Wall clock time and date at job start Sat Apr 11 2020 06:10:52 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 1.53000 * 1 3 3 C 1.53000 * 109.47184 * 2 1 4 4 H 1.09004 * 109.47142 * 55.00357 * 3 2 1 5 5 O 1.42898 * 109.47469 * 295.00384 * 3 2 1 6 6 C 1.42897 * 114.00192 * 149.99913 * 5 3 2 7 7 C 1.50698 * 109.47374 * 174.99955 * 3 2 1 8 8 O 1.21288 * 119.99831 * 114.99974 * 7 3 2 9 9 N 1.34778 * 120.00263 * 295.00798 * 7 3 2 10 10 C 1.48198 * 127.79887 * 359.97438 * 9 7 3 11 11 C 1.54513 * 104.63362 * 219.28544 * 10 9 7 12 12 H 1.09004 * 110.47364 * 95.09760 * 11 10 9 13 13 C 1.53004 * 110.37330 * 217.39299 * 11 10 9 14 14 N 1.46499 * 109.47198 * 290.35973 * 13 11 10 15 15 C 1.36939 * 119.99933 * 180.27608 * 14 13 11 16 16 H 1.08001 * 119.99700 * 359.72658 * 15 14 13 17 17 C 1.38810 * 120.00095 * 179.71972 * 15 14 13 18 18 N 1.31624 * 119.99740 * 0.02562 * 17 15 14 19 19 Si 1.86796 * 120.00044 * 179.97438 * 17 15 14 20 20 H 1.48501 * 109.47173 * 60.00435 * 19 17 15 21 21 H 1.48497 * 109.47172 * 180.02562 * 19 17 15 22 22 H 1.48506 * 109.47132 * 300.00314 * 19 17 15 23 23 C 1.53777 * 104.78426 * 336.22125 * 11 10 9 24 24 C 1.48259 * 127.80384 * 180.02562 * 9 7 3 25 25 C 1.52595 * 110.28542 * 241.20226 * 23 11 10 26 26 C 1.53203 * 109.19789 * 182.28714 * 25 23 11 27 27 O 1.42905 * 109.34156 * 56.66449 * 26 25 23 28 28 C 1.42918 * 114.22881 * 298.39321 * 27 26 25 29 29 C 1.52591 * 110.27356 * 119.03869 * 23 11 10 30 30 H 1.09001 * 109.46837 * 299.99778 * 1 2 3 31 31 H 1.08995 * 109.46890 * 59.99393 * 1 2 3 32 32 H 1.08997 * 109.46837 * 180.02562 * 1 2 3 33 33 H 1.09007 * 109.47049 * 240.00633 * 2 1 3 34 34 H 1.08999 * 109.47690 * 120.00215 * 2 1 3 35 35 H 1.09003 * 109.47183 * 299.99790 * 6 5 3 36 36 H 1.08998 * 109.47556 * 59.99734 * 6 5 3 37 37 H 1.09005 * 109.47416 * 179.97438 * 6 5 3 38 38 H 1.08997 * 110.39881 * 100.49340 * 10 9 7 39 39 H 1.08997 * 110.40372 * 338.07448 * 10 9 7 40 40 H 1.09009 * 109.46730 * 170.35760 * 13 11 10 41 41 H 1.08998 * 109.46846 * 50.36305 * 13 11 10 42 42 H 0.97001 * 119.99790 * 359.97438 * 14 13 11 43 43 H 0.96998 * 119.99409 * 179.97438 * 18 17 15 44 44 H 1.09005 * 110.42876 * 22.10112 * 24 9 7 45 45 H 1.09005 * 110.42966 * 259.61939 * 24 9 7 46 46 H 1.09000 * 109.51441 * 302.20128 * 25 23 11 47 47 H 1.09004 * 109.51687 * 62.36914 * 25 23 11 48 48 H 1.09004 * 109.49181 * 296.70931 * 26 25 23 49 49 H 1.08991 * 109.49528 * 176.62894 * 26 25 23 50 50 H 1.08993 * 109.49400 * 301.66139 * 28 27 26 51 51 H 1.08998 * 109.51817 * 181.58563 * 28 27 26 52 52 H 1.09005 * 109.51376 * 297.64966 * 29 23 11 53 53 H 1.08994 * 109.51726 * 57.81561 * 29 23 11 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 6 2.0400 1.4425 0.0000 4 1 1.6054 1.9815 0.8419 5 8 1.6619 2.0815 -1.2210 6 6 1.4559 3.4903 -1.1001 7 6 3.5419 1.4443 0.1238 8 8 4.2250 1.8612 -0.7876 9 7 4.1261 0.9827 1.2473 10 6 3.4652 0.4388 2.4571 11 6 4.2946 0.9926 3.6373 12 1 3.8424 1.9050 4.0261 13 6 4.4113 -0.0566 4.7449 14 7 3.1052 -0.2412 5.3822 15 6 2.9658 -1.1331 6.4120 16 1 3.8178 -1.7035 6.7514 17 6 1.7295 -1.3038 7.0198 18 7 0.6912 -0.6089 6.6059 19 14 1.5393 -2.5209 8.4240 20 1 2.4374 -2.1323 9.5409 21 1 0.1313 -2.5161 8.8958 22 1 1.8977 -3.8823 7.9511 23 6 5.6780 1.2940 3.0374 24 6 5.5749 0.9052 1.5524 25 6 6.7487 0.4546 3.7284 26 6 8.1215 0.8155 3.1522 27 8 8.3459 2.2183 3.3071 28 6 7.4040 3.0426 2.6173 29 6 5.9996 2.7797 3.1704 30 1 -0.3633 0.5138 0.8900 31 1 -0.3633 0.5139 -0.8899 32 1 -0.3633 -1.0276 0.0005 33 1 1.8933 -0.5138 -0.8901 34 1 1.8934 -0.5138 0.8899 35 1 0.6618 3.6808 -0.3782 36 1 2.3768 3.9645 -0.7608 37 1 1.1723 3.9006 -2.0694 38 1 3.4956 -0.6507 2.4493 39 1 2.4353 0.7906 2.5182 40 1 5.1343 0.2791 5.4885 41 1 4.7433 -1.0021 4.3162 42 1 2.3401 0.2714 5.0777 43 1 -0.1728 -0.7285 7.0304 44 1 6.1319 1.6101 0.9351 45 1 5.9424 -0.1094 1.3986 46 1 6.7376 0.6598 4.7988 47 1 6.5486 -0.6032 3.5575 48 1 8.1510 0.5572 2.0936 49 1 8.8959 0.2624 3.6836 50 1 7.4257 2.8077 1.5532 51 1 7.6621 4.0914 2.7637 52 1 5.2711 3.3619 2.6061 53 1 5.9621 3.0678 4.2209 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 ZINC001186282282.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 06:10:52 Heat of formation + Delta-G solvation = -114.556359 kcal Electronic energy + Delta-G solvation = -32390.956111 eV Core-core repulsion = 28263.026315 eV Total energy + Delta-G solvation = -4127.929795 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) -41.07664 -39.60756 -37.77751 -37.01516 -34.73841 -34.02771 -33.02630 -31.76275 -31.17211 -29.30764 -28.47844 -27.02888 -25.81757 -25.41098 -24.30754 -23.79588 -22.31962 -22.03763 -20.65367 -19.57081 -18.54162 -17.68272 -17.05655 -16.79876 -16.12156 -16.00254 -15.82390 -15.68297 -15.25146 -14.90980 -14.66852 -14.51888 -14.37429 -14.07046 -13.80807 -13.61607 -13.37086 -13.15624 -12.78318 -12.67566 -12.46585 -12.34893 -12.23534 -11.95749 -11.87126 -11.63871 -11.59450 -11.30961 -11.22026 -11.11303 -11.02077 -10.85663 -10.84366 -10.74476 -10.56909 -10.26737 -10.12556 -10.03609 -9.76381 -9.44274 -9.28042 -8.92966 -8.71271 -7.00419 -5.84151 -3.13062 2.55627 2.81377 3.39449 3.44620 3.44945 3.64605 3.81977 4.25426 4.44581 4.55280 4.57634 4.62363 4.76038 4.80157 4.95459 5.02631 5.06881 5.13320 5.17934 5.22851 5.26558 5.29842 5.33641 5.38276 5.46181 5.49450 5.51948 5.55885 5.60596 5.62721 5.66162 5.71239 5.78975 5.86026 5.91251 5.94815 5.98492 5.99155 6.02425 6.10581 6.22389 6.23257 6.27971 6.35290 6.65892 6.72947 6.88612 7.13459 7.52495 7.63039 8.13360 8.34566 9.46195 10.01824 10.36250 11.38510 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.007581 B = 0.004488 C = 0.003019 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 3692.491108 B = 6236.898069 C = 9273.686655 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.148 4.148 2 C -0.119 4.119 3 C 0.079 3.921 4 H 0.088 0.912 5 O -0.357 6.357 6 C 0.029 3.971 7 C 0.512 3.488 8 O -0.536 6.536 9 N -0.619 5.619 10 C 0.106 3.894 11 C -0.097 4.097 12 H 0.084 0.916 13 C 0.162 3.838 14 N -0.733 5.733 15 C -0.241 4.241 16 H 0.070 0.930 17 C -0.011 4.011 18 N -0.933 5.933 19 