Wall clock time and date at job start Sat Apr 11 2020 06:12:46 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 1.52998 * 1 3 3 C 1.53003 * 109.47226 * 2 1 4 4 C 1.52998 * 109.47226 * 180.02562 * 3 2 1 5 5 C 1.53003 * 109.47226 * 180.02562 * 4 3 2 6 6 H 1.09000 * 109.46660 * 54.99480 * 5 4 3 7 7 N 1.46501 * 109.47082 * 295.00336 * 5 4 3 8 8 C 1.34779 * 119.99567 * 299.99438 * 7 5 4 9 9 N 1.34772 * 120.00146 * 179.97438 * 8 7 5 10 10 O 1.21587 * 120.00359 * 0.02562 * 8 7 5 11 11 C 1.50698 * 109.47127 * 174.99775 * 5 4 3 12 12 O 1.21287 * 119.99808 * 100.00023 * 11 5 4 13 13 N 1.34777 * 120.00011 * 279.99907 * 11 5 4 14 14 C 1.46500 * 119.99614 * 180.02562 * 13 11 5 15 15 C 1.53000 * 109.46703 * 179.97438 * 14 13 11 16 16 H 1.09004 * 110.64350 * 54.30328 * 15 14 13 17 17 C 1.54322 * 110.72224 * 291.15665 * 15 14 13 18 18 N 1.47027 * 107.27100 * 219.44753 * 17 15 14 19 19 C 1.36934 * 125.64595 * 178.97916 * 18 17 15 20 20 H 1.07994 * 120.00254 * 349.93414 * 19 18 17 21 21 C 1.38816 * 119.99800 * 169.93605 * 19 18 17 22 22 N 1.31621 * 120.00207 * 350.42298 * 21 19 18 23 23 Si 1.86802 * 119.99948 * 170.41913 * 21 19 18 24 24 H 1.48494 * 109.46888 * 94.14457 * 23 21 19 25 25 H 1.48499 * 109.47198 * 214.14344 * 23 21 19 26 26 H 1.48501 * 109.46971 * 334.14154 * 23 21 19 27 27 C 1.47429 * 108.70414 * 358.93503 * 18 17 15 28 28 C 1.55124 * 104.93967 * 24.01054 * 27 18 17 29 29 H 1.08993 * 110.93937 * 81.21004 * 28 27 18 30 30 C 1.53005 * 111.16204 * 205.12867 * 28 27 18 31 31 H 1.09004 * 109.46700 * 179.97438 * 1 2 3 32 32 H 1.08997 * 109.47166 * 300.00182 * 1 2 3 33 33 H 1.08999 * 109.46795 * 60.00445 * 1 2 3 34 34 H 1.09009 * 109.47582 * 239.99890 * 2 1 3 35 35 H 1.08998 * 109.47450 * 119.99921 * 2 1 3 36 36 H 1.08997 * 109.47197 * 59.99837 * 3 2 1 37 37 H 1.09005 * 109.46700 * 299.99925 * 3 2 1 38 38 H 1.08997 * 109.47166 * 59.99818 * 4 3 2 39 39 H 1.09005 * 109.47220 * 299.99607 * 4 3 2 40 40 H 0.96989 * 120.00555 * 119.99791 * 7 5 4 41 41 H 0.97003 * 120.00135 * 0.02562 * 9 8 7 42 42 H 0.96996 * 120.00782 * 180.02562 * 9 8 7 43 43 H 0.96997 * 119.99686 * 0.02562 * 13 11 5 44 44 H 1.09000 * 109.47056 * 300.00015 * 14 13 11 45 45 H 1.09002 * 109.47068 * 60.00142 * 14 13 11 46 46 H 1.09000 * 109.88287 * 338.85826 * 17 15 14 47 47 H 1.08994 * 109.88371 * 100.03006 * 17 15 14 48 48 H 0.96996 * 120.00070 * 179.97438 * 22 21 19 49 49 H 1.08996 * 110.36485 * 142.96403 * 27 18 17 50 50 H 1.08994 * 110.37021 * 265.29500 * 27 18 17 51 51 H 1.09004 * 109.47105 * 172.16543 * 30 28 27 52 52 H 1.09000 * 109.46712 * 292.16718 * 30 28 27 53 53 H 1.08999 * 109.46689 * 52.16737 * 30 28 27 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 1.4425 0.0000 4 6 3.5700 1.4425 -0.0006 5 6 4.0800 2.8850 0.0000 6 1 3.6457 3.4235 0.8423 7 7 3.6919 3.5408 -1.2512 8 6 4.1160 3.0460 -2.4310 9 7 3.7585 3.6489 -3.5822 10 8 4.8203 