Wall clock time and date at job start Sat Apr 11 2020 06:13:03 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 * 109.47076 * 2 1 4 4 N 1.46502 * 109.47046 * 179.97438 * 3 2 1 5 5 C 1.34776 * 119.99954 * 180.02562 * 4 3 2 6 6 O 1.21592 * 120.00076 * 0.02562 * 5 4 3 7 7 N 1.34780 * 120.00025 * 180.02562 * 5 4 3 8 8 C 1.46502 * 120.00051 * 179.97438 * 7 5 4 9 9 C 1.53004 * 109.47040 * 60.00357 * 8 7 5 10 10 C 1.52997 * 109.47421 * 300.00627 * 8 7 5 11 11 C 1.50697 * 109.47218 * 180.02562 * 8 7 5 12 12 O 1.21280 * 119.99955 * 145.00225 * 11 8 7 13 13 N 1.34779 * 119.99752 * 325.00214 * 11 8 7 14 14 C 1.46502 * 119.99836 * 179.97438 * 13 11 8 15 15 H 1.09005 * 110.88439 * 37.43323 * 14 13 11 16 16 C 1.54903 * 111.00519 * 273.54755 * 14 13 11 17 17 N 1.47432 * 104.82907 * 204.91512 * 16 14 13 18 18 C 1.36939 * 125.64614 * 204.09177 * 17 16 14 19 19 H 1.07998 * 119.99883 * 164.05117 * 18 17 16 20 20 C 1.38809 * 119.99995 * 344.04804 * 18 17 16 21 21 N 1.31624 * 120.00430 * 156.77579 * 20 18 17 22 22 Si 1.86806 * 120.00117 * 336.77366 * 20 18 17 23 23 H 1.48501 * 109.47085 * 90.00142 * 22 20 18 24 24 H 1.48497 * 109.47205 * 330.00090 * 22 20 18 25 25 H 1.48504 * 109.46923 * 209.99879 * 22 20 18 26 26 C 1.47011 * 108.70381 * 24.35951 * 17 16 14 27 27 C 1.54332 * 107.26886 * 358.58232 * 26 17 16 28 28 H 1.09002 * 110.51890 * 96.45012 * 27 26 17 29 29 C 1.52999 * 110.85499 * 219.67559 * 27 26 17 30 30 H 1.09003 * 109.47350 * 299.99405 * 1 2 3 31 31 H 1.08995 * 109.47268 * 59.99820 * 1 2 3 32 32 H 1.09008 * 109.47057 * 180.02562 * 1 2 3 33 33 H 1.09002 * 109.47000 * 239.99902 * 2 1 3 34 34 H 1.09001 * 109.46879 * 120.00041 * 2 1 3 35 35 H 1.09002 * 109.47286 * 60.00077 * 3 2 1 36 36 H 1.08995 * 109.47219 * 300.00210 * 3 2 1 37 37 H 0.97000 * 120.00426 * 0.02562 * 4 3 2 38 38 H 0.96993 * 120.00010 * 0.02562 * 7 5 4 39 39 H 1.08989 * 109.47394 * 180.02562 * 9 8 7 40 40 H 1.09006 * 109.46900 * 300.00300 * 9 8 7 41 41 H 1.09000 * 109.47093 * 59.99751 * 9 8 7 42 42 H 1.09006 * 109.46704 * 299.99700 * 10 8 7 43 43 H 1.09002 * 109.47522 * 59.99271 * 10 8 7 44 44 H 1.08995 * 109.47284 * 180.02562 * 10 8 7 45 45 H 0.96999 * 120.00491 * 0.02562 * 13 11 8 46 46 H 1.09003 * 110.36676 * 86.08177 * 16 14 13 47 47 H 1.08999 * 110.37032 * 323.75567 * 16 14 13 48 48 H 0.97001 * 119.99004 * 4.52131 * 21 20 18 49 49 H 1.09000 * 109.88765 * 118.12677 * 26 17 16 50 50 H 1.09008 * 109.88544 * 239.29336 * 26 17 16 51 51 H 1.08992 * 109.47457 * 173.69142 * 29 27 26 52 52 H 1.09005 * 109.47103 * 293.69345 * 29 27 26 53 53 H 1.09004 * 109.46692 * 53.68814 * 29 27 26 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 1.4424 0.0000 4 7 3.5050 1.4424 0.0006 5 6 4.1789 2.6096 0.0012 6 8 3.5709 3.6626 0.0018 7 7 5.5267 2.6096 0.0013 8 6 6.2592 3.8784 0.0014 9 6 5.8896 4.6805 1.2508 10 6 5.8896 4.6809 -1.2476 11 6 7.7408 3.6030 0.0008 12 8 8.4940 4.3383 -0.6016 13 7 8.2288 2.5396 0.6698 14 6 9.6691 2.2716 0.6688 15 1 10.2373 3.2008 0.7118 16 6 10.0761 1.4284 -0.5653 17 7 11.3126 0.7363 -0.1582 18 6 12.2788 0.2639 -1.0059 19 1 13.2549 0.0064 -0.6221 20 6 12.0036 0.1160 -2.3584 21 7 12.9866 0.1136 -3.2337 22 14 10.2380 -0.0796 -2.9364 23 1 9.6585 1.2582 -3.2188 24 1 9.4419 -0.7504 -1.8774 25 1 10.2102 -0.9021 -4.1726 26 6 11.3333 0.6315 1.3080 27 6 10.0596 1.3256 1.8350 28 1 9.2731 0.5933 2.0173 29 6 10.3607 2.1260 3.1037 30 1 -0.3634 0.5137 0.8900 31 1 -0.3633 0.5138 -0.8899 32 1 -0.3633 -1.0277 0.0005 33 1 1.8933 -0.5139 -0.8900 34 1 1.8933 -0.5138 0.8900 35 1 1.6767 1.9563 0.8900 36 1 1.6766 1.9563 -0.8899 37 1 3.9901 0.6024 0.0006 38 1 6.0117 1.7696 0.0005 39 1 6.4341 5.6246 1.2507 40 1 4.8178 4.8797 1.2508 41 1 6.1529 4.1088 2.1407 42 1 6.1529 4.1094 -2.1377 43 1 4.8179 4.8800 -1.2477 44 1 6.4349 5.6246 -1.2478 45 1 7.6264 1.9513 1.1513 46 1 10.2680 2.0761 -1.4208 47 1 9.2970 0.7044 -0.8038 48 1 13.9069 0.1491 -2.9293 49 1 11.3360 -0.4173 1.6048 50 1 12.2169 1.1330 1.7031 51 1 9.4771 2.6949 3.3927 52 1 10.6323 1.4428 3.9084 53 1 11.1875 2.8105 2.9137 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 ZINC001211334092.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 06:13:03 Heat of formation + Delta-G solvation = -47.957418 kcal Electronic energy + Delta-G solvation = -31455.018126 eV Core-core repulsion = 27362.269029 eV Total energy + Delta-G solvation = -4092.749097 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.226 amu Computer time = 0.82 seconds Orbital eigenvalues (eV) -40.97353 -39.68205 -38.08753 -36.55247 -35.28974 -34.22487 -33.23987 -32.78354 -31.09652 -31.03222 -28.22929 -27.30535 -26.41861 -26.06168 -24.33329 -22.68482 -22.03774 -21.23632 -20.83442 -20.23341 -19.42942 -18.81453 -17.50799 -17.46739 -16.38726 -16.18605 -16.00392 -15.35796 -15.03371 -14.86260 -14.70620 -14.35395 -14.23261 -13.91671 -13.72956 -13.33464 -13.32432 -13.10122 -12.98589 -12.81956 -12.56780 -12.49207 -12.34867 -12.12347 -12.03658 -11.94820 -11.76580 -11.55870 -11.45904 -11.27381 -11.17604 -11.11966 -10.77199 -10.52636 -10.34155 -10.17379 -9.69833 -9.63754 -9.53747 -9.26119 -9.16631 -8.91529 -8.51007 -7.10111 -6.33459 -3.25418 2.20043 2.71512 2.97052 3.04227 3.41664 3.46921 3.63141 3.88766 4.41092 4.45104 4.54640 4.58030 4.74488 4.79929 4.83754 4.91451 5.01033 5.10981 5.19836 5.20287 5.20595 5.32101 5.48873 5.50866 5.57848 5.59803 5.65246 5.68689 5.69458 5.70505 5.76671 5.80609 5.85089 5.91824 6.01267 6.06251 6.19632 6.19801 6.23348 6.30353 6.35111 6.48714 6.56711 6.58493 6.70210 6.73116 7.45412 7.70746 7.71209 8.16803 8.32726 8.35474 9.01060 9.56050 10.22360 11.13887 Molecular weight = 340.23amu Principal moments of inertia in cm(-1) A = 0.010699 B = 0.003206 C = 0.002933 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2616.498912 B = 8731.302502 C = 9542.935904 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.149 4.149 2 C -0.137 4.137 3 C 0.138 3.862 4 N -0.748 5.748 5 C 0.711 3.289 6 O -0.582 6.582 7 N -0.742 5.742 8 C 0.181 3.819 9 C -0.158 4.158 10 C -0.151 4.151 11 C 0.514 3.486 12 O -0.516 6.516 13 N -0.717 5.717 14 C 0.134 3.866 15 H 0.100 0.900 16 C 0.102 3.898 17 N -0.605 5.605 18 C -0.329 4.329 19 H 0.076 0.924 20 C -0.017 4.017 21 N -0.919 5.919 22 Si 1.063 2.937 23 H -0.292 1.292 24 H -0.289 1.289 25 H -0.298 1.298 26 C 0.140 3.860 27 C -0.110 4.110 28 H 0.077 0.923 29 C -0.138 4.138 30 H 0.057 0.943 31 H 0.058 0.942 32 H 0.059 0.941 33 H 0.069 0.931 34 H 0.069 0.931 35 H 0.066 0.934 36 H 0.066 0.934 37 H 0.397 0.603 38 H 0.396 0.604 39 H 0.071 0.929 40 H 0.092 0.908 41 H 0.058 0.942 42 H 0.058 0.942 43 H 0.086 0.914 44 H 0.075 0.925 45 H 0.395 0.605 46 H 0.064 0.936 47 H 0.030 0.970 48 H 0.264 0.736 49 H 0.031 0.969 50 H 0.033 0.967 51 H 0.052 0.948 52 H 0.056 0.944 53 H 0.059 0.941 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -22.836 1.626 12.478 26.073 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 -0.207 4.207 2 C -0.175 4.175 3 C 0.014 3.986 4 N -0.404 5.404 5 C 0.411 3.589 6 O -0.460 6.460 7 N -0.400 5.400 8 C 0.092 3.908 9 C -0.216 4.216 10 C -0.210 4.210 11 C 0.298 3.702 12 O -0.389 6.389 13 N -0.368 5.368 14 C 0.029 3.971 15 H 0.118 0.882 16 C -0.025 4.025 17 N -0.333 5.333 18 C -0.456 4.456 19 H 0.093 0.907 20 C -0.218 4.218 21 N -0.559 5.559 22 Si 0.895 3.105 23 H -0.220 1.220 24 H -0.216 1.216 25 H -0.226 1.226 26 C 0.014 3.986 27 C -0.129 4.129 28 H 0.095 0.905 29 C -0.196 