Wall clock time and date at job start Tue Mar 31 2020 19:18:47 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 1.53002 * 1 3 3 C 1.52992 * 109.47480 * 2 1 4 4 C 1.53007 * 109.47298 * 180.02562 * 3 2 1 5 5 C 1.52999 * 109.46830 * 180.02562 * 4 3 2 6 6 H 1.09000 * 110.02020 * 53.61204 * 5 4 3 7 7 C 1.54266 * 110.03353 * 292.16465 * 5 4 3 8 8 C 1.54895 * 104.19710 * 217.11078 * 7 5 4 9 9 C 1.54893 * 102.74761 * 37.93748 * 8 7 5 10 10 C 1.53873 * 110.02858 * 174.99905 * 5 4 3 11 11 H 1.08998 * 110.03247 * 359.97438 * 10 5 4 12 12 N 1.46498 * 110.03385 * 238.61839 * 10 5 4 13 13 C 1.34776 * 120.00343 * 155.00168 * 12 10 5 14 14 O 1.21343 * 119.99894 * 359.97438 * 13 12 10 15 15 C 1.49448 * 120.00211 * 179.97438 * 13 12 10 16 16 O 1.21354 * 120.00194 * 354.86810 * 15 13 12 17 17 N 1.34777 * 120.00248 * 174.86032 * 15 13 12 18 18 C 1.46497 * 120.00061 * 184.87609 * 17 15 13 19 19 C 1.53000 * 109.46778 * 185.62608 * 18 17 15 20 20 C 1.50696 * 115.55465 * 32.55884 * 19 18 17 21 21 H 1.08003 * 120.00224 * 267.33298 * 20 19 18 22 22 C 1.37883 * 119.99814 * 87.33120 * 20 19 18 23 23 N 1.31514 * 119.99726 * 178.80647 * 22 20 19 24 24 Si 1.86797 * 120.00079 * 358.79897 * 22 20 19 25 25 H 1.48503 * 109.46913 * 91.25153 * 24 22 20 26 26 H 1.48499 * 109.47151 * 211.25101 * 24 22 20 27 27 H 1.48498 * 109.47131 * 331.25082 * 24 22 20 28 28 C 1.53005 * 117.49768 * 246.84878 * 19 18 17 29 29 C 1.53007 * 60.00082 * 252.51161 * 28 19 18 30 30 H 1.09003 * 109.47249 * 180.02562 * 1 2 3 31 31 H 1.08996 * 109.46822 * 300.00163 * 1 2 3 32 32 H 1.08997 * 109.46894 * 59.99803 * 1 2 3 33 33 H 1.09006 * 109.46906 * 239.99805 * 2 1 3 34 34 H 1.09005 * 109.47286 * 120.00711 * 2 1 3 35 35 H 1.08996 * 109.47226 * 60.00084 * 3 2 1 36 36 H 1.09007 * 109.47235 * 300.00116 * 3 2 1 37 37 H 1.08997 * 109.46857 * 60.00204 * 4 3 2 38 38 H 1.08997 * 109.46748 * 299.99996 * 4 3 2 39 39 H 1.08999 * 110.48717 * 335.78440 * 7 5 4 40 40 H 1.08993 * 110.48762 * 98.43300 * 7 5 4 41 41 H 1.09005 * 110.75205 * 279.62755 * 8 7 5 42 42 H 1.08992 * 110.91480 * 156.33303 * 8 7 5 43 43 H 1.08993 * 110.48472 * 203.37822 * 9 8 7 44 44 H 1.09005 * 110.48028 * 80.74178 * 9 8 7 45 45 H 0.97004 * 119.99819 * 334.99548 * 12 10 5 46 46 H 0.97002 * 119.99837 * 4.88302 * 17 15 13 47 47 H 1.08997 * 109.47201 * 305.62392 * 18 17 15 48 48 H 1.09003 * 109.47306 * 65.62769 * 18 17 15 49 49 H 0.97004 * 120.00006 * 180.02562 * 23 22 20 50 50 H 1.09001 * 117.49885 * 0.02562 * 28 