Wall clock time and date at job start Sat Apr 11 2020 04:53:56 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 1.52999 * 1 3 3 N 1.46502 * 109.46997 * 2 1 4 4 C 1.36742 * 127.14415 * 269.97984 * 3 2 1 5 5 C 1.50703 * 126.34244 * 0.05510 * 4 3 2 6 6 C 1.53000 * 109.47044 * 90.00060 * 5 4 3 7 7 C 1.50703 * 109.46758 * 179.97438 * 6 5 4 8 8 H 1.07999 * 120.00477 * 0.02562 * 7 6 5 9 9 C 1.37879 * 119.99985 * 179.97438 * 7 6 5 10 10 N 1.31512 * 119.99717 * 0.02562 * 9 7 6 11 11 Si 1.86797 * 120.00186 * 180.02562 * 9 7 6 12 12 H 1.48503 * 109.47124 * 359.97438 * 11 9 7 13 13 H 1.48501 * 109.47203 * 120.00015 * 11 9 7 14 14 H 1.48497 * 109.47309 * 240.00326 * 11 9 7 15 15 N 1.30291 * 107.30564 * 180.02562 * 4 3 2 16 16 N 1.28523 * 110.05629 * 359.72787 * 15 4 3 17 17 C 1.31221 * 109.85944 * 0.44970 * 16 15 4 18 18 N 1.38579 * 126.46928 * 179.82111 * 17 16 15 19 19 C 1.48535 * 110.99746 * 117.09004 * 18 17 16 20 20 C 1.54930 * 103.22748 * 200.27587 * 19 18 17 21 21 C 1.54596 * 102.92163 * 37.41562 * 20 19 18 22 22 H 1.08998 * 110.39622 * 96.99914 * 21 20 19 23 23 O 1.42902 * 110.31025 * 219.12508 * 21 20 19 24 24 C 1.42900 * 114.00241 * 265.71745 * 23 21 20 25 25 C 1.52992 * 109.47498 * 179.97438 * 24 23 21 26 26 C 1.52997 * 109.47482 * 174.99804 * 25 24 23 27 27 C 1.52999 * 109.46961 * 295.00164 * 25 24 23 28 28 C 1.47900 * 111.00268 * 359.69544 * 18 17 16 29 29 H 1.09002 * 109.46879 * 299.99705 * 1 2 3 30 30 H 1.09002 * 109.47073 * 59.99835 * 1 2 3 31 31 H 1.09004 * 109.46912 * 179.97438 * 1 2 3 32 32 H 1.09000 * 109.47220 * 240.00988 * 2 1 3 33 33 H 1.08994 * 109.47650 * 120.00402 * 2 1 3 34 34 H 1.08999 * 109.46867 * 210.00032 * 5 4 3 35 35 H 1.09002 * 109.46898 * 330.00012 * 5 4 3 36 36 H 1.08999 * 109.47265 * 299.99728 * 6 5 4 37 37 H 1.08993 * 109.47169 * 60.00157 * 6 5 4 38 38 H 0.97003 * 120.00035 * 180.02562 * 10 9 7 39 39 H 1.09002 * 110.66750 * 318.71644 * 19 18 17 40 40 H 1.09005 * 110.66904 * 81.67155 * 19 18 17 41 41 H 1.08994 * 110.72936 * 279.05606 * 20 19 18 42 42 H 1.09006 * 110.72441 * 155.76784 * 20 19 18 43 43 H 1.09001 * 109.47144 * 59.99409 * 24 23 21 44 44 H 1.09002 * 109.46699 * 299.99648 * 24 23 21 45 45 H 1.09002 * 109.47103 * 54.99557 * 25 24 23 46 46 H 1.09002 * 109.47153 * 59.99783 * 26 25 24 47 47 H 1.09001 * 109.46832 * 299.99974 * 26 25 24 48 48 H 1.09004 * 109.47261 * 179.97438 * 26 25 24 49 49 H 1.09002 * 109.46716 * 299.99630 * 27 25 24 50 50 H 1.09000 * 109.47486 * 59.99547 * 27 25 24 51 51 H 