Wall clock time and date at job start Tue Mar 31 2020 23:09:37 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 1.52993 * 1 3 3 C 1.53003 * 109.47197 * 2 1 4 4 C 1.53004 * 109.46989 * 120.00176 * 2 1 3 5 5 C 1.53002 * 109.46894 * 173.71346 * 4 2 1 6 6 C 1.53001 * 110.54215 * 323.09757 * 5 4 2 7 7 C 1.54223 * 110.60462 * 200.24725 * 5 4 2 8 8 C 1.51315 * 103.55621 * 241.48338 * 7 5 4 9 9 O 1.21233 * 125.39504 * 179.97438 * 8 7 5 10 10 N 1.33877 * 109.20672 * 0.02562 * 8 7 5 11 11 C 1.46497 * 122.76267 * 180.02562 * 10 8 7 12 12 C 1.53000 * 109.47197 * 269.97602 * 11 10 8 13 13 H 1.09003 * 109.47169 * 59.99922 * 12 11 10 14 14 O 1.42903 * 109.46913 * 300.00211 * 12 11 10 15 15 C 1.52994 * 109.47116 * 179.97438 * 12 11 10 16 16 N 1.46904 * 109.47187 * 180.52872 * 15 12 11 17 17 C 1.46899 * 111.00135 * 199.88591 * 16 15 12 18 18 C 1.46898 * 111.00127 * 75.93143 * 16 15 12 19 19 C 1.50697 * 109.46826 * 190.00467 * 18 16 15 20 20 H 1.08001 * 120.00530 * 359.97438 * 19 18 16 21 21 C 1.37887 * 119.99811 * 179.97438 * 19 18 16 22 22 N 1.31510 * 119.99909 * 0.02562 * 21 19 18 23 23 Si 1.86797 * 120.00230 * 179.97438 * 21 19 18 24 24 H 1.48498 * 109.47221 * 89.99835 * 23 21 19 25 25 H 1.48497 * 109.47287 * 210.00148 * 23 21 19 26 26 H 1.48506 * 109.47055 * 330.00116 * 23 21 19 27 27 C 1.33873 * 114.47456 * 359.97438 * 10 8 7 28 28 O 1.21226 * 125.39644 * 179.97438 * 27 10 8 29 29 H 1.09005 * 109.47372 * 299.99848 * 1 2 3 30 30 H 1.09008 * 109.47277 * 60.00366 * 1 2 3 31 31 H 1.09000 * 109.47457 * 179.97438 * 1 2 3 32 32 H 1.09005 * 109.47372 * 240.00152 * 2 1 3 33 33 H 1.08993 * 109.47223 * 196.79106 * 3 2 1 34 34 H 1.08997 * 109.46979 * 316.79525 * 3 2 1 35 35 H 1.08997 * 109.46900 * 76.79425 * 3 2 1 36 36 H 1.08994 * 109.47301 * 53.71614 * 4 2 1 37 37 H 1.09001 * 109.47079 * 293.71059 * 4 2 1 38 38 H 1.09000 * 109.46632 * 297.85080 * 6 5 4 39 39 H 1.08991 * 109.47333 * 57.84947 * 6 5 4 40 40 H 1.09007 * 109.47040 * 177.85663 * 6 5 4 41 41 H 1.09006 * 110.60905 * 359.97438 * 7 5 4 42 42 H 1.08999 * 110.60682 * 122.96509 * 7 5 4 43 43 H 1.09007 * 109.46838 * 29.97529 * 11 10 8 44 44 H 1.09003 * 109.47124 * 149.97497 * 11 10 8 45 45 H 0.96701 * 114.00001 * 299.99733 * 14 12 11 46 46 H 1.09000 * 109.47278 * 300.52295 * 15 12 11 47 47 H 1.08996 * 109.47464 * 60.52912 * 15 12 11 48 48 H 1.09006 * 109.47331 * 64.77715 * 17 16 15 49 49 H 1.08998 * 109.47215 * 184.77116 * 17 16 15 50 50 H 1.08998 * 109.47394 * 304.77814 * 17 16 15 51 51 H 1.09001 * 109.46796 * 309.99687 * 18 16 15 52 52 H 1.08992 * 109.47316 * 69.99943 * 18 16 15 53 53 H 0.96997 * 120.00373 * 180.02562 * 22 21 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 1.5299 0.0000 0.0000 3 6 2.0400 1.4425 0.0000 4 6 2.0399 -0.7213 1.2493 5 6 3.5618 -0.8595 1.1728 6 6 4.0048 -1.1280 -0.2669 7 6 4.0526 -1.9817 2.1099 8 6 4.9538 -1.2588 3.0872 9 8 5.5532 -1.7768 4.0048 10 7 4.9832 0.0436 2.7786 11 6 5.7686 1.0204 3.5369 12 6 4.9143 1.5925 4.6700 13 1 4.6012 0.7852 5.3321 14 8 3.7607 2.2322 4.1203 15 6 5.7347 2.6122 5.4623 16 7 4.9186 3.1522 6.5579 17 6 5.4611 4.4300 7.0382 18 6 4.8038 2.1831 7.6559 19 6 3.7711 2.6627 8.6432 20 1 3.2523 3.5943 8.4723 21 6 3.4886 1.9119 9.7647 22 7 4.1207 0.7776 9.9730 23 14 2.2091 2.5066 10.9889 24 1 0.8745 1.9806 10.6049 25 1 2.5605 2.0208 12.3474 26 1 2.1751 3.9912 10.9874 27 6 4.2368 0.3795 1.7192 28 8 4.1197 1.4992 1.2695 29 1 -0.3634 0.5138 0.8900 30 1 -0.3634 0.5138 -0.8901 31 1 -0.3634 -1.0276 -0.0005 32 1 1.8933 -0.5138 -0.8900 33 1 3.0886 1.4571 -0.2969 34 1 1.4548 2.0347 -0.7035 35 1 1.9397 1.8633 1.0005 36 1 1.5877 -1.7113 1.3073 37 1 1.7714 -0.1466 2.1357 38 1 3.5781 -2.0711 -0.6084 39 1 3.6593 -0.3189 -0.9102 40 1 5.0926 -1.1855 -0.3076 41 1 3.2126 -2.4412 2.6311 42 1 4.6147 -2.7298 1.5510 43 1 6.6485 0.5324 3.9561 44 1 6.0817 1.8277 2.8747 45 1 3.9644 2.9624 3.5200 46 1 6.6192 2.1260 5.8738 47 1 6.0402 3.4243 4.8026 48 1 5.3917 5.1752 6.2456 49 1 4.8891 4.7655 7.9033 50 1 6.5052 4.2978 7.3220 51 1 4.5020 1.2151 7.2560 52 1 5.7670 2.0852 8.1564 53 1 3.9218 0.2493 10.7618 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 ZINC000414153089.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 23:09:37 Heat of formation + Delta-G solvation = -113.591239 kcal Electronic energy + Delta-G solvation = -32047.312450 eV Core-core repulsion = 27919.424505 eV Total energy + Delta-G solvation = -4127.887944 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.220 amu Computer time = 0.81 seconds Orbital eigenvalues (eV) -42.31831 -38.93771 -38.07677 -37.08652 -35.92976 -35.36646 -33.67909 -32.46530 -30.51609 -28.59635 -27.42814 -27.27920 -27.02349 -26.37504 -24.41335 -23.63177 -22.18746 -21.48497 -20.25391 -20.03542 -18.93374 -17.33397 -16.88505 -16.52012 -16.36146 -15.83235 -15.48878 -15.31801 -15.10615 -14.64495 -14.58661 -14.43913 -14.14116 -14.06501 -14.05471 -13.58874 -13.36736 -12.95901 -12.71295 -12.65927 -12.59495 -12.34516 -12.16696 -12.01591 -11.92607 -11.78509 -11.45049 -11.43195 -11.22215 -11.04440 -10.89644 -10.88735 -10.79386 -10.64406 -10.60409 -10.39065 -10.29255 -10.13309 -9.74947 -9.67435 -9.33564 -9.08494 -8.39496 -7.20281 -5.98626 -3.99522 1.48670 2.41743 2.69367 3.35262 3.40704 3.44421 3.78338 4.01630 4.10053 4.32723 4.44284 4.60466 4.68465 4.75638 4.81029 4.87660 5.04017 5.06505 5.17448 5.20742 5.26829 5.32773 5.37007 5.37946 5.44124 5.49442 5.53973 5.56033 5.60754 5.62787 5.67082 5.73486 5.84160 5.92082 5.93910 6.00771 6.07673 6.13409 6.27056 6.32559 6.36704 6.53294 6.74166 6.81230 7.28970 7.31553 7.33927 7.76326 7.82424 8.06489 8.12259 8.22676 8.57413 9.07643 9.64125 11.12397 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.012599 B = 0.003008 C = 0.002922 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2221.841961 B = 9306.161944 C = 9580.904761 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 -0.100 4.100 3 C -0.154 4.154 4 C -0.097 4.097 5 C -0.093 4.093 6 C -0.138 4.138 7 C -0.153 4.153 8 C 0.524 3.476 9 O -0.477 6.477 10 N -0.563 5.563 11 C 0.065 3.935 12 C 0.103 3.897 13 H 0.106 0.894 14 O -0.535 6.535 15 C 0.029 3.971 16 N -0.530 5.530 17 C 0.038 3.962 18 C 0.193 3.807 19 C -0.505 4.505 20 H 0.063 0.937 21 C 0.054 3.946 22 N -0.899 5.899 23 Si 0.898 3.102 24 H -0.280 1.280 25 H -0.288 1.288 26 H -0.274 1.274 27 C 0.540 3.460 28 O -0.465 6.465 29 H 0.056 0.944 30 H 0.053 0.947 31 H 0.051 0.949 32 H 0.075 0.925 33 H 0.080 0.920 34 H 0.040 0.960 35 H 0.060 0.940 36 H 0.078 0.922 37 H 0.075 0.925 38 H 0.074 0.926 39 H 0.080 0.920 40 H 0.058 0.942 41 H 0.122 0.878 42 H 0.119 0.881 43 H 0.099 0.901 44 H 0.094 0.906 45 H 0.366 0.634 46 H 0.035 0.965 47 H 0.063 0.937 48 H 0.044 0.956 49 H 0.077 0.923 50 H 0.008 0.992 51 H 0.029 0.971 52 H -0.011 1.011 53 H 0.261 0.739 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 0.092 -4.595 -24.433 24.861 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 -0.205 4.205 2 C -0.118 4.118 3 C -0.211 4.211 4 C -0.134 4.134 5 C -0.096 4.096 6 C -0.195 4.195 7 C -0.192 4.192 8 C 0.312 3.688 9 O -0.348 6.348 10 N -0.305 5.305 11 C -0.057 4.057 12 C 0.042 3.958 13 H 0.124 0.876 14 O -0.338 6.338 15 C -0.101 4.101 16 N -0.254 5.254 17 C -0.110 4.110 18 C 0.068 3.932 19 C -0.544 4.544 20 H 0.081 0.919 21 C -0.147 4.147 22 N -0.538 5.538 23 Si 0.726 3.274 24 H -0.206 1.206 25 H -0.214 1.214 26 H -0.199 1.199 27 C 0.328 