2.0553 -2.4569 11 6 5.5820 2.8867 0.1233 12 8 6.2712 3.0403 -0.8629 13 7 6.1593 2.7176 1.3293 14 6 7.6194 2.7199 1.4491 15 6 8.0112 2.5111 2.9133 16 1 7.5454 1.6093 3.3109 17 6 7.6295 3.7424 3.7616 18 7 8.7196 3.9652 4.7227 19 6 8.7757 4.9752 5.6457 20 1 8.0612 5.7839 5.6053 21 6 9.7511 4.9595 6.6333 22 7 10.4998 3.8901 6.8019 23 14 10.0013 6.4561 7.7228 24 1 9.2122 6.2972 8.9707 25 1 11.4413 6.5870 8.0611 26 1 9.5493 7.6736 7.0028 27 6 9.7417 2.9206 4.5289 28 6 9.5540 2.4443 3.0645 29 1 10.0446 3.1240 2.3679 30 6 10.0617 1.0128 2.8799 31 1 -0.3633 -1.0277 -0.0005 32 1 -0.3633 0.5138 0.8899 33 1 -0.3633 0.5138 -0.8900 34 1 1.8934 -0.5139 -0.8900 35 1 1.8934 -0.5138 0.8900 36 1 1.6767 1.9564 0.8899 37 1 1.6766 1.9563 -0.8901 38 1 3.9330 0.9288 -0.8908 39 1 3.9337 0.9286 0.8892 40 1 3.1298 4.3309 -1.2307 41 1 3.1963 4.4391 -3.5616 42 1 4.0634 3.2927 -4.4313 43 1 5.6081 2.5945 2.1178 44 1 8.0349 1.9148 0.8430 45 1 8.0111 3.6758 1.1013 46 1 7.5181 4.6154 3.1186 47 1 6.6985 3.5509 4.2950 48 1 11.1816 3.8793 7.4918 49 1 10.7397 3.3359 4.6686 50 1 9.5742 2.0932 5.2183 51 1 9.7923 0.6571 1.8854 52 1 11.1459 0.9947 2.9910 53 1 9.6086 0.3668 3.6319 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 ZINC001102613079.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 06:12:46 Heat of formation + Delta-G solvation = -64.730598 kcal Electronic energy + Delta-G solvation = -30717.653299 eV Core-core repulsion = 26624.176862 eV Total energy + Delta-G solvation = -4093.476437 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.226 amu Computer time = 0.93 seconds Orbital eigenvalues (eV) -40.65531 -38.98579 -37.86658 -36.39831 -34.56925 -34.30892 -33.62272 -32.89977 -30.79334 -30.70549 -29.33060 -27.05441 -25.85817 -24.94522 -23.19124 -22.69451 -21.78755 -21.03402 -20.13393 -19.82416 -19.19493 -18.70035 -17.63149 -16.88694 -16.57689 -16.03454 -15.71489 -15.33899 -15.04150 -14.64880 -14.45500 -14.31678 -14.23627 -14.07452 -13.77077 -13.40317 -13.33303 -12.97919 -12.88066 -12.61705 -12.59802 -12.03465 -11.81328 -11.55438 -11.51501 -11.48522 -11.35090 -11.13366 -11.12115 -10.84876 -10.81188 -10.77865 -10.30414 -10.12651 -10.01304 -9.89848 -9.86620 -9.76193 -9.66342 -9.54115 -8.92882 -8.78158 -8.57203 -6.78855 -5.74241 -3.06584 2.57856 2.88390 3.19426 3.39128 3.45066 3.47178 3.48063 4.31137 4.48161 4.49850 4.65818 4.70304 4.81896 4.93121 5.05663 5.15832 5.18161 5.29436 5.33220 5.45319 5.47568 5.48998 5.59067 5.62018 5.63918 5.80222 5.80452 5.90835 5.92724 6.01144 6.10434 6.13716 6.18673 6.22814 6.29295 6.30774 6.50727 6.53661 6.57303 6.61986 6.66615 6.81188 6.82151 6.97932 7.53393 7.61224 7.67735 7.79779 7.84761 8.27074 8.41491 8.67039 9.20186 9.82260 10.50337 11.38786 Molecular weight = 340.23amu Principal moments of inertia in cm(-1) A = 0.013649 B = 0.002312 C = 0.002250 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2050.949663 