1.09001 * 109.47362 * 180.02562 * 27 25 24 52 52 H 1.08998 * 109.91576 * 26.48471 * 28 18 17 53 53 H 1.08999 * 110.07713 * 265.28415 * 28 18 17 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 7 2.0183 1.3812 0.0000 4 6 2.2939 2.1596 -1.0900 5 6 2.1505 1.7559 -2.5349 6 6 0.7423 2.1012 -3.0235 7 6 0.5992 1.6981 -4.4685 8 1 1.4293 1.2410 -4.9865 9 6 -0.5920 1.9119 -5.1292 10 7 -1.6031 2.4681 -4.4983 11 14 -0.7697 1.4117 -6.9201 12 1 0.5033 0.8124 -7.3953 13 1 -1.8645 0.4168 -7.0499 14 1 -1.0888 2.6086 -7.7391 15 7 2.7028 3.3150 -0.6478 16 7 2.6989 3.3215 0.6374 17 6 2.2930 2.1578 1.0879 18 7 2.1624 1.7892 2.4173 19 6 0.7474 1.4813 2.7478 20 6 0.7060 1.6172 4.2906 21 6 1.6479 2.8136 4.5576 22 1 1.0726 3.7327 4.6684 23 8 2.4318 2.5760 5.7286 24 6 1.8741 3.1273 6.9232 25 6 2.7914 2.8133 8.1066 26 6 2.2604 3.5080 9.3621 27 6 2.8271 1.3012 8.3369 28 6 2.5543 2.8970 3.3155 29 1 -0.3633 0.5138 0.8900 30 1 -0.3633 0.5139 -0.8900 31 1 -0.3633 -1.0277 -0.0005 32 1 1.8933 -0.5137 -0.8901 33 1 1.8934 -0.5138 0.8899 34 1 2.8852 2.2913 -3.1363 35 1 2.3153 0.6827 -2.6303 36 1 0.0076 1.5659 -2.4221 37 1 0.5776 3.1744 -2.9280 38 1 -2.4413 2.6182 -4.9630 39 1 0.0774 2.2025 2.2799 40 1 0.4928 0.4666 2.4414 41 1 1.0854 0.7137 4.7678 42 1 -0.3054 1.8391 4.6313 43 1 0.8910 2.6910 7.1002 44 1 1.7779 4.2076 6.8143 45 1 3.7980 3.1718 7.8912 46 1 1.2538 3.1495 9.5775 47 1 2.2350 4.5853 9.1979 48 1 2.9138 3.2839 10.2053 49 1 1.8206 0.9426 8.5524 50 1 3.2055 0.8062 7.4425 51 1 3.4804 1.0774 9.1803 52 1 2.4078 3.8526 2.8122 53 1 3.5983 2.7887 3.6097 RHF calculation, no. of doubly occupied orbitals= 65 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 ZINC001356486015.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 04:53:56 Heat of formation + Delta-G solvation = 22.592753 kcal Electronic energy + Delta-G solvation = -29764.658910 eV Core-core repulsion = 25865.425150 eV Total energy + Delta-G solvation = -3899.233761 eV No. of doubly occupied orbitals = 65 Molecular weight (most abundant/longest-lived isotopes) = 336.227 amu Computer time = 0.84 seconds Orbital eigenvalues (eV) -42.62908 -39.69396 -37.77994 -35.60159 -35.22772 -33.97457 -32.18101 -31.16744 -30.18423 -28.98687 -28.02336 -27.50608 -26.14397 -25.27929 -23.85051 -22.87484 -22.06632 -21.25152 -20.64427 -20.21664 -19.55682 -17.64312 -17.32037 -16.60551 -16.26415 -15.82940 -15.56727 -15.19655 -14.97736 -14.51827 -14.43814 -14.34308 -13.86940 -13.56592 -13.28172 -13.11500 -13.01802 -12.91325 -12.69408 -12.61837 -12.55452 -12.34822 -12.15175 -11.92729 -11.76818 -11.38500 -11.32461 -11.26700 -11.19981 -11.05173 -11.00558 -10.96361 -10.83965 -10.66835 -10.26529 -10.02981 -9.89941 -9.81074 -9.76378 -9.31432 -9.18447 -8.42695 -7.95219 -6.07698 -4.11271 2.11285 2.55147 3.26744 3.27104 3.28683 3.35422 3.39109 3.77433 4.22909 4.31017 4.39617 4.49439 4.52074 4.68418 4.74236 4.81001 4.93931 5.01113 5.07034 5.08553 5.12467 5.16544 5.20571 5.25475 5.27906 5.28600 5.34970 5.38040 5.48835 5.49787 5.56358 5.58454 5.64022 5.67413 5.71481 5.71758 5.80862 5.89967 5.93361 6.00032 6.16544 6.31330 6.38038 6.47515 6.55051 6.68300 6.92225 6.98169 7.44731 7.56566 7.68172 7.90434 8.28084 8.94990 9.22449 9.53317 11.03351 Molecular weight = 336.23amu Principal moments of inertia in cm(-1) A = 0.028389 B = 0.002048 C = 0.002019 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 986.050359 B =13665.848398 C =13868.243464 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.183 4.183 2 C 0.108 3.892 3 N -0.475 5.475 4 C 0.213 3.787 5 C -0.031 4.031 6 C 0.031 3.969 7 C -0.522 4.522 8 H 0.059 0.941 9 C 0.059 3.941 10 N -0.892 5.892 11 Si 0.894 3.106 12 H -0.272 1.272 13 H -0.284 1.284 14 H -0.283 1.283 15 N -0.296 5.296 16 N -0.324 5.324 17 C 0.326 3.674 18 N -0.428 5.428 19 C 0.033 3.967 20 C -0.143 4.143 21 C 0.082 3.918 22 H 0.074 0.926 23 O -0.370 6.370 24 C 0.064 3.936 25 C -0.096 4.096 26 C -0.147 4.147 27 C -0.144 4.144 28 C 0.052 3.948 29 H 0.060 0.940 30 H 0.083 0.917 31 H 0.077 0.923 32 H 0.098 0.902 33 H 0.092 0.908 34 H 0.088 0.912 35 H 0.069 0.931 36 H 0.017 0.983 37 H 0.024 0.976 38 H 0.261 0.739 39 H 0.059 0.941 40 H 0.096 0.904 41 H 0.090 0.910 42 H 0.079 0.921 43 H 0.048 0.952 44 H 0.049 0.951 45 H 0.079 0.921 46 H 0.055 0.945 47 H 0.056 0.944 48 H 0.061 0.939 49 H 0.051 0.949 50 H 0.064 0.936 51 H 0.052 0.948 52 H 0.087 0.913 53 H 0.100 0.900 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 4.183 -4.516 25.664 26.392 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 -0.241 4.241 2 C -0.015 4.015 3 N -0.170 5.170 4 C -0.054 4.054 5 C -0.071 4.071 6 C -0.007 4.007 7 C -0.561 4.561 8 H 0.077 0.923 9 C -0.143 4.143 10 N -0.531 5.531 11 Si 0.722 3.278 12 H -0.196 1.196 13 H -0.211 1.211 14 H -0.209 1.209 15 N -0.134 5.134 16 N -0.168 5.168 17 C -0.031 4.031 18 N -0.153 5.153 19 C -0.094 4.094 20 C -0.181 4.181 21 C 0.023 3.977 22 H 0.092 0.908 23 O -0.289 6.289 24 C -0.012 4.012 25 C -0.114 4.114 26 C -0.204 4.204 