Wall clock time and date at job start Sat Apr 11 2020 06:11:45 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 1.46899 * 1 3 3 C 1.46956 * 111.00293 * 2 1 4 4 C 1.53056 * 109.38342 * 183.17592 * 3 2 1 5 5 N 1.46963 * 109.35944 * 301.62902 * 4 3 2 6 6 C 1.46903 * 110.99595 * 183.16796 * 5 4 3 7 7 C 1.53000 * 109.47135 * 46.18010 * 6 5 4 8 8 C 1.52997 * 109.47021 * 180.02562 * 7 6 5 9 9 C 1.53000 * 109.47021 * 180.02562 * 8 7 6 10 10 N 1.46502 * 109.46843 * 179.97438 * 9 8 7 11 11 C 1.34779 * 119.99679 * 180.02562 * 10 9 8 12 12 O 1.21356 * 120.00023 * 359.97438 * 11 10 9 13 13 C 1.49447 * 119.99995 * 180.02562 * 11 10 9 14 14 O 1.21349 * 119.99944 * 359.97438 * 13 11 10 15 15 N 1.34779 * 119.99995 * 180.02562 * 13 11 10 16 16 C 1.46498 * 119.99900 * 179.97438 * 15 13 11 17 17 C 1.52996 * 109.47282 * 179.97438 * 16 15 13 18 18 C 1.50699 * 109.47518 * 180.02562 * 17 16 15 19 19 H 1.08001 * 120.00073 * 359.97438 * 18 17 16 20 20 C 1.37880 * 120.00440 * 180.02562 * 18 17 16 21 21 N 1.31517 * 119.99747 * 359.97438 * 20 18 17 22 22 Si 1.86802 * 120.00161 * 179.97438 * 20 18 17 23 23 H 1.48499 * 109.46732 * 90.00081 * 22 20 18 24 24 H 1.48503 * 109.46918 * 210.00018 * 22 20 18 25 25 H 1.48493 * 109.47221 * 330.00039 * 22 20 18 26 26 C 1.46956 * 110.89784 * 59.28921 * 5 4 3 27 27 C 1.46962 * 110.99604 * 123.79812 * 2 1 3 28 28 H 1.09006 * 109.46670 * 60.00118 * 1 2 3 29 29 H 1.09000 * 109.47249 * 179.97438 * 1 2 3 30 30 H 1.08993 * 109.47127 * 300.00706 * 1 2 3 31 31 H 1.09002 * 109.48806 * 303.15319 * 3 2 1 32 32 H 1.09002 * 109.49141 * 63.19591 * 3 2 1 33 33 H 1.08992 * 109.49038 * 61.57437 * 4 3 2 34 34 H 1.08994 * 109.48641 * 181.64718 * 4 3 2 35 35 H 1.08994 * 109.47069 * 166.17990 * 6 5 4 36 36 H 1.09001 * 109.47054 * 286.17919 * 6 5 4 37 37 H 1.09005 * 109.46953 * 299.99531 * 7 6 5 38 38 H 1.08991 * 109.47188 * 60.00097 * 7 6 5 39 39 H 1.09004 * 109.46942 * 299.99929 * 8 7 6 40 40 H 1.09001 * 109.47310 * 59.99823 * 8 7 6 41 41 H 1.09004 * 109.47205 * 299.99768 * 9 8 7 42 42 H 1.09001 * 109.47223 * 59.99770 * 9 8 7 43 43 H 0.96990 * 120.00361 * 359.97438 * 10 9 8 44 44 H 0.96997 * 119.99963 * 359.97438 * 15 13 11 45 45 H 1.09004 * 109.47633 * 299.99761 * 16 15 13 46 46 H 1.09001 * 109.47029 * 59.99908 * 16 15 13 47 47 H 1.09004 * 109.47326 * 300.00293 * 17 16 15 48 48 H 1.09001 * 109.46883 * 60.00162 * 17 16 15 49 49 H 0.96996 * 120.00223 * 180.02562 * 21 20 18 50 50 H 1.09002 * 109.48806 * 180.71933 * 26 5 4 51 51 H 1.09003 * 109.49203 * 60.65575 * 26 5 4 52 52 H 1.09001 * 109.48625 * 296.77747 * 27 2 1 53 53 H 1.09003 * 109.48941 * 56.82355 * 27 2 1 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 1.4690 0.0000 0.0000 3 6 1.9957 1.3719 0.0000 4 6 3.5236 1.3295 -0.0800 5 7 4.0501 0.5658 1.0599 6 6 5.5191 0.5658 1.0600 7 6 6.0292 1.9863 0.8095 8 6 7.5591 1.9861 0.8090 9 6 8.0692 3.4068 0.5591 10 7 9.5342 3.4067 0.5592 11 6 10.2082 4.5563 0.3576 12 8 9.6014 5.5914 0.1755 13 6 11.7026 4.5562 0.3571 14 8 12.3093 3.5210 0.5387 15 7 12.3766 5.7059 0.1560 16 6 13.8415 5.7058 0.1560 17 6 14.3517 7.1266 -0.0932 18 6 15.8586 7.1264 -0.0937 19 1 16.3986 6.2052 0.0680 20 6 16.5481 8.3026 -0.2996 21 7 15.8906 9.4245 -0.4960 22 14 18.4162 8.3025 -0.2995 23 1 18.9111 8.0610 -1.6787 24 1 18.9112 9.6175 0.1810 25 1 18.9111 7.2288 0.5990 26 6 3.5234 -0.8061 1.0599 27 6 1.9956 -0.7632 1.1402 28 1 -0.3633 0.5139 -0.8901 29 1 -0.3634 -1.0277 -0.0005 30 1 -0.3633 0.5139 0.8899 31 1 1.6014 1.9128 -0.8603 32 1 1.6935 1.8775 0.9171 33 1 3.8258 0.8485 -1.0102 34 1 3.9176 2.3453 -0.0506 35 1 5.8823 0.2143 2.0257 36 1 5.8824 -0.0949 0.2728 37 1 5.6659 2.3377 -0.1563 38 1 5.6659 2.6469 1.5967 39 1 7.9227 1.6345 1.7746 40 1 7.9221 1.3256 0.0216 41 1 7.7056 3.7589 -0.4063 42 1 7.7062 4.0670 1.3469 43 1 10.0191 2.5795 0.7051 44 1 11.8916 6.5334 0.0112 45 1 14.2049 5.3531 1.1213 46 1 14.2049 5.0463 -0.6320 47 1 13.9884 7.4790 -1.0586 48 1 13.9883 7.7864 0.6947 49 1 16.3756 10.2519 -0.6412 50 1 3.9176 -1.3470 1.9202 51 1 3.8253 -1.3116 0.1426 52 1 1.6936 -0.2820 2.0704 53 1 1.6009 -1.7789 1.1113 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 ZINC001117022621.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 06:11:45 Heat of formation + Delta-G solvation = -75.107997 kcal Electronic energy + Delta-G solvation = -28148.432970 eV Core-core repulsion = 24054.506536 eV Total energy + Delta-G solvation = -4093.926435 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.226 amu Computer time = 0.80 seconds Orbital eigenvalues (eV) -40.41021 -39.89788 -38.36014 -37.02446 -35.75600 -34.97190 -33.20754 -32.79508 -31.46042 -29.87776 -29.66071 -27.44897 -25.61921 -24.71184 -24.16283 -23.44135 -22.25607 -21.49071 -20.99636 -20.24286 -20.03410 -18.25741 -16.82802 -16.76878 -16.47194 -16.28484 -15.78570 -15.63469 -15.49632 -15.40835 -15.14122 -14.92661 -14.81522 -14.62915 -14.41854 -14.20417 -13.50877 -13.46032 -13.07890 -12.92333 -12.84067 -12.62674 -12.38109 -12.32119 -12.01532 -11.94109 -11.79656 -11.75012 -11.48484 -11.27236 -11.23407 -11.18436 -11.06213 -10.89753 -10.66735 -10.39793 -9.79630 -9.44666 -9.35596 -9.19448 -8.96629 -8.76936 -8.69468 -8.41747 -6.10191 -4.13923 1.61976 2.53010 3.29050 3.33076 3.35398 3.39037 3.40378 3.43669 3.89365 4.23320 4.34479 4.40334 4.44683 4.51523 4.60690 4.71589 4.77998 4.79564 4.83632 4.88435 4.96362 4.99667 5.01101 5.09247 5.18779 5.25589 5.26783 5.27687 5.34269 5.37164 5.38206 5.49597 5.52596 5.55355 5.77278 5.81030 6.11822 6.18245 6.23838 6.38107 6.41448 6.59609 6.59785 6.61190 6.69444 7.05402 7.46819 7.57862 7.67112 7.87144 7.93222 8.21340 8.34288 8.91724 9.51079 11.01343 Molecular weight = 340.23amu Principal moments of inertia in cm(-1) A = 0.046733 B = 0.001196 C = 0.001173 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 598.999035 B =23399.322532 C =23859.084858 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.025 3.975 2 N -0.547 5.547 3 C 0.055 3.945 4 C 0.050 3.950 5 N -0.541 5.541 6 C 0.057 3.943 7 C -0.120 4.120 8 C -0.131 4.131 9 C 0.118 3.882 10 N -0.707 5.707 11 C 0.507 3.493 12 O -0.520 6.520 13 C 0.497 3.503 14 O -0.534 6.534 15 N -0.686 5.686 16 C 0.118 3.882 17 C 0.011 3.989 18 C -0.524 4.524 19 H 0.060 0.940 20 C 0.060 3.940 21 N -0.892 5.892 22 Si 0.898 3.102 23 H -0.279 1.279 24 H -0.286 1.286 25 H -0.272 1.272 26 C 0.057 3.943 27 C 0.056 3.944 28 H 0.069 0.931 29 H 0.068 0.932 30 H 0.026 0.974 31 H 0.079 0.921 32 H 0.043 0.957 33 H 0.043 0.957 34 H 0.088 0.912 35 H 0.078 0.922 36 H 0.036 0.964 37 H 0.070 0.930 38 H 0.076 0.924 39 H 0.074 0.926 40 H 0.072 0.928 41 H 0.071 0.929 42 H 0.073 0.927 43 H 0.412 0.588 44 H 0.411 0.589 45 H 0.063 0.937 46 H 0.063 0.937 47 H 0.025 0.975 48 H 0.025 0.975 49 H 0.263 0.737 50 H 0.080 0.920 51 H 0.043 0.957 52 H 0.043 0.957 53 H 0.079 0.921 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -31.097 -20.657 2.746 37.433 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 -0.123 4.123 2 N -0.272 5.272 3 C -0.073 4.073 4 C -0.078 4.078 5 N -0.266 5.266 6 C -0.071 4.071 7 C -0.158 4.158 8 C -0.169 4.169 9 C -0.005 4.005 10 N -0.361 5.361 11 C 0.288 3.712 12 O -0.396 6.396 13 C 0.276 3.724 14 O -0.413 6.413 15 N -0.337 5.337 16 C -0.003 4.003 17 C -0.027 4.027 18 C -0.563 4.563 19 H 0.078 0.922 20 C -0.142 4.142 21 N -0.531 5.531 22 Si 0.725 3.275 23 H -0.205 1.205 24 H -0.211 1.211 25 H -0.197 1.197 26 C -0.072 