3.672 28 O -0.336 6.336 29 H 0.075 0.925 30 H 0.072 0.928 31 H 0.070 0.930 32 H 0.093 0.907 33 H 0.098 0.902 34 H 0.059 0.941 35 H 0.079 0.921 36 H 0.097 0.903 37 H 0.094 0.906 38 H 0.093 0.907 39 H 0.099 0.901 40 H 0.077 0.923 41 H 0.140 0.860 42 H 0.137 0.863 43 H 0.117 0.883 44 H 0.112 0.888 45 H 0.212 0.788 46 H 0.053 0.947 47 H 0.081 0.919 48 H 0.063 0.937 49 H 0.096 0.904 50 H 0.027 0.973 51 H 0.047 0.953 52 H 0.007 0.993 53 H 0.070 0.930 Dipole moment (debyes) X Y Z Total from point charges -0.389 -4.746 -23.830 24.301 hybrid contribution 0.585 0.425 0.998 1.232 sum 0.196 -4.321 -22.832 23.238 Atomic orbital electron populations 1.21861 0.95305 1.01416 1.01965 1.21287 0.95577 0.97482 0.97498 1.22303 1.02202 0.94377 1.02206 1.21679 0.90092 1.01901 0.99753 1.21474 0.98224 0.92470 0.97480 1.21934 1.01356 1.03451 0.92768 1.22743 1.01027 0.98624 0.96836 1.20828 0.81130 0.82065 0.84745 1.90820 1.43853 1.70694 1.29452 1.46625 1.43908 1.10433 1.29524 1.22619 0.95342 0.92448 0.95299 1.22229 0.86418 0.95357 0.91835 0.87615 1.86661 1.31010 1.50885 1.65290 1.22581 0.94765 0.97162 0.95597 1.62008 1.47647 1.04978 1.10760 1.22225 0.96832 0.91788 1.00200 1.19767 0.95720 0.90743 0.87004 1.21145 1.21192 1.07116 1.04911 0.91857 1.24994 0.96578 0.94987 0.98107 1.69961 1.42135 1.13529 1.28213 0.86499 0.81732 0.78965 0.80219 1.20625 1.21353 1.19872 1.20555 0.77390 0.90609 0.78605 1.90712 1.59093 1.23400 1.60423 0.92531 0.92752 0.92953 0.90697 0.90178 0.94124 0.92135 0.90319 0.90599 0.90674 0.90099 0.92284 0.86039 0.86275 0.88267 0.88799 0.78799 0.94674 0.91889 0.93706 0.90393 0.97341 0.95279 0.99308 0.92957 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 -0.15 -1.13 9.12 37.15 0.34 -0.80 16 2 C -0.10 -0.79 2.39 -90.62 -0.22 -1.01 16 3 C -0.15 -1.52 7.26 37.16 0.27 -1.25 16 4 C -0.10 -0.80 4.10 -26.73 -0.11 -0.91 16 5 C -0.09 -0.77 0.71 -154.72 -0.11 -0.88 16 6 C -0.14 -0.83 7.29 37.16 0.27 -0.56 16 7 C -0.15 -1.26 6.28 -26.94 -0.17 -1.43 16 8 C 0.52 6.78 8.08 -11.08 -0.09 6.69 16 9 O -0.48 -8.02 17.48 5.60 0.10 -7.93 16 10 N -0.56 -7.14 2.49 -115.34 -0.29 -7.43 16 11 C 0.06 0.86 5.25 -4.04 -0.02 0.84 16 12 C 0.10 1.74 3.30 -26.73 -0.09 1.65 16 13 H 0.11 2.21 6.78 -51.93 -0.35 1.86 16 14 O -0.54 -9.36 12.32 -35.23 -0.43 -9.79 16 15 C 0.03 0.51 4.66 -3.82 -0.02 0.49 16 16 N -0.53 -11.70 4.56 -244.38 -1.11 -12.81 16 17 C 0.04 0.76 9.36 60.06 0.56 1.32 16 18 C 0.19 5.18 4.55 -4.98 -0.02 5.16 16 19 C -0.51 -14.65 