27 C -0.202 4.202 28 C -0.075 4.075 29 H 0.079 0.921 30 H 0.102 0.898 31 H 0.096 0.904 32 H 0.117 0.883 33 H 0.110 0.890 34 H 0.107 0.893 35 H 0.087 0.913 36 H 0.036 0.964 37 H 0.043 0.957 38 H 0.070 0.930 39 H 0.077 0.923 40 H 0.115 0.885 41 H 0.109 0.891 42 H 0.098 0.902 43 H 0.066 0.934 44 H 0.067 0.933 45 H 0.097 0.903 46 H 0.075 0.925 47 H 0.075 0.925 48 H 0.080 0.920 49 H 0.070 0.930 50 H 0.083 0.917 51 H 0.071 0.929 52 H 0.105 0.895 53 H 0.118 0.882 Dipole moment (debyes) X Y Z Total from point charges 5.023 -3.599 25.730 26.462 hybrid contribution -1.455 -0.869 -1.064 2.001 sum 3.569 -4.468 24.666 25.320 Atomic orbital electron populations 1.22442 0.93749 1.03504 1.04368 1.21833 0.96000 0.79071 1.04610 1.46259 1.51251 1.13832 1.05609 1.25556 0.99353 0.88060 0.92430 1.20438 1.03421 1.00575 0.82665 1.19121 0.87858 0.97816 0.95910 1.21184 0.98316 1.40536 0.96019 0.92253 1.25006 0.95912 0.95088 0.98271 1.69978 1.03249 1.43202 1.36682 0.86508 0.78092 0.78266 0.84977 1.19614 1.21061 1.20943 1.73986 1.19837 1.17698 1.01885 1.74414 1.22982 1.15182 1.04254 1.22543 1.04529 0.88612 0.87399 1.61478 1.19981 1.36669 0.97128 1.23566 0.87350 1.02692 0.95823 1.23036 0.99979 1.00168 0.94905 1.22935 0.91765 0.97293 0.85716 0.90826 1.87963 1.48267 1.77778 1.14901 1.22639 0.96488 0.97134 0.84972 1.21098 0.99999 0.96943 0.93381 1.21793 1.01320 1.00355 0.96927 1.21786 1.01556 0.94876 1.01940 1.22870 1.01298 0.93243 0.90120 0.92114 0.89797 0.90440 0.88323 0.89017 0.89334 0.91282 0.96447 0.95719 0.92958 0.92293 0.88544 0.89098 0.90223 0.93354 0.93295 0.90297 0.92541 0.92493 0.92020 0.92984 0.91692 0.92883 0.89513 0.88170 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 13. 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 -0.18 -2.35 9.88 37.16 0.37 -1.98 16 2 C 0.11 1.41 5.95 -4.04 -0.02 1.39 16 3 N -0.47 -8.09 2.81 -114.08 -0.32 -8.41 16 4 C 0.21 4.30 7.32 -154.01 -1.13 3.18 16 5 C -0.03 -0.64 5.53 -27.88 -0.15 -0.79 16 6 C 0.03 0.78 4.96 -27.88 -0.14 0.64 16 7 C -0.52 -14.11 9.11 -34.44 -0.31 -14.42 16 8 H 0.06 1.54 7.74 -52.49 -0.41 1.13 16 9 C 0.06 1.64 5.46 -17.82 -0.10 1.54 16 10 N -0.89 -26.12 13.29 55.43 0.74 -25.39 16 11 Si 0.89 21.04 29.54 -169.99 -5.02 16.02 16 12 H -0.27 -6.23 7.11 56.52 0.40 -5.82 16 13 H -0.28 -6.61 7.11 56.52 0.40 -6.21 16 14 H -0.28 -6.69 7.11 56.52 0.40 -6.28 16 15 N -0.30 -6.54 12.18 32.99 0.40 -6.14 16 16 N -0.32 -6.57 10.69 30.32 0.32 -6.24 16 17 C 0.33 5.63 7.04 -318.87 -2.24 3.38 16 18 N -0.43 -5.87 