19 18 51 51 H 1.08999 * 117.49587 * 145.02720 * 28 19 18 52 52 H 1.08995 * 117.49795 * 252.51258 * 29 28 19 53 53 H 1.08996 * 117.51383 * 107.48013 * 29 28 19 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 2.0401 1.4424 0.0000 4 6 3.5702 1.4423 -0.0006 5 6 4.0801 2.8848 0.0000 6 1 3.6320 3.4387 0.8250 7 6 3.7402 3.5661 -1.3417 8 6 4.9685 4.4633 -1.6341 9 6 6.1522 3.5925 -1.1444 10 6 5.6136 2.9016 0.1254 11 1 5.9945 1.8821 0.1862 12 7 6.0116 3.6569 1.3159 13 6 7.1946 3.4042 1.9101 14 8 7.9300 2.5507 1.4592 15 6 7.6009 4.1751 3.1242 16 8 6.9104 5.0909 3.5207 17 7 8.7340 3.8531 3.7791 18 6 9.0776 4.5369 5.0283 19 6 10.4668 4.0905 5.4885 20 6 11.4418 3.7616 4.3875 21 1 11.5328 2.7457 4.0324 22 6 12.2176 4.7577 3.8334 23 7 13.0853 4.4667 2.8889 24 14 12.0362 6.5205 4.4241 25 1 12.9920 6.7719 5.5326 26 1 12.3233 7.4505 3.3025 27 1 10.6493 6.7405 4.9070 28 6 10.5547 3.2722 6.7783 29 6 11.0276 4.7272 6.7618 30 1 -0.3634 -1.0277 0.0005 31 1 -0.3633 0.5138 0.8899 32 1 -0.3633 0.5139 -0.8900 33 1 1.8933 -0.5139 -0.8900 34 1 1.8934 -0.5140 0.8900 35 1 1.6768 1.9562 0.8899 36 1 1.6768 1.9563 -0.8900 37 1 3.9330 0.9287 -0.8909 38 1 3.9338 0.9284 0.8891 39 1 3.6165 2.8209 -2.1274 40 1 2.8396 4.1723 -1.2443 41 1 4.9119 5.3925 -1.0668 42 1 5.0552 4.6686 -2.7010 43 1 7.0116 4.2179 -0.9032 44 1 6.4180 2.8515 -1.8984 45 1 5.4237 4.3390 1.6765 46 1 9.3221 3.1688 3.4231 47 1 9.0779 5.6145 4.8645 48 1 8.3432 4.2859 5.7938 49 1 13.6314 5.1674 2.4993 50 1 9.6227 3.0514 7.2987 51 1 11.3177 2.4956 6.8306 52 1 12.1017 4.9077 6.8032 53 1 10.4070 5.4642 7.2713 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 ZINC001324123501.mol2 53 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 19:18:47 Heat of formation + Delta-G solvation = -80.545386 kcal Electronic energy + Delta-G solvation = -29475.721305 eV Core-core repulsion = 25539.722388 eV Total energy + Delta-G solvation = -3935.998917 eV No. of doubly occupied orbitals = 65 Molecular weight (most abundant/longest-lived isotopes) = 336.220 amu Computer time = 0.80 seconds Orbital eigenvalues (eV) -40.47487 -39.13379 -37.85113 -37.01002 -35.73714 -33.99329 -33.06263 -32.18418 -31.58307 -28.36151 -27.46475 -27.03923 -25.52877 -23.91738 -22.76389 -21.72969 -21.54012 -20.85276 -20.12542 -19.65318 -19.22219 -17.82352 -16.79576 -16.28700 -16.00739 -15.81155 -15.55466 -15.18423 -15.05837 -14.65851 -14.35017 -14.13714 -14.05453 -13.74290 -13.68000 -13.22165 -12.97879 -12.80511 -12.56468 -12.45280 -12.35466 -12.34595 -11.97402 -11.66686 -11.43119 -11.32619 -11.24697 -11.17343 -11.05618 -10.91794 -10.84754 -10.76659 -10.71554 -10.62037 -10.53408 -10.24215 -9.68366 -9.30989 -9.11727 -9.06432 -8.75603 -8.63797 -8.28448 -6.19278 -4.25669 1.85109 2.74568 3.25723 3.36252 3.39918 3.64180 4.07682 4.17890 4.36272 4.36476 4.48159 4.66931 4.71458 4.79240 4.81922 4.99852 5.03084 5.14957 5.15207 5.19876 5.22011 5.32761 5.40329 5.44041 5.46646 5.52414 5.56067 5.66360 5.67258 5.72370 5.75736 5.81437 5.83029 5.92594 5.96394 6.00135 6.04079 6.06337 6.10425 6.15535 6.18155 6.40389 6.43602 6.48714 6.65723 6.80084 7.00562 7.05353 7.31882 7.63460 7.92071 8.22749 8.36817 8.58267 8.81826 9.43098 10.91223 Molecular weight = 336.22amu Principal moments of inertia in cm(-1) A = 0.016762 B = 0.002418 C = 0.002267 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1670.061200 B =11578.384765 C =12346.960529 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.153 4.153 2 C -0.127 4.127 3 C -0.119 4.119 4 C -0.113 4.113 5 C -0.098 4.098 6 H 0.081 0.919 7 C -0.117 4.117 8 C -0.127 4.127 9 C -0.136 4.136 10 C 0.142 3.858 11 H 0.095 0.905 12 N -0.701 5.701 13 C 0.508 3.492 14 O -0.512 6.512 15 C 0.495 3.505 16 O -0.548 6.548 17 N -0.658 5.658 18 C 0.147 3.853 19 C -0.018 4.018 20 C -0.497 4.497 21 H 0.082 0.918 22 C 0.084 3.916 23 N -0.888 5.888 24 Si 0.878 3.122 25 H -0.277 1.277 26 H -0.294 1.294 27 H -0.256 1.256 28 C -0.177 4.177 29 C -0.194 4.194 30 H 0.052 0.948 31 H 0.053 0.947 32 H 0.052 0.948 33 H 0.060 0.940 34 H 0.061 0.939 35 H 0.061 0.939 36 H 0.063 0.937 37 H 0.066 0.934 38 H 0.065 0.935 39 H 0.070 0.930 40 H 0.066 0.934 41 H 0.067 0.933 42 H 0.067 0.933 43 H 0.073 0.927 44 H 0.076 0.924 45 H 0.409 0.591 46 H 0.424 0.576 47 H 0.069 0.931 48 H 0.053 0.947 49 H 0.266 0.734 50 H 0.074 0.926 51 H 0.088 0.912 52 H 0.090 0.910 53 H 0.074 0.926 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -22.198 -4.076 -7.018 23.635 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 -0.210 4.210 2 C -0.164 4.164 3 C -0.156 4.156 4 C -0.150 4.150 5 C -0.117 4.117 6 H 0.099 0.901 7 C -0.154 4.154 8 C -0.164 4.164 9 C -0.174 4.174 10 C 0.038 3.962 11 H 0.113 0.887 12 N -0.355 5.355 13 C 0.289 3.711 14 O -0.386 6.386 15 C 0.274 3.726 16 O -0.428 6.428 17 N -0.310 5.310 18 C 0.024 3.976 19 C -0.019 4.019 20 C -0.534 4.534 21 H 0.100 0.900 22 C -0.120 4.120 23 N -0.524 5.524 24 Si 0.706 3.294 25 H -0.203 1.203 26 H -0.221 