Wall clock time and date at job start Tue Mar 31 2020 21:18:56 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 N 1.46907 * 1 3 3 C 1.46896 * 110.99728 * 2 1 4 4 C 1.50696 * 109.47447 * 293.95421 * 3 2 1 5 5 H 1.07997 * 119.99944 * 0.02562 * 4 3 2 6 6 C 1.37876 * 120.00155 * 180.02562 * 4 3 2 7 7 N 1.31508 * 120.00177 * 0.02562 * 6 4 3 8 8 Si 1.86799 * 119.99921 * 179.97438 * 6 4 3 9 9 H 1.48501 * 109.47224 * 90.00126 * 8 6 4 10 10 H 1.48504 * 109.47283 * 209.99939 * 8 6 4 11 11 H 1.48491 * 109.47263 * 330.00017 * 8 6 4 12 12 C 1.46896 * 111.00113 * 123.95486 * 2 1 3 13 13 C 1.53005 * 109.47066 * 66.04684 * 12 2 1 14 14 H 1.08995 * 109.47278 * 305.00099 * 13 12 2 15 15 O 1.42893 * 109.46907 * 65.00251 * 13 12 2 16 16 C 1.53007 * 109.46927 * 185.00016 * 13 12 2 17 17 N 1.46898 * 109.46764 * 180.02562 * 16 13 12 18 18 C 1.46906 * 110.99888 * 180.02562 * 17 16 13 19 19 C 1.52999 * 109.46897 * 180.02562 * 18 17 16 20 20 C 1.52997 * 109.47317 * 60.00033 * 19 18 17 21 21 C 1.52997 * 109.47269 * 299.99689 * 19 18 17 22 22 C 1.50706 * 109.46573 * 179.97438 * 19 18 17 23 23 C 1.38244 * 119.97491 * 359.72327 * 22 19 18 24 24 C 1.38201 * 120.02142 * 179.72306 * 23 22 19 25 25 C 1.38459 * 119.97601 * 0.57371 * 24 23 22 26 26 F 1.35094 * 120.02797 * 179.67746 * 25 24 23 27 27 C 1.38461 * 119.94519 * 359.70287 * 25 24 23 28 28 C 1.38193 * 119.98059 * 359.97438 * 27 25 24 29 29 H 1.08999 * 109.47205 * 296.03949 * 1 2 3 30 30 H 1.08994 * 109.46984 * 56.04894 * 1 2 3 31 31 H 1.08999 * 109.46516 * 176.04188 * 1 2 3 32 32 H 1.09000 * 109.47447 * 53.95625 * 3 2 1 33 33 H 1.09001 * 109.47040 * 173.94946 * 3 2 1 34 34 H 0.96997 * 120.00457 * 180.02562 * 7 6 4 35 35 H 1.09003 * 109.47467 * 306.04936 * 12 2 1 36 36 H 1.08998 * 109.47209 * 186.04803 * 12 2 1 37 37 H 0.96694 * 114.00601 * 60.00191 * 15 13 12 38 38 H 1.08997 * 109.46954 * 60.00141 * 16 13 12 39 39 H 1.09004 * 109.47056 * 299.99842 * 16 13 12 40 40 H 1.00896 * 111.00084 * 303.95493 * 17 16 13 41 41 H 1.09000 * 109.47033 * 59.99886 * 18 17 16 42 42 H 1.09001 * 109.46544 * 299.99942 * 18 17 16 43 43 H 1.09001 * 109.46832 * 179.97438 * 20 19 18 44 44 H 1.09002 * 109.47153 * 299.99641 * 20 19 18 45 45 H 1.08996 * 109.46952 * 59.99813 * 20 19 18 46 46 H 1.09000 * 109.47140 * 300.00547 * 21 19 18 47 47 H 1.09001 * 109.47230 * 59.99691 * 21 19 18 48 48 H 1.09001 * 109.47375 * 180.02562 * 21 19 18 49 49 H 1.08000 * 119.98716 * 359.97438 * 23 22 19 50 50 H 1.07996 * 120.01399 * 180.25476 * 24 23 22 51 