Si 0.906 3.094 20 H -0.286 1.286 21 H -0.291 1.291 22 H -0.286 1.286 23 C -0.064 4.064 24 C 0.112 3.888 25 C -0.145 4.145 26 C 0.058 3.942 27 O -0.383 6.383 28 C 0.060 3.940 29 C -0.139 4.139 30 H 0.058 0.942 31 H 0.060 0.940 32 H 0.061 0.939 33 H 0.074 0.926 34 H 0.087 0.913 35 H 0.043 0.957 36 H 0.043 0.957 37 H 0.088 0.912 38 H 0.083 0.917 39 H 0.082 0.918 40 H 0.028 0.972 41 H 0.024 0.976 42 H 0.382 0.618 43 H 0.256 0.744 44 H 0.080 0.920 45 H 0.072 0.928 46 H 0.087 0.913 47 H 0.082 0.918 48 H 0.047 0.953 49 H 0.094 0.906 50 H 0.050 0.950 51 H 0.092 0.908 52 H 0.071 0.929 53 H 0.078 0.922 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 6.856 5.964 -12.422 15.391 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 -0.206 4.206 2 C -0.157 4.157 3 C 0.018 3.982 4 H 0.105 0.895 5 O -0.274 6.274 6 C -0.067 4.067 7 C 0.300 3.700 8 O -0.413 6.413 9 N -0.355 5.355 10 C -0.016 4.016 11 C -0.117 4.117 12 H 0.103 0.897 13 C 0.034 3.966 14 N -0.377 5.377 15 C -0.372 4.372 16 H 0.088 0.912 17 C -0.207 4.207 18 N -0.582 5.582 19 Si 0.737 3.263 20 H -0.213 1.213 21 H -0.217 1.217 22 H -0.212 1.212 23 C -0.066 4.066 24 C -0.011 4.011 25 C -0.183 4.183 26 C -0.018 4.018 27 O -0.302 6.302 28 C -0.017 4.017 29 C -0.176 4.176 30 H 0.077 0.923 31 H 0.079 0.921 32 H 0.080 0.920 33 H 0.093 0.907 34 H 0.106 0.894 35 H 0.062 0.938 36 H 0.061 0.939 37 H 0.107 0.893 38 H 0.101 0.899 39 H 0.100 0.900 40 H 0.046 0.954 41 H 0.041 0.959 42 H 0.216 0.784 43 H 0.066 0.934 44 H 0.099 0.901 45 H 0.090 0.910 46 H 0.106 0.894 47 H 0.101 0.899 48 H 0.066 0.934 49 H 0.112 0.888 50 H 0.068 0.932 51 H 0.110 0.890 52 H 0.089 0.911 53 H 0.097 0.903 Dipole moment (debyes) X Y Z Total from point charges 7.294 6.085 -12.987 16.090 hybrid contribution -0.699 -0.415 0.909 1.220 sum 6.594 5.670 -12.078 14.883 Atomic orbital electron populations 1.21710 0.94153 1.02352 1.02358 1.21656 0.97631 0.92563 1.03844 1.22069 0.90261 0.96826 0.89086 0.89459 1.87968 1.88005 1.20819 1.30577 1.22850 0.99773 0.81473 1.02638 1.21070 0.91098 0.77103 0.80681 1.90687 1.65222 1.47061 1.38302 1.49144 1.08082 1.62192 1.16055 1.22686 0.97266 0.99253 0.82398 1.22313 0.93462 1.00569 0.95339 0.89736 1.20854 0.89883 0.94110 0.91740 1.42370 1.05692 1.49375 1.40254 1.19148 0.94643 1.14892 1.08539 0.91247 1.24710 0.95824 1.00138 0.99993 1.69635 1.00192 1.44073 1.44258 0.86293 0.76729 0.80997 0.82310 1.21262 1.21687 1.21250 1.21061 0.95696 0.95590 0.94231 1.22465 0.82116 1.01583 0.94904 1.22314 0.93668 1.00411 1.01868 1.22683 0.97269 0.81998 0.99889 1.87908 1.52228 1.16641 1.73412 1.22643 0.88489 0.95200 0.95365 1.22144 0.97324 0.95328 1.02827 0.92312 0.92051 0.92043 0.90693 0.89432 0.93807 0.93863 0.89338 0.89906 0.89980 0.95400 0.95870 0.78414 0.93435 0.90118 0.90990 0.89446 0.89900 0.93429 0.88815 0.93201 0.89023 0.91059 0.90327 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 -1.59 9.81 37.16 0.36 -1.23 16 2 C -0.12 -1.41 5.47 -26.73 -0.15 -1.55 16 3 C 0.08 1.01 1.82 -27.88 -0.05 0.96 16 4 H 0.09 1.02 7.37 -51.93 -0.38 0.63 16 5 O -0.36 -4.82 9.42 -55.09 -0.52 -5.34 16 6 C 0.03 0.31 10.81 101.05 1.09 1.40 16 7 C 0.51 7.58 7.25 -10.99 -0.08 7.50 16 8 O -0.54 -9.67 16.78 -14.31 -0.24 -9.91 16 9 N -0.62 -8.26 3.32 -169.42 -0.56 -8.82 16 10 C 0.11 1.44 4.71 -2.31 -0.01 1.42 16 11 C -0.10 -1.37 2.74 -89.42 -0.24 -1.61 16 12 H 0.08 1.27 7.70 -51.93 -0.40 0.87 16 13 C 0.16 2.83 4.41 -4.04 -0.02 2.81 16 14 N -0.73 -16.77 5.48 -59.90 -0.33 -17.10 16 15 C -0.24 -6.32 9.99 -15.06 -0.15 -6.47 16 16 H 0.07 1.77 7.83 -52.49 -0.41 1.36 16 17 C -0.01 -0.29 5.50 -17.43 -0.10 -0.38 16 18 N -0.93 -26.71 13.06 55.49 0.72 -25.98 16 19 Si 0.91 21.52 29.55 -169.99 -5.02 16.50 16 20 H -0.29 -6.73 7.11 56.52 0.40 -6.33 16 21 H -0.29 -7.00 7.11 56.52 0.40 -6.60 16 22 H -0.29 -6.69 7.11 56.52 0.40 -6.29 16 23 C -0.06 -0.77 0.69 -154.08 -0.11 -0.87 16 24 C 0.11 1.38 5.11 -2.63 -0.01 1.36 16 25 C -0.14 -1.65 3.62 -26.83 -0.10 -1.75 16 26 C 0.06 0.61 6.65 37.26 0.25 0.86 16 27 O -0.38 -4.69 10.75 -35.23 -0.38 -5.07 16 28 C 0.06 0.65 6.64 37.26 0.25 0.89 16 29 C -0.14 -1.59 4.67 -26.84 -0.13 -1.71 16 30 H 0.06 0.63 8.14 -51.93 -0.42 0.21 16 31 H 0.06 0.65 7.82 -51.93 -0.41 0.24 16 32 H 0.06 0.62 8.14 -51.93 -0.42 0.20 16 33 H 0.07 0.91 8.14 -51.93 -0.42 0.49 16 34 H 0.09 1.04 5.93 -51.93 -0.31 0.73 16 35 H 0.04 0.39 8.09 -51.93 -0.42 -0.03 16 36 H 0.04 0.49 8.14 -51.93 -0.42 0.06 16 37 H 0.09 0.78 8.14 -51.93 -0.42 0.36 16 38 H 0.08 1.17 7.63 -51.93 -0.40 0.78 16 39 H 0.08 1.10 6.80 -51.93 -0.35 0.75 16 40 H 0.03 0.51 6.42 -51.92 -0.33 0.17 16 41 H 0.02 0.41 6.98 -51.93 -0.36 0.05 16 42 H 0.38 9.18 7.62 -40.82 -0.31 8.87 16 43 H 0.26 7.16 8.31 -40.82 -0.34 6.82 16 44 H 0.08 1.04 5.91 -51.93 -0.31 0.73 16 45 H 0.07 0.84 7.77 -51.93 -0.40 0.44 16 46 H 0.09 1.10 6.52 -51.93 -0.34 0.77 16 47 H 0.08 0.92 6.97 -51.93 -0.36 0.55 16 48 H 0.05 0.46 7.54 -51.93 -0.39 0.07 16 49 H 0.09 0.86 8.14 -51.93 -0.42 0.43 16 50 H 0.05 0.53 6.52 -51.93 -0.34 0.19 16 51 H 0.09 0.87 8.14 -51.93 -0.42 0.45 16 52 H 0.07 0.83 8.14 -51.93 -0.42 0.41 16 53 H 0.08 0.95 8.14 -51.93 -0.42 0.53 16 LS Contribution 402.56 15.07 6.07 6.07 Total: -1.00 -31.52 402.56 -8.61 -40.13 By element: Atomic # 1 Polarization: 17.06 SS G_CDS: -9.16 Total: 7.90 kcal Atomic # 6 Polarization: 0.81 SS G_CDS: 0.81 Total: 1.63 kcal Atomic # 7 Polarization: -51.74 SS G_CDS: -0.17 Total: -51.90 kcal Atomic # 8 Polarization: -19.18 SS G_CDS: -1.14 Total: -20.31 kcal Atomic # 14 Polarization: 21.52 SS G_CDS: -5.02 Total: 16.50 kcal Total LS contribution 6.07 Total: 6.07 kcal Total: -31.52 -8.61 -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. ZINC001186282282.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 -74.426 kcal (2) G-P(sol) polarization free energy of solvation -31.518 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -105.945 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -8.611 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -40.130 kcal (6) G-S(sol) free energy of system = (1) + (5) -114.556 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.63 seconds