4.072 27 C -0.072 4.072 28 H 0.088 0.912 29 H 0.087 0.913 30 H 0.045 0.955 31 H 0.098 0.902 32 H 0.061 0.939 33 H 0.061 0.939 34 H 0.106 0.894 35 H 0.096 0.904 36 H 0.055 0.945 37 H 0.088 0.912 38 H 0.095 0.905 39 H 0.093 0.907 40 H 0.090 0.910 41 H 0.090 0.910 42 H 0.091 0.909 43 H 0.249 0.751 44 H 0.246 0.754 45 H 0.081 0.919 46 H 0.081 0.919 47 H 0.043 0.957 48 H 0.043 0.957 49 H 0.072 0.928 50 H 0.098 0.902 51 H 0.061 0.939 52 H 0.061 0.939 53 H 0.097 0.903 Dipole moment (debyes) X Y Z Total from point charges -31.061 -20.433 2.711 37.278 hybrid contribution 0.949 0.099 -0.029 0.955 sum -30.111 -20.334 2.682 36.433 Atomic orbital electron populations 1.22350 0.87021 1.02141 1.00823 1.62166 1.07988 1.14176 1.42904 1.22202 0.94706 0.89201 1.01195 1.22298 0.94144 0.99289 0.92103 1.62225 1.07696 1.13801 1.42902 1.22126 0.86631 0.96881 1.01466 1.21641 0.94173 0.96993 1.02986 1.21762 0.95915 0.96106 1.03165 1.21438 0.78872 0.97457 1.02752 1.45753 1.07367 1.11030 1.71954 1.20460 0.89076 0.84054 0.77603 1.90760 1.70094 1.31561 1.47147 1.19983 0.87678 0.85140 0.79562 1.90726 1.69717 1.31643 1.49168 1.46234 1.09591 1.09835 1.68002 1.21936 0.74854 1.02167 1.01360 1.19356 0.96611 0.88740 0.97952 1.21016 0.90716 0.94519 1.50002 0.92168 1.24996 0.98829 0.95448 0.94927 1.69958 1.35703 0.98939 1.48486 0.86501 0.85152 0.77451 0.78387 1.20544 1.21138 1.19716 1.22154 0.94339 0.89456 1.01217 1.22171 0.94546 0.98479 0.92003 0.91247 0.91332 0.95508 0.90217 0.93880 0.93905 0.89358 0.90371 0.94530 0.91167 0.90490 0.90742 0.90973 0.91033 0.90912 0.75140 0.75378 0.91852 0.91866 0.95668 0.95656 0.92767 0.90168 0.93885 0.93910 0.90280 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 0.02 0.12 9.60 60.06 0.58 0.70 16 2 N -0.55 -3.53 4.97 -242.75 -1.21 -4.74 16 3 C 0.06 0.34 5.62 -3.76 -0.02 0.32 16 4 C 0.05 0.31 4.93 -3.76 -0.02 0.29 16 5 N -0.54 -3.53 4.86 -234.46 -1.14 -4.67 16 6 C 0.06 0.32 5.28 -3.82 -0.02 0.30 16 7 C -0.12 -0.64 4.48 -26.73 -0.12 -0.76 16 8 C -0.13 -0.75 5.33 -26.73 -0.14 -0.90 16 9 C 0.12 1.01 5.67 -4.04 -0.02 0.99 16 10 N -0.71 -7.83 5.55 -60.73 -0.34 -8.17 16 11 C 0.51 7.55 7.89 -11.59 -0.09 7.46 16 12 O -0.52 -8.81 16.48 5.49 0.09 -8.72 16 13 C 0.50 8.54 7.89 -11.59 -0.09 8.45 16 14 O -0.53 -10.05 16.48 5.50 0.09 -9.96 16 15 N -0.69 -12.53 5.55 -60.73 -0.34 -12.86 16 16 C 0.12 2.48 5.61 -4.05 -0.02 2.45 16 17 C 0.01 0.27 5.09 -27.89 -0.14 0.13 16 18 C -0.52 -14.40 9.11 -34.44 -0.31 -14.72 16 19 H 