51 H 1.08009 * 120.01051 * 179.97438 * 27 25 24 52 52 H 1.07999 * 119.99486 * 179.97438 * 28 27 25 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 7 1.4691 0.0000 0.0000 3 6 1.9954 1.3714 0.0000 4 6 1.6369 2.0472 -1.2984 5 1 1.0740 1.5116 -2.0484 6 6 2.0276 3.3492 -1.5288 7 7 2.7136 4.0012 -0.6157 8 14 1.5838 4.1865 -3.1386 9 1 0.2717 4.8674 -2.9971 10 1 2.6265 5.1873 -3.4799 11 1 1.5004 3.1706 -4.2184 12 6 1.9955 -0.7660 1.1375 13 6 1.6315 -2.2427 0.9702 14 1 0.5533 -2.3390 0.8432 15 8 2.2957 -2.7695 -0.1800 16 6 2.0701 -3.0200 2.2130 17 7 1.7212 -4.4378 2.0521 18 6 2.1277 -5.2169 3.2294 19 6 1.7491 -6.6851 3.0248 20 6 2.4611 -7.2272 1.7838 21 6 0.2353 -6.7999 2.8352 22 6 2.1668 -7.4844 4.2323 23 6 2.7948 -6.8573 5.2922 24 6 3.1730 -7.5883 6.4024 25 6 2.9334 -8.9512 6.4478 26 9 3.3086 -9.6679 7.5298 27 6 2.3094 -9.5791 5.3831 28 6 1.9261 -8.8450 4.2768 29 1 -0.3633 0.4511 0.9233 30 1 -0.3633 0.5739 -0.8524 31 1 -0.3632 -1.0252 -0.0709 32 1 1.5611 1.9273 0.8309 33 1 3.0797 1.3444 0.1083 34 1 2.9882 4.9173 -0.7776 35 1 1.5612 -0.3873 2.0628 36 1 3.0798 -0.6611 1.1756 37 1 3.2602 -2.7167 -0.1360 38 1 1.5635 -2.6180 3.0905 39 1 3.1484 -2.9237 2.3401 40 1 0.7354 -4.5490 1.8681 41 1 1.6208 -4.8303 4.1136 42 1 3.2063 -5.1354 3.3641 43 1 2.1917 -8.2734 1.6384 44 1 2.1595 -6.6492 0.9103 45 1 3.5396 -7.1455 1.9189 46 1 -0.2719 -6.4136 3.7193 47 1 -0.0664 -6.2217 1.9618 48 1 -0.0344 -7.8459 2.6899 49 1 2.9863 -5.7951 5.2543 50 1 3.6600 -7.0975 7.2321 51 1 2.1224 -10.6423 5.4173 52 1 1.4397 -9.3346 3.4461 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) F: (AM1): M.J.S. DEWAR AND E. G. ZOEBISCH, THEOCHEM, 180, 1 (1988). 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 ZINC000571315874.mol2 52 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 21:18:56 Heat of formation + Delta-G solvation = -72.655030 kcal Electronic energy + Delta-G solvation = -28866.044346 eV Core-core repulsion = 24779.615796 eV Total energy + Delta-G solvation = -4086.428549 eV No. of doubly occupied orbitals = 65 Molecular weight (most abundant/longest-lived isotopes) = 338.211 amu Computer time = 0.80 seconds Orbital eigenvalues (eV) -49.24222 -40.32674 -38.33391 -37.10133 -35.51011 -33.88900 -32.50997 -31.67541 -30.03785 -29.36202 -27.52373 -27.24799 -26.63896 -25.16458 -23.54794 -23.17231 -22.48375 -21.34074 -20.18381 -19.48052 -18.16011 -16.91444 -16.58202 -16.32382 -16.14616 -15.94773 -15.53990 -15.26423 -15.09377 -14.81788 -14.59825 -14.24725 -14.11792 -13.97895 -13.80455 -13.48959 -13.44905 -13.30377 -12.95176 -12.72838 -12.59097 -12.18311 -12.14212 -11.93016 -11.79899 -11.67810 -11.34446 -11.23263 -11.14397 -11.05170 -10.89190 -10.81808 -10.73503 -10.68858 -10.27188 -9.97041 -9.55426 -9.52211 -9.09439 -8.92045 -8.52204 -8.43582 -7.19674 -6.02438 -4.03389 0.74099 0.81650 3.16847 3.32472 3.38617 3.43918 3.78839 3.87728 4.20814 4.33218 4.43671 4.48379 4.55159 4.62668 4.78685 4.83478 4.87261 4.90383 5.00787 5.14560 5.25707 5.33033 5.34606 5.38070 5.46284 5.47106 5.54031 5.55886 5.61224 5.64466 5.67460 5.70012 5.70852 5.77940 5.82379 5.97756 6.04838 6.13965 6.18138 6.21124 6.29393 6.40671 6.48740 6.75467 6.81106 7.19541 7.27184 7.32345 7.80841 8.05150 8.14956 8.21375 8.55750 9.04666 9.60846 11.08530 Molecular weight = 338.21amu Principal moments of inertia in cm(-1) A = 0.031059 B = 0.001622 C = 0.001580 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 901.303585 B =17263.609416 C =17719.508750 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.036 3.964 2 N -0.529 5.529 3 C 0.192 3.808 4 C -0.505 4.505 5 H 0.064 0.936 6 C 0.054 3.946 7 N -0.900 5.900 8 Si 0.898 3.102 9 H -0.282 1.282 10 H -0.287 1.287 11 H -0.272 1.272 12 C 0.025 3.975 13 C 0.117 3.883 14 H 0.091 0.909 15 O -0.535 6.535 16 C 0.026 3.974 17 N -0.674 5.674 18 C 0.065 3.935 19 C -0.022 4.022 20 C -0.130 4.130 21 C -0.143 4.143 22 C -0.075 4.075 23 C -0.094 4.094 24 C -0.150 4.150 25 C 0.088 3.912 26 F -0.143 7.143 27 C -0.151 4.151 28 C -0.085 4.085 29 H 0.007 0.993 30 H 0.075 0.925 31 H 0.046 0.954 32 H -0.011 1.011 33 H 0.028 0.972 34 H 0.261 0.739 35 H 0.026 0.974 36 H 0.070 0.930 37 H 0.368 0.632 38 H 0.034 0.966 39 H 0.075 0.925 40 H 0.341 0.659 41 H 0.030 0.970 42 H 0.075 0.925 43 H 0.048 0.952 44 H 0.078 0.922 45 H 0.053 0.947 46 H 0.054 0.946 47 H 0.068 0.932 48 H 0.059 0.941 49 H 0.135 0.865 50 H 0.134 0.866 51 H 0.134 0.866 52 H 0.132 0.868 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -1.603 -26.888 13.592 30.171 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 -0.112 4.112 2 N -0.253 5.253 3 C 0.067 3.933 4 C -0.544 4.544 5 H 0.082 0.918 6 C -0.147 4.147 7 N -0.540 5.540 8 Si 0.726 3.274 9 H -0.208 1.208 10 H -0.213 1.213 11 H -0.197 1.197 12 C -0.105 4.105 13 C 0.057 3.943 14 H 0.109 0.891 15 O -0.339 6.339 16 C -0.104 4.104 17 N -0.306 5.306 18 C -0.064 4.064 19 C -0.022 4.022 20 C -0.187 4.187 21 C -0.201 4.201 22 C -0.076 4.076 23 C -0.112 4.112 24 C -0.169 4.169 25 C 0.069 3.931 26 F -0.121 7.121 27 C -0.170 4.170 28 C -0.103 4.103 29 H 0.026 0.974 30 H 0.093 0.907 31 H 0.065 0.935 32 H 0.006 0.994 33 H 0.047 0.953 34 H 0.070 0.930 35 H 0.044 0.956 36 H 0.089 0.911 37 H 0.214 0.786 38 H 0.053 0.947 39 H 0.093 0.907 40 H 0.160 0.840 41 H 0.048 0.952 42 H 0.093 0.907 43 H 0.067 0.933 44 H 0.097 0.903 45 H 0.072 0.928 46 H 0.073 0.927 47 H 0.087 0.913 48 H 0.078 0.922 49 H 0.153 0.847 50 H 0.152 0.848 51 H 0.152 0.848 52 H 0.150 0.850 Dipole moment (debyes) X Y Z Total from point charges -1.388 -27.213 12.676 30.052 hybrid contribution -0.416 1.315 1.301 1.896 sum -1.804 -25.898 13.977 29.484 Atomic orbital electron populations 1.22255 0.89107 0.99495 1.00375 1.62025 1.06721 1.17411 1.39139 1.19743 0.95294 0.81623 0.96602 1.21172 1.34647 0.96857 1.01709 0.91779 1.24996 0.95310 0.97374 0.97038 1.69955 1.38461 1.11423 1.34185 0.86487 0.77931 0.79195 0.83755 1.20791 1.21276 1.19704 1.22731 1.00551 0.93963 0.93277 1.21861 0.97483 0.90619 0.84354 0.89076 1.86582 1.22898 1.83878 1.40533 1.22732 1.01571 0.88110 0.98007 1.60388 1.23784 1.08531 1.37911 1.22107 1.00843 0.92029 0.91411 1.19499 0.96153 0.93614 0.92938 1.21784 0.99981 1.00017 0.96918 1.21937 0.93695 1.02396 1.02053 1.19947 0.98095 0.93937 0.95576 1.21080 0.97337 1.00505 0.92247 1.21172 1.03050 0.92394 1.00277 1.17746 1.00498 0.89979 0.84844 1.91496 1.89453 1.78128 1.53068 1.21138 1.01253 1.01024 0.93603 1.20853 0.98767 0.93323 0.97398 0.97423 0.90665 0.93528 0.99368 0.95348 0.92970 0.95634 0.91142 0.78570 0.94749 0.90675 0.83971 0.95160 0.90678 0.93263 0.90280 0.92768 0.92738 0.91342 0.92180 0.84693 0.84808 0.84835 0.84976 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 0.04 0.71 9.14 60.07 0.55 1.26 16 2 N -0.53 -11.36 4.70 -244.37 -1.15 -12.51 16 3 C 0.19 5.03 4.72 -4.98 -0.02 5.00 16 4 C -0.51 -14.31 8.46 -34.44 -0.29 -14.60 16 5 H 0.06 1.81 7.12 -52.49 -0.37 1.44 16 6 C 0.05 1.54 5.46 -17.82 -0.10 1.44 16 7 N -0.90 -26.82 13.29 55.43 0.74 -26.08 16 8 Si 0.90 21.76 29.54 -169.99 -5.02 16.74 16 9 H -0.28 -6.71 7.11 56.52 0.40 -6.31 16 10 H -0.29 -6.88 7.11 56.52 0.40 -6.48 16 11 H -0.27 -6.51 7.11 56.52 0.40 -6.11 16 12 C 0.02 0.42 4.60 -3.82 -0.02 0.40 16 13 C 0.12 1.60 3.13 -26.72 -0.08 1.52 16 14 H 0.09 1.29 6.34 -51.93 -0.33 0.96 16 15 O -0.54 -8.13 13.15 -35.23 -0.46 -8.60 16 16 C 0.03 0.27 5.35 -3.82 -0.02 0.25 16 17 N -0.67 -6.26 5.58 -113.77 -0.63 -6.89 16 18 C 0.07 0.51 3.30 -3.82 -0.01 0.50 16 19 C -0.02 -0.15 0.67 -155.66 -0.10 -0.26 16 20 C -0.13 -0.98 8.13 37.16 0.30 -0.68 16 21 C -0.14 -0.93 7.96 37.16 0.30 -0.63 16 22 C -0.07 -0.54 4.76 -104.61 -0.50 -1.04 16 23 C -0.09 -0.68 8.97 -39.59 -0.36 -1.04 16 24 C -0.15 -1.15 10.03 -39.51 -0.40 -1.54 16 25 C 0.09 0.75 7.30 -39.42 -0.29 0.46 16 26 F -0.14 -1.34 17.27 2.25 0.04 -1.30 16 27 C -0.15 -1.09 10.03 -39.52 -0.40 -1.49 16 28 C -0.09 -0.58 8.71 -39.59 -0.34 -0.92 16 29 H 0.01 0.14 8.14 -51.93 -0.42 -0.28 16 30 H 0.07 1.59 6.76 -51.93 -0.35 1.24 16 31 H 0.05 0.78 6.37 -51.93 -0.33 0.45 16 32 H -0.01 -0.32 8.12 -51.93 -0.42 -0.74 16 33 H 0.03 0.79 7.93 -51.93 -0.41 0.38 16 34 H 0.26 7.34 8.31 -40.82 -0.34 7.00 16 35 H 0.03 0.43 8.12 -51.93 -0.42 0.00 16 36 H 0.07 1.18 7.93 -51.93 -0.41 0.77 16 37 H 0.37 4.70 9.05 45.56 0.41 5.11 16 38 H 0.03 0.35 8.14 -51.93 -0.42 -0.07 16 39 H 0.07 0.77 8.14 -51.93 -0.42 0.35 16 40 H 0.34 3.09 6.77 -39.29 -0.27 2.82 16 41 H 0.03 0.23 7.53 -51.93 -0.39 -0.16 16 42 H 0.07 0.61 7.50 -51.93 -0.39 0.22 16 43 H 0.05 0.32 7.39 -51.93 -0.38 -0.06 16 44 H 0.08 0.70 7.60 -51.93 -0.39 0.30 16 45 H 0.05 0.44 8.14 -51.93 -0.42 0.02 16 46 H 0.05 0.36 8.14 -51.93 -0.42 -0.06 16 47 H 0.07 0.46 6.57 -51.93 -0.34 0.12 16 48 H 0.06 0.34 7.39 -51.93 -0.38 -0.04 16 49 H 0.14 0.84 5.89 -52.49 -0.31 0.54 16 50 H 0.13 0.83 8.06 -52.49 -0.42 0.40 16 51 H 0.13 0.74 8.06 -52.48 -0.42 0.32 16 52 H 0.13 0.68 7.10 -52.49 -0.37 0.31 16 LS Contribution 412.16 15.07 6.21 6.21 Total: -1.00 -31.35 412.16 -10.03 -41.38 By element: Atomic # 1 Polarization: 10.39 SS G_CDS: -7.97 Total: 2.43 kcal Atomic # 6 Polarization: -9.60 SS G_CDS: -1.78 Total: -11.38 kcal Atomic # 7 Polarization: -44.43 SS G_CDS: -1.05 Total: -45.48 kcal Atomic # 8 Polarization: -8.13 SS G_CDS: -0.46 Total: -8.60 kcal Atomic # 9 Polarization: -1.34 SS G_CDS: 0.04 Total: -1.30 kcal Atomic # 14 Polarization: 21.76 SS G_CDS: -5.02 Total: 16.74 kcal Total LS contribution 6.21 Total: 6.21 kcal Total: -31.35 -10.03 -41.38 kcal The number of atoms in the molecule is 52 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. ZINC000571315874.mol2 52 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 -31.271 kcal (2) G-P(sol) polarization free energy of solvation -31.354 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -62.626 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.029 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -41.384 kcal (6) G-S(sol) free energy of system = (1) + (5) -72.655 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.80 seconds