8.39 -34.44 -0.29 -14.94 16 20 H 0.06 1.82 7.16 -52.49 -0.38 1.45 16 21 C 0.05 1.59 5.46 -17.82 -0.10 1.49 16 22 N -0.90 -27.45 13.29 55.43 0.74 -26.71 16 23 Si 0.90 22.25 29.54 -169.99 -5.02 17.23 16 24 H -0.28 -6.89 7.11 56.52 0.40 -6.49 16 25 H -0.29 -7.02 7.11 56.52 0.40 -6.62 16 26 H -0.27 -6.63 7.11 56.52 0.40 -6.22 16 27 C 0.54 6.18 5.95 -11.09 -0.07 6.11 16 28 O -0.47 -5.92 12.07 5.60 0.07 -5.86 16 29 H 0.06 0.49 8.14 -51.93 -0.42 0.07 16 30 H 0.05 0.39 8.14 -51.92 -0.42 -0.03 16 31 H 0.05 0.35 8.14 -51.93 -0.42 -0.08 16 32 H 0.07 0.49 6.03 -51.93 -0.31 0.18 16 33 H 0.08 0.84 4.49 -51.93 -0.23 0.60 16 34 H 0.04 0.38 8.03 -51.93 -0.42 -0.04 16 35 H 0.06 0.74 7.16 -51.93 -0.37 0.37 16 36 H 0.08 0.51 7.84 -51.93 -0.41 0.10 16 37 H 0.08 0.82 7.81 -51.93 -0.41 0.41 16 38 H 0.07 0.31 8.14 -51.93 -0.42 -0.11 16 39 H 0.08 0.52 4.98 -51.93 -0.26 0.26 16 40 H 0.06 0.35 8.14 -51.93 -0.42 -0.08 16 41 H 0.12 0.90 7.59 -51.93 -0.39 0.50 16 42 H 0.12 0.69 7.74 -51.93 -0.40 0.29 16 43 H 0.10 1.30 7.83 -51.93 -0.41 0.89 16 44 H 0.09 1.07 7.83 -51.93 -0.41 0.67 16 45 H 0.37 5.38 8.92 45.56 0.41 5.79 16 46 H 0.04 0.63 8.00 -51.93 -0.42 0.21 16 47 H 0.06 0.94 7.94 -51.93 -0.41 0.52 16 48 H 0.04 0.76 8.14 -51.93 -0.42 0.33 16 49 H 0.08 1.68 6.67 -51.93 -0.35 1.33 16 50 H 0.01 0.16 8.13 -51.93 -0.42 -0.27 16 51 H 0.03 0.85 6.63 -51.93 -0.34 0.50 16 52 H -0.01 -0.31 8.12 -51.93 -0.42 -0.73 16 53 H 0.26 7.53 8.31 -40.82 -0.34 7.19 16 LS Contribution 408.03 15.07 6.15 6.15 Total: -1.00 -34.30 408.03 -8.03 -42.33 By element: Atomic # 1 Polarization: 11.22 SS G_CDS: -8.37 Total: 2.85 kcal Atomic # 6 Polarization: 1.83 SS G_CDS: 0.14 Total: 1.97 kcal Atomic # 7 Polarization: -46.29 SS G_CDS: -0.67 Total: -46.95 kcal Atomic # 8 Polarization: -23.31 SS G_CDS: -0.27 Total: -23.57 kcal Atomic # 14 Polarization: 22.25 SS G_CDS: -5.02 Total: 17.23 kcal Total LS contribution 6.15 Total: 6.15 kcal Total: -34.30 -8.03 -42.33 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. ZINC000414153089.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 -71.264 kcal (2) G-P(sol) polarization free energy of solvation -34.296 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -105.560 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -8.031 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -42.327 kcal (6) G-S(sol) free energy of system = (1) + (5) -113.591 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.81 seconds