0.06 1.61 7.74 -52.49 -0.41 1.20 16 20 C 0.06 1.68 5.46 -17.82 -0.10 1.58 16 21 N -0.89 -26.12 13.29 55.43 0.74 -25.38 16 22 Si 0.90 21.24 29.54 -169.99 -5.02 16.22 16 23 H -0.28 -6.53 7.11 56.52 0.40 -6.12 16 24 H -0.29 -6.70 7.11 56.52 0.40 -6.29 16 25 H -0.27 -6.32 7.11 56.52 0.40 -5.92 16 26 C 0.06 0.34 5.58 -3.77 -0.02 0.32 16 27 C 0.06 0.33 5.62 -3.76 -0.02 0.31 16 28 H 0.07 0.30 8.14 -51.93 -0.42 -0.12 16 29 H 0.07 0.28 8.13 -51.93 -0.42 -0.14 16 30 H 0.03 0.13 8.14 -51.93 -0.42 -0.30 16 31 H 0.08 0.42 8.14 -51.93 -0.42 0.00 16 32 H 0.04 0.29 8.14 -51.93 -0.42 -0.13 16 33 H 0.04 0.30 8.14 -51.93 -0.42 -0.12 16 34 H 0.09 0.49 5.99 -51.93 -0.31 0.18 16 35 H 0.08 0.43 8.14 -51.93 -0.42 0.00 16 36 H 0.04 0.21 8.08 -51.93 -0.42 -0.21 16 37 H 0.07 0.38 6.26 -51.93 -0.33 0.05 16 38 H 0.08 0.45 8.14 -51.93 -0.42 0.03 16 39 H 0.07 0.40 8.14 -51.93 -0.42 -0.02 16 40 H 0.07 0.40 8.14 -51.93 -0.42 -0.03 16 41 H 0.07 0.64 8.14 -51.93 -0.42 0.22 16 42 H 0.07 0.65 8.14 -51.93 -0.42 0.23 16 43 H 0.41 4.06 7.94 -40.82 -0.32 3.74 16 44 H 0.41 7.16 7.94 -40.82 -0.32 6.84 16 45 H 0.06 1.34 8.14 -51.93 -0.42 0.92 16 46 H 0.06 1.34 8.14 -51.93 -0.42 0.91 16 47 H 0.03 0.65 8.14 -51.93 -0.42 0.23 16 48 H 0.03 0.65 8.14 -51.93 -0.42 0.23 16 49 H 0.26 7.26 8.31 -40.82 -0.34 6.92 16 50 H 0.08 0.40 8.14 -51.93 -0.42 -0.02 16 51 H 0.04 0.28 8.14 -51.93 -0.42 -0.14 16 52 H 0.04 0.27 8.14 -51.93 -0.42 -0.15 16 53 H 0.08 0.37 8.13 -51.93 -0.42 -0.05 16 LS Contribution 426.27 15.07 6.42 6.42 Total: -1.00 -32.05 426.27 -10.97 -43.02 By element: Atomic # 1 Polarization: 11.63 SS G_CDS: -9.70 Total: 1.93 kcal Atomic # 6 Polarization: 7.47 SS G_CDS: -0.57 Total: 6.90 kcal Atomic # 7 Polarization: -53.53 SS G_CDS: -2.28 Total: -55.82 kcal Atomic # 8 Polarization: -18.86 SS G_CDS: 0.18 Total: -18.68 kcal Atomic # 14 Polarization: 21.24 SS G_CDS: -5.02 Total: 16.22 kcal Total LS contribution 6.42 Total: 6.42 kcal Total: -32.05 -10.97 -43.02 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. ZINC001117022621.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 -32.091 kcal (2) G-P(sol) polarization free energy of solvation -32.050 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -64.141 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.967 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -43.017 kcal (6) G-S(sol) free energy of system = (1) + (5) -75.108 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.80 seconds