 C 0.056 3.944 15 C -0.130 4.130 16 C -0.130 4.130 17 C -0.505 4.505 18 H 0.057 0.943 19 C 0.066 3.934 20 N -0.887 5.887 21 Si 0.894 3.106 22 H -0.277 1.277 23 H -0.288 1.288 24 H -0.277 1.277 25 C 0.089 3.911 26 C -0.147 4.147 27 C -0.154 4.154 28 C 0.050 3.950 29 O -0.336 6.336 30 H 0.061 0.939 31 H 0.068 0.932 32 H 0.063 0.937 33 H 0.045 0.955 34 H 0.048 0.952 35 H 0.101 0.899 36 H 0.076 0.924 37 H 0.392 0.608 38 H 0.393 0.607 39 H 0.053 0.947 40 H 0.053 0.947 41 H 0.005 0.995 42 H 0.085 0.915 43 H 0.027 0.973 44 H 0.026 0.974 45 H 0.085 0.915 46 H 0.005 0.995 47 H 0.260 0.740 48 H 0.090 0.910 49 H 0.080 0.920 50 H 0.081 0.919 51 H 0.083 0.917 52 H 0.062 0.938 53 H 0.086 0.914 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -22.980 -0.974 -7.257 24.118 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 -0.207 4.207 2 C -0.025 4.025 3 O -0.277 6.277 4 C 0.003 3.997 5 H 0.111 0.889 6 C -0.201 4.201 7 C 0.037 3.963 8 H 0.134 0.866 9 N -0.390 5.390 10 C 0.401 3.599 11 O -0.471 6.471 12 N -0.386 5.386 13 C 0.027 3.973 14 C 0.056 3.944 15 C -0.187 4.187 16 C -0.187 4.187 17 C -0.544 4.544 18 H 0.076 0.924 19 C -0.135 4.135 20 N -0.525 5.525 21 Si 0.722 3.278 22 H -0.203 1.203 23 H -0.214 1.214 24 H -0.203 1.203 25 C 0.047 3.953 26 C -0.185 4.185 27 C -0.192 4.192 28 C -0.026 4.026 29 O -0.253 6.253 30 H 0.080 0.920 31 H 0.087 0.913 32 H 0.082 0.918 33 H 0.064 0.936 34 H 0.066 0.934 35 H 0.120 0.880 36 H 0.095 0.905 37 H 0.227 0.773 38 H 0.228 0.772 39 H 0.071 0.929 40 H 0.071 0.929 41 H 0.024 0.976 42 H 0.103 0.897 43 H 0.046 0.954 44 H 0.046 0.954 45 H 0.104 0.896 46 H 0.024 0.976 47 H 0.070 0.930 48 H 0.108 0.892 49 H 0.098 0.902 50 H 0.100 0.900 51 H 0.102 0.898 52 H 0.080 0.920 53 H 0.105 0.895 Dipole moment (debyes) X Y Z Total from point charges -23.039 0.031 -6.442 23.922 hybrid contribution 1.125 -0.845 -0.355 1.451 sum -21.913 -0.814 -6.797 22.958 Atomic orbital electron populations 1.21725 0.93810 1.02059 1.03136 1.22543 0.95697 0.84406 0.99886 1.88059 1.19680 1.25473 1.94448 1.24214 0.81986 0.96718 0.96786 0.88940 1.23964 0.98431 1.00618 0.97127 1.21588 0.81970 0.98269 0.94471 0.86584 1.44810 1.06594 1.36228 1.51403 1.16015 0.80236 0.82788 0.80906 1.90897 1.85556 1.30295 1.40352 1.45510 1.07464 1.35206 1.50409 1.21603 0.81019 0.98655 0.95987 1.18358 0.91368 0.91483 0.93234 1.21822 0.98741 0.99870 0.98315 1.21821 0.99339 1.00313 0.97266 1.20947 0.91763 1.14925 1.26748 0.92446 1.24877 0.98816 0.94833 0.95000 1.69792 1.27054 1.20265 1.35425 0.86628 0.82741 0.78573 0.79882 1.20267 1.21363 1.20277 1.23386 0.89548 0.87736 0.94649 1.23056 1.02691 0.98522 0.94240 1.23262 0.98042 0.97118 1.00737 1.23487 0.96860 0.99945 0.82299 1.88364 1.60710 1.49399 1.26840 0.91957 0.91277 0.91806 0.93623 0.93397 0.88021 0.90499 0.77335 0.77240 0.92888 0.92882 0.97613 0.89651 0.95429 0.95444 0.89646 0.97606 0.92977 0.89160 0.90173 0.90026 0.89836 0.91996 0.89549 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 12. 