B =12108.876804 C =12441.671003 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.152 4.152 2 C -0.125 4.125 3 C -0.112 4.112 4 C -0.135 4.135 5 C 0.154 3.846 6 H 0.108 0.892 7 N -0.732 5.732 8 C 0.711 3.289 9 N -0.872 5.872 10 O -0.563 6.563 11 C 0.496 3.504 12 O -0.510 6.510 13 N -0.727 5.727 14 C 0.136 3.864 15 C -0.108 4.108 16 H 0.077 0.923 17 C 0.142 3.858 18 N -0.604 5.604 19 C -0.229 4.229 20 H 0.075 0.925 21 C -0.007 4.007 22 N -0.917 5.917 23 Si 0.910 3.090 24 H -0.289 1.289 25 H -0.290 1.290 26 H -0.281 1.281 27 C 0.181 3.819 28 C -0.113 4.113 29 H 0.070 0.930 30 C -0.134 4.134 31 H 0.052 0.948 32 H 0.053 0.947 33 H 0.051 0.949 34 H 0.061 0.939 35 H 0.063 0.937 36 H 0.061 0.939 37 H 0.061 0.939 38 H 0.095 0.905 39 H 0.075 0.925 40 H 0.398 0.602 41 H 0.392 0.608 42 H 0.412 0.588 43 H 0.398 0.602 44 H 0.064 0.936 45 H 0.065 0.935 46 H 0.023 0.977 47 H 0.018 0.982 48 H 0.253 0.747 49 H 0.068 0.932 50 H 0.027 0.973 51 H 0.046 0.954 52 H 0.053 0.947 53 H 0.053 0.947 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -19.219 -4.356 -16.584 25.756 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 -0.209 4.209 2 C -0.163 4.163 3 C -0.150 4.150 4 C -0.174 4.174 5 C 0.044 3.956 6 H 0.126 0.874 7 N -0.389 5.389 8 C 0.409 3.591 9 N -0.441 5.441 10 O -0.438 6.438 11 C 0.279 3.721 12 O -0.384 6.384 13 N -0.380 5.380 14 C 0.012 3.988 15 C -0.127 4.127 16 H 0.095 0.905 17 C 0.016 3.984 18 N -0.330 5.330 19 C -0.357 4.357 20 H 0.093 0.907 21 C -0.204 4.204 22 N -0.564 5.564 23 Si 0.740 3.260 24 H -0.216 1.216 25 H -0.216 1.216 26 H -0.206 1.206 27 C 0.056 3.944 28 C -0.133 4.133 29 H 0.089 0.911 30 C -0.192 4.192 31 H 0.071 0.929 32 H 0.073 0.927 33 H 0.070 0.930 34 H 0.080 0.920 35 H 0.081 0.919 36 H 0.080 0.920 37 H 0.080 0.920 38 H 0.114 0.886 39 H 0.094 0.906 40 H 0.232 0.768 41 H 0.219 0.781 42 H 0.244 0.756 43 H 0.232 0.768 44 H 0.082 0.918 45 H 0.084 0.916 46 H 0.041 0.959 47 H 0.036 0.964 48 H 0.063 0.937 49 H 0.086 0.914 50 H 0.045 0.955 51 H 0.065 0.935 52 H 0.072 0.928 53 H 0.072 0.928 Dipole moment (debyes) X Y Z Total from point charges -17.956 -5.047 -16.979 25.222 hybrid contribution -0.518 1.429 0.791 1.714 sum -18.474 -3.618 -16.188 24.828 Atomic orbital electron populations 1.21767 0.95975 1.01525 1.01631 1.21519 0.95663 0.96888 1.02234 1.21548 0.94555 0.96978 1.01879 1.22016 0.95971 0.94473 1.04930 1.20714 0.92325 0.95994 0.86545 0.87373 1.44671 1.56645 1.33369 1.04223 1.15829 0.79553 0.83199 0.80503 1.42974 1.58884 1.34450 1.07781 1.90967 1.40005 1.26976 1.85812 1.20821 0.90529 0.77364 0.83393 1.90756 1.64345 1.46874 1.36386 1.46044 1.08304 1.74498 1.09169 1.21380 0.78998 1.01827 0.96547 1.22470 0.97789 0.99400 0.93074 0.90466 1.21330 0.91972 0.93806 0.91287 1.44463 1.18131 1.31584 1.38800 1.18999 1.13347 0.98708 1.04669 0.90745 1.24820 0.99723 