5.32 -170.55 -0.91 -6.78 16 19 C 0.03 0.36 4.88 -1.90 -0.01 0.35 16 20 C -0.14 -1.26 6.80 -24.87 -0.17 -1.43 16 21 C 0.08 0.80 3.48 -25.38 -0.09 0.71 16 22 H 0.07 0.65 7.81 -51.93 -0.41 0.24 16 23 O -0.37 -3.68 9.47 -35.23 -0.33 -4.01 16 24 C 0.06 0.49 5.16 37.15 0.19 0.68 16 25 C -0.10 -0.65 3.16 -90.63 -0.29 -0.94 16 26 C -0.15 -0.77 9.19 37.16 0.34 -0.43 16 27 C -0.14 -0.98 9.09 37.16 0.34 -0.64 16 28 C 0.05 0.65 6.29 -2.76 -0.02 0.64 16 29 H 0.06 0.73 5.18 -51.93 -0.27 0.46 16 30 H 0.08 1.40 6.24 -51.93 -0.32 1.08 16 31 H 0.08 0.79 8.14 -51.93 -0.42 0.37 16 32 H 0.10 1.23 7.25 -51.93 -0.38 0.85 16 33 H 0.09 1.01 7.93 -51.93 -0.41 0.60 16 34 H 0.09 1.81 8.14 -51.93 -0.42 1.39 16 35 H 0.07 1.26 7.27 -51.93 -0.38 0.88 16 36 H 0.02 0.45 6.24 -51.93 -0.32 0.12 16 37 H 0.02 0.69 8.14 -51.93 -0.42 0.27 16 38 H 0.26 7.21 8.31 -40.82 -0.34 6.87 16 39 H 0.06 0.74 7.89 -51.93 -0.41 0.33 16 40 H 0.10 0.97 5.69 -51.93 -0.30 0.67 16 41 H 0.09 0.80 8.08 -51.93 -0.42 0.38 16 42 H 0.08 0.57 8.14 -51.93 -0.42 0.15 16 43 H 0.05 0.33 8.14 -51.93 -0.42 -0.09 16 44 H 0.05 0.35 8.10 -51.93 -0.42 -0.08 16 45 H 0.08 0.59 8.14 -51.93 -0.42 0.17 16 46 H 0.06 0.27 8.14 -51.93 -0.42 -0.15 16 47 H 0.06 0.28 8.14 -51.93 -0.42 -0.14 16 48 H 0.06 0.29 8.14 -51.93 -0.42 -0.13 16 49 H 0.05 0.33 8.14 -51.93 -0.42 -0.09 16 50 H 0.06 0.53 7.82 -51.93 -0.41 0.12 16 51 H 0.05 0.32 8.14 -51.93 -0.42 -0.11 16 52 H 0.09 1.23 6.84 -51.93 -0.36 0.87 16 53 H 0.10 1.29 7.96 -51.93 -0.41 0.88 16 LS Contribution 413.83 15.07 6.24 6.24 Total: -1.00 -32.41 413.83 -11.72 -44.12 By element: Atomic # 1 Polarization: 8.11 SS G_CDS: -9.40 Total: -1.29 kcal Atomic # 6 Polarization: -4.69 SS G_CDS: -3.43 Total: -8.12 kcal Atomic # 7 Polarization: -53.18 SS G_CDS: 0.23 Total: -52.95 kcal Atomic # 8 Polarization: -3.68 SS G_CDS: -0.33 Total: -4.01 kcal Atomic # 14 Polarization: 21.04 SS G_CDS: -5.02 Total: 16.02 kcal Total LS contribution 6.24 Total: 6.24 kcal Total: -32.41 -11.72 -44.12 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. ZINC001356486015.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 66.715 kcal (2) G-P(sol) polarization free energy of solvation -32.407 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 34.308 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -11.716 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -44.122 kcal (6) G-S(sol) free energy of system = (1) + (5) 22.593 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.84 seconds