4.196 30 H 0.077 0.923 31 H 0.077 0.923 32 H 0.078 0.922 33 H 0.088 0.912 34 H 0.087 0.913 35 H 0.084 0.916 36 H 0.084 0.916 37 H 0.231 0.769 38 H 0.231 0.769 39 H 0.090 0.910 40 H 0.111 0.889 41 H 0.077 0.923 42 H 0.077 0.923 43 H 0.105 0.895 44 H 0.094 0.906 45 H 0.229 0.771 46 H 0.082 0.918 47 H 0.048 0.952 48 H 0.074 0.926 49 H 0.049 0.951 50 H 0.051 0.949 51 H 0.071 0.929 52 H 0.075 0.925 53 H 0.078 0.922 Dipole moment (debyes) X Y Z Total from point charges -23.667 2.980 10.628 26.115 hybrid contribution 1.233 -1.206 1.600 2.353 sum -22.434 1.774 12.228 25.612 Atomic orbital electron populations 1.21671 0.94473 1.02207 1.02354 1.21752 0.97002 0.95905 1.02880 1.21249 0.78013 0.96925 1.02420 1.45186 1.07433 1.07217 1.80581 1.15819 0.81298 0.84310 0.77486 1.90872 1.67765 1.29915 1.57456 1.45332 1.05034 1.08884 1.80773 1.20430 0.86881 0.84423 0.99103 1.22191 1.04875 0.99837 0.94696 1.22086 1.03748 1.00274 0.94870 1.20461 0.89767 0.81124 0.78830 1.90776 1.58878 1.47213 1.42029 1.46053 1.09068 1.28595 1.53124 1.22381 0.79278 0.99109 0.96381 0.88183 1.22300 0.89902 0.94062 0.96224 1.44657 1.21650 1.66215 1.00733 1.20011 0.91532 1.43722 0.90364 0.90658 1.25908 1.06009 0.98355 0.91490 1.70903 1.00169 1.50218 1.34642 0.83845 0.75532 0.76474 0.74635 1.21977 1.21581 1.22605 1.21410 0.94051 0.97283 0.85888 1.22444 0.99295 0.96975 0.94217 0.90478 1.21740 1.01499 0.99773 0.96549 0.92347 0.92294 0.92154 0.91193 0.91269 0.91589 0.91563 0.76946 0.76895 0.91012 0.88921 0.92320 0.92253 0.89506 0.90573 0.77070 0.91761 0.95226 0.92614 0.95149 0.94869 0.92903 0.92483 0.92239 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 16. 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 -0.67 9.91 37.16 0.37 -0.30 16 2 C -0.14 -0.67 6.05 -26.73 -0.16 -0.83 16 3 C 0.14 0.98 5.67 -4.04 -0.02 0.96 16 4 N -0.75 -5.86 5.56 -65.23 -0.36 -6.23 16 5 C 0.71 7.72 7.98 -86.92 -0.69 7.03 16 6 O -0.58 -8.07 12.55 5.28 0.07 -8.00 16 7 N -0.74 -7.52 4.86 -53.50 -0.26 -7.78 16 8 C 0.18 2.21 0.98 -132.97 -0.13 2.08 16 9 C -0.16 -1.72 8.38 37.16 0.31 -1.41 16 10 C -0.15 -2.01 7.93 37.16 0.29 -1.72 16 11 C 0.51 7.62 6.65 -10.99 -0.07 7.55 16 12 O -0.52 -9.87 15.84 5.56 0.09 -9.78 16 13 N -0.72 -9.50 4.93 -51.73 -0.25 -9.76 16 14 C 0.13 2.24 2.77 -65.78 -0.18 2.06 16 15 H 0.10 1.86 7.64 -51.93 -0.40 1.46 16 16 C 0.10 2.22 4.40 -2.53 -0.01 2.21 16 17 N -0.60 -14.70 3.23 -170.07 -0.55 -15.25 16 18 C -0.33 -9.45 10.44 -15.06 -0.16 -9.60 16 19 H 