1.221 27 H -0.180 1.180 28 C -0.214 4.214 29 C -0.232 4.232 30 H 0.071 0.929 31 H 0.072 0.928 32 H 0.072 0.928 33 H 0.079 0.921 34 H 0.080 0.920 35 H 0.080 0.920 36 H 0.082 0.918 37 H 0.085 0.915 38 H 0.083 0.917 39 H 0.088 0.912 40 H 0.085 0.915 41 H 0.086 0.914 42 H 0.086 0.914 43 H 0.091 0.909 44 H 0.094 0.906 45 H 0.245 0.755 46 H 0.264 0.736 47 H 0.087 0.913 48 H 0.071 0.929 49 H 0.076 0.924 50 H 0.092 0.908 51 H 0.107 0.893 52 H 0.109 0.891 53 H 0.093 0.907 Dipole moment (debyes) X Y Z Total from point charges -21.959 -4.024 -7.171 23.448 hybrid contribution 0.162 1.101 0.297 1.152 sum -21.798 -2.923 -6.874 23.042 Atomic orbital electron populations 1.21777 0.96026 1.01501 1.01729 1.21546 0.95731 0.97065 1.02071 1.21629 0.95199 0.96684 1.02132 1.21708 0.95477 0.95326 1.02513 1.22100 0.93723 0.97077 0.98818 0.90108 1.22446 0.98048 0.98590 0.96356 1.22531 0.94513 0.98324 1.01040 1.22795 0.98406 0.99415 0.96798 1.21755 0.93795 0.96565 0.84133 0.88701 1.45906 1.19851 1.40546 1.29230 1.20402 0.82194 0.83693 0.84852 1.90781 1.51244 1.32095 1.64455 1.20010 0.83102 0.84810 0.84665 1.90690 1.54063 1.30125 1.67919 1.45899 1.21027 1.40177 1.23938 1.21226 0.95899 0.96751 0.83740 1.19608 0.93342 1.00171 0.88824 1.20155 1.19298 0.96799 1.17171 0.90042 1.24981 0.94063 0.98936 0.94035 1.69892 1.22845 1.33747 1.25874 0.86888 0.79749 0.84672 0.78111 1.20337 1.22075 1.18030 1.22925 1.01419 0.93984 1.03095 1.22961 1.00823 0.95535 1.03865 0.92898 0.92798 0.92842 0.92074 0.92026 0.92033 0.91849 0.91510 0.91668 0.91172 0.91492 0.91420 0.91429 0.90860 0.90580 0.75478 0.73584 0.91334 0.92927 0.92385 0.90781 0.89314 0.89145 0.90707 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 -0.90 9.91 37.16 0.37 -0.53 16 2 C -0.13 -0.82 5.93 -26.73 -0.16 -0.98 16 3 C -0.12 -0.78 5.07 -26.73 -0.14 -0.92 16 4 C -0.11 -0.85 4.34 -26.73 -0.12 -0.96 16 5 C -0.10 -0.80 2.70 -89.50 -0.24 -1.04 16 6 H 0.08 0.66 7.62 -51.93 -0.40 0.26 16 7 C -0.12 -0.84 5.53 -25.07 -0.14 -0.97 16 8 C -0.13 -1.07 6.91 -24.73 -0.17 -1.24 16 9 C -0.14 -1.45 6.54 -25.07 -0.16 -1.62 16 10 C 0.14 1.57 2.90 -66.81 -0.19 1.37 16 11 H 0.09 1.17 7.09 -51.93 -0.37 0.81 16 12 N -0.70 -9.25 5.02 -53.16 -0.27 -9.51 16 13 C 0.51 8.76 7.88 -11.59 -0.09 8.66 16 14 O -0.51 -10.09 16.14 5.50 0.09 -10.00 16 15 C 0.49 9.55 7.88 -11.59 -0.09 9.46 16 16 O -0.55 -11.09 16.46 5.49 0.09 -11.00 16 17 N -0.66 -13.61 5.28 -60.73 -0.32 -13.93 16 18 C 0.15 3.07 5.63 -4.04 -0.02 3.05 16 19 C -0.02 -0.40 1.24 -155.66 -0.19 -0.59 16 20 C -0.50 -13.01 7.79 -34.44 -0.27 -13.28 16 21 H 0.08 2.32 8.06 -52.48 -0.42 1.90 16 22 C 0.08 2.32 5.47 -17.82 -0.10 2.23 16 23 N -0.89 -26.21 13.96 55.43 0.77 -25.44 16 24 Si 0.88 21.36 25.16 -169.99 -4.28 17.08 16 25 H -0.28 -6.59 7.11 56.52 0.40 -6.19 16 26 H -0.29 -7.31 7.11 56.52 0.40 -6.91 16 27 H -0.26 -5.96 5.30 56.52 0.30 -5.66 16 28 C -0.18 -3.40 9.88 -26.72 -0.26 -3.67 16 29 C -0.19 -3.93 7.60 -26.72 -0.20 -4.14 16 30 H 0.05 0.29 8.14 -51.93 -0.42 -0.13 16 31 H 0.05 0.32 8.14 -51.93 -0.42 -0.11 16 32 H 0.05 0.30 8.14 -51.93 -0.42 -0.13 16 33 H 0.06 0.39 8.14 -51.93 -0.42 -0.04 16 34 H 0.06 0.42 8.14 -51.93 -0.42 0.00 16 35 H 0.06 0.42 8.14 -51.93 -0.42 0.00 16 36 H 0.06 0.39 7.51 -51.92 -0.39 0.00 16 37 H 0.07 0.49 8.00 -51.93 -0.42 0.07 16 38 H 0.06 0.55 8.14 -51.93 -0.42 0.13 16 39 H 0.07 0.47 7.76 -51.93 -0.40 0.06 16 40 H 0.07 0.43 8.14 -51.93 -0.42 0.01 16 41 H 0.07 0.60 8.14 -51.93 -0.42 0.18 16 42 H 0.07 0.52 8.14 -51.93 -0.42 0.10 16 43 H 0.07 0.95 8.04 -51.93 -0.42 0.54 16 44 H 0.08 0.76 8.14 -51.93 -0.42 0.34 16 45 H 0.41 4.89 7.80 -40.82 -0.32 4.57 16 46 H 0.42 9.22 6.76 -40.82 -0.28 8.95 16 47 H 0.07 1.52 6.38 -51.93 -0.33 1.19 16 48 H 0.05 0.99 7.89 -51.93 -0.41 0.58 16 49 H 0.27 7.46 8.31 -40.82 -0.34 7.12 16 50 H 0.07 1.25 8.04 -51.93 -0.42 0.83 16 51 H 0.09 1.72 8.14 -51.93 -0.42 1.30 16 52 H 0.09 1.93 7.22 -51.93 -0.37 1.55 16 53 H 0.07 1.37 8.14 -51.93 -0.42 0.94 16 LS Contribution 417.06 15.07 6.29 6.29 Total: -1.00 -29.97 417.06 -9.48 -39.45 By element: Atomic # 1 Polarization: 21.92 SS G_CDS: -9.67 Total: 12.25 kcal Atomic # 6 Polarization: -3.00 SS G_CDS: -2.18 Total: -5.18 kcal Atomic # 7 Polarization: -49.07 SS G_CDS: 0.19 Total: -48.88 kcal Atomic # 8 Polarization: -21.18 SS G_CDS: 0.18 Total: -21.00 kcal Atomic # 14 Polarization: 21.36 SS G_CDS: -4.28 Total: 17.08 kcal Total LS contribution 6.29 Total: 6.29 kcal Total: -29.97 -9.48 -39.45 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. ZINC001324123501.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 -41.096 kcal (2) G-P(sol) polarization free energy of solvation -29.968 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -71.064 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -9.481 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -39.450 kcal (6) G-S(sol) free energy of system = (1) + (5) -80.545 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.80 seconds