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 -1.04 10.28 37.16 0.38 -0.66 16 2 C 0.05 0.42 6.50 37.16 0.24 0.66 16 3 O -0.36 -3.96 10.02 -49.20 -0.49 -4.45 16 4 C 0.06 0.63 3.76 -26.17 -0.10 0.53 16 5 H 0.09 0.77 7.86 -51.93 -0.41 0.36 16 6 C -0.16 -1.88 7.71 -25.81 -0.20 -2.08 16 7 C 0.14 1.82 4.08 -67.36 -0.27 1.55 16 8 H 0.12 1.77 7.46 -51.93 -0.39 1.38 16 9 N -0.73 -9.29 4.40 -58.12 -0.26 -9.55 16 10 C 0.70 12.16 8.57 -86.91 -0.74 11.41 16 11 O -0.59 -12.80 15.94 5.29 0.08 -12.72 16 12 N -0.73 -12.74 4.96 -65.23 -0.32 -13.06 16 13 C 0.15 3.18 4.50 -4.04 -0.02 3.16 16 14 C 0.06 1.29 0.50 -155.66 -0.08 1.21 16 15 C -0.13 -2.87 8.08 37.16 0.30 -2.57 16 16 C -0.13 -2.86 8.08 37.16 0.30 -2.56 16 17 C -0.51 -13.12 8.01 -34.44 -0.28 -13.40 16 18 H 0.06 1.51 7.74 -52.48 -0.41 1.10 16 19 C 0.07 1.72 5.15 -17.82 -0.09 1.63 16 20 N -0.89 -23.39 9.35 55.43 0.52 -22.87 16 21 Si 0.89 20.64 29.54 -169.99 -5.02 15.62 16 22 H -0.28 -6.41 7.11 56.52 0.40 -6.01 16 23 H -0.29 -6.61 7.11 56.52 0.40 -6.21 16 24 H -0.28 -6.41 7.11 56.52 0.40 -6.01 16 25 C 0.09 0.95 1.40 -89.97 -0.13 0.83 16 26 C -0.15 -1.28 6.06 -24.99 -0.15 -1.43 16 27 C -0.15 -1.26 7.16 -24.38 -0.17 -1.44 16 28 C 0.05 0.46 7.79 38.21 0.30 0.75 16 29 O -0.34 -4.09 10.77 -49.20 -0.53 -4.62 16 30 H 0.06 0.44 8.14 -51.93 -0.42 0.02 16 31 H 0.07 0.36 8.14 -51.93 -0.42 -0.07 16 32 H 0.06 0.47 8.14 -51.93 -0.42 0.05 16 33 H 0.05 0.32 8.14 -51.94 -0.42 -0.10 16 34 H 0.05 0.37 8.14 -51.93 -0.42 -0.05 16 35 H 0.10 1.24 8.14 -51.93 -0.42 0.81 16 36 H 0.08 0.89 8.14 -51.93 -0.42 0.47 16 37 H 0.39 3.85 7.47 -40.82 -0.31 3.55 16 38 H 0.39 6.04 6.18 -40.82 -0.25 5.79 16 39 H 0.05 1.19 8.14 -51.93 -0.42 0.76 16 40 H 0.05 1.19 8.14 -51.93 -0.42 0.77 16 41 H 0.00 0.10 6.86 -51.93 -0.36 -0.26 16 42 H 0.08 2.09 6.07 -51.93 -0.32 1.78 16 43 H 0.03 0.61 8.14 -51.93 -0.42 0.18 16 44 H 0.03 0.60 8.14 -51.93 -0.42 0.18 16 45 H 0.08 2.09 6.07 -51.93 -0.32 1.78 16 46 H 0.00 0.10 6.86 -51.93 -0.36 -0.26 16 47 H 0.26 6.66 8.31 -40.82 -0.34 6.32 16 48 H 0.09 0.78 6.15 -51.93 -0.32 0.46 16 49 H 0.08 0.60 8.10 -51.93 -0.42 0.18 16 50 H 0.08 0.74 8.14 -51.93 -0.42 0.32 16 51 H 0.08 0.54 8.14 -51.93 -0.42 0.11 16 52 H 0.06 0.51 8.14 -51.93 -0.42 0.08 16 53 H 0.09 0.68 8.14 -51.93 -0.42 0.26 16 LS Contribution 411.20 15.07 6.20 6.20 Total: -1.00 -30.27 411.20 -9.85 -40.13 By element: Atomic # 1 Polarization: 17.06 SS G_CDS: -9.32 Total: 7.74 kcal Atomic # 6 Polarization: -1.71 SS G_CDS: -0.71 Total: -2.42 kcal Atomic # 7 Polarization: -45.42 SS G_CDS: -0.06 Total: -45.48 kcal Atomic # 8 Polarization: -20.85 SS G_CDS: -0.94 Total: -21.79 kcal Atomic # 14 Polarization: 20.64 SS G_CDS: -5.02 Total: 15.62 kcal Total LS contribution 6.20 Total: 6.20 kcal Total: -30.27 -9.85 -40.13 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. ZINC000458668981.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 -56.737 kcal (2) G-P(sol) polarization free energy of solvation -30.272 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -87.009 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -9.854 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -40.127 kcal (6) G-S(sol) free energy of system = (1) + (5) -96.864 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.63 seconds