0.08 2.27 8.06 -52.49 -0.42 1.85 16 20 C -0.02 -0.49 5.43 -17.43 -0.09 -0.59 16 21 N -0.92 -29.09 13.70 55.49 0.76 -28.33 16 22 Si 1.06 27.06 24.70 -169.99 -4.20 22.86 16 23 H -0.29 -7.33 6.70 56.52 0.38 -6.95 16 24 H -0.29 -6.77 6.25 56.52 0.35 -6.41 16 25 H -0.30 -7.65 7.11 56.52 0.40 -7.25 16 26 C 0.14 2.68 6.85 -3.07 -0.02 2.66 16 27 C -0.11 -1.60 3.16 -88.78 -0.28 -1.88 16 28 H 0.08 0.97 8.00 -51.93 -0.42 0.56 16 29 C -0.14 -1.63 9.16 37.16 0.34 -1.29 16 30 H 0.06 0.25 8.14 -51.93 -0.42 -0.17 16 31 H 0.06 0.27 8.14 -51.93 -0.42 -0.15 16 32 H 0.06 0.24 8.14 -51.92 -0.42 -0.18 16 33 H 0.07 0.34 8.14 -51.93 -0.42 -0.08 16 34 H 0.07 0.31 8.14 -51.93 -0.42 -0.12 16 35 H 0.07 0.51 8.14 -51.93 -0.42 0.09 16 36 H 0.07 0.54 8.14 -51.93 -0.42 0.12 16 37 H 0.40 2.21 8.49 -40.82 -0.35 1.86 16 38 H 0.40 3.36 7.25 -40.82 -0.30 3.06 16 39 H 0.07 0.77 8.14 -51.94 -0.42 0.35 16 40 H 0.09 1.10 6.16 -51.93 -0.32 0.78 16 41 H 0.06 0.57 8.14 -51.93 -0.42 0.14 16 42 H 0.06 0.84 8.14 -51.93 -0.42 0.41 16 43 H 0.09 1.17 6.16 -51.93 -0.32 0.85 16 44 H 0.08 1.02 7.87 -51.93 -0.41 0.61 16 45 H 0.39 3.90 7.26 -40.82 -0.30 3.61 16 46 H 0.06 1.62 6.52 -51.93 -0.34 1.28 16 47 H 0.03 0.65 5.45 -51.93 -0.28 0.36 16 48 H 0.26 8.23 8.73 -40.82 -0.36 7.87 16 49 H 0.03 0.58 8.14 -51.93 -0.42 0.16 16 50 H 0.03 0.64 7.77 -51.92 -0.40 0.24 16 51 H 0.05 0.55 8.14 -51.93 -0.42 0.13 16 52 H 0.06 0.59 8.14 -51.93 -0.42 0.17 16 53 H 0.06 0.75 8.07 -51.93 -0.42 0.33 16 LS Contribution 410.46 15.07 6.19 6.19 Total: -1.00 -35.75 410.46 -8.42 -44.17 By element: Atomic # 1 Polarization: 14.36 SS G_CDS: -9.39 Total: 4.97 kcal Atomic # 6 Polarization: 7.44 SS G_CDS: -0.51 Total: 6.93 kcal Atomic # 7 Polarization: -66.67 SS G_CDS: -0.67 Total: -67.34 kcal Atomic # 8 Polarization: -17.94 SS G_CDS: 0.15 Total: -17.78 kcal Atomic # 14 Polarization: 27.06 SS G_CDS: -4.20 Total: 22.86 kcal Total LS contribution 6.19 Total: 6.19 kcal Total: -35.75 -8.42 -44.17 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. ZINC001211334092.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 -3.784 kcal (2) G-P(sol) polarization free energy of solvation -35.749 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -39.533 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -8.424 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -44.174 kcal (6) G-S(sol) free energy of system = (1) + (5) -47.957 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.82 seconds