0.97582 0.98283 1.69956 1.24692 1.26753 1.35048 0.86145 0.77210 0.82244 0.80404 1.21640 1.21612 1.20645 1.21479 0.94372 0.90646 0.87916 1.22620 0.92961 0.96398 1.01339 0.91142 1.21649 1.00943 0.96163 1.00461 0.92872 0.92740 0.92970 0.92047 0.91868 0.91995 0.92050 0.88650 0.90639 0.76844 0.78088 0.75583 0.76774 0.91810 0.91624 0.95899 0.96373 0.93715 0.91415 0.95459 0.93538 0.92765 0.92814 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 15. 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 -0.95 9.91 37.16 0.37 -0.59 16 2 C -0.13 -0.92 5.93 -26.73 -0.16 -1.08 16 3 C -0.11 -0.80 5.10 -26.73 -0.14 -0.94 16 4 C -0.14 -1.27 4.54 -26.73 -0.12 -1.39 16 5 C 0.15 1.49 3.01 -69.08 -0.21 1.28 16 6 H 0.11 0.71 8.14 -51.93 -0.42 0.29 16 7 N -0.73 -6.48 4.66 -59.81 -0.28 -6.75 16 8 C 0.71 8.31 7.59 -86.92 -0.66 7.65 16 9 N -0.87 -6.41 8.88 27.63 0.25 -6.16 16 10 O -0.56 -9.38 13.03 -18.20 -0.24 -9.62 16 11 C 0.50 6.95 6.82 -10.99 -0.07 6.88 16 12 O -0.51 -9.51 13.68 -17.94 -0.25 -9.75 16 13 N -0.73 -9.46 5.43 -60.29 -0.33 -9.79 16 14 C 0.14 2.09 5.00 -4.04 -0.02 2.07 16 15 C -0.11 -1.81 2.45 -88.78 -0.22 -2.02 16 16 H 0.08 1.23 8.04 -51.93 -0.42 0.81 16 17 C 0.14 2.86 6.64 -3.06 -0.02 2.84 16 18 N -0.60 -15.34 3.40 -169.94 -0.58 -15.92 16 19 C -0.23 -6.38 10.24 -15.06 -0.15 -6.53 16 20 H 0.07 2.01 7.85 -52.49 -0.41 1.60 16 21 C -0.01 -0.21 5.40 -17.43 -0.09 -0.30 16 22 N -0.92 -26.91 10.68 55.49 0.59 -26.32 16 23 Si 0.91 22.04 29.56 -169.99 -5.03 17.01 16 24 H -0.29 -6.97 7.11 56.52 0.40 -6.57 16 25 H -0.29 -7.08 7.11 56.52 0.40 -6.68 16 26 H -0.28 -6.65 7.11 56.52 0.40 -6.25 16 27 C 0.18 4.33 4.91 -2.41 -0.01 4.32 16 28 C -0.11 -2.09 3.10 -88.35 -0.27 -2.37 16 29 H 0.07 1.33 8.05 -51.93 -0.42 0.91 16 30 C -0.13 -2.11 9.32 37.16 0.35 -1.77 16 31 H 0.05 0.32 8.14 -51.93 -0.42 -0.11 16 32 H 0.05 0.32 8.14 -51.93 -0.42 -0.10 16 33 H 0.05 0.32 8.14 -51.93 -0.42 -0.11 16 34 H 0.06 0.50 8.14 -51.92 -0.42 0.08 16 35 H 0.06 0.46 8.14 -51.93 -0.42 0.03 16 36 H 0.06 0.37 8.14 -51.93 -0.42 -0.05 16 37 H 0.06 0.45 7.75 -51.93 -0.40 0.05 16 38 H 0.10 1.22 6.04 -51.93 -0.31 0.90 16 39 H 0.08 0.66 8.14 -51.93 -0.42 0.24 16 40 H 0.40 2.12 8.84 -40.82 -0.36 1.76 16 41 H 0.39 1.52 8.84 -40.82 -0.36 1.16 16 42 H 0.41 2.81 8.93 -40.82 -0.36 2.45 16 43 H 0.40 4.24 8.40 -40.82 -0.34 3.90 16 44 H 0.06 1.01 8.14 -51.93 -0.42 0.59 16 45 H 0.07 1.12 8.00 -51.93 -0.42 0.70 16 46 H 0.02 0.47 7.73 -51.93 -0.40 0.07 16 47 H 0.02 0.36 8.14 -51.93 -0.42 -0.06 16 48 H 0.25 7.19 8.31 -40.82 -0.34 6.85 16 49 H 0.07 1.82 6.94 -51.93 -0.36 1.46 16 50 H 0.03 0.71 7.92 -51.93 -0.41 0.30 16 51 H 0.05 0.65 8.14 -51.93 -0.42 0.23 16 52 H 0.05 0.83 8.14 -51.93 -0.42 0.40 16 53 H 0.05 0.84 8.08 -51.93 -0.42 0.42 16 LS Contribution 418.01 15.07 6.30 6.30 Total: -1.00 -37.09 418.01 -10.60 -47.69 By element: Atomic # 1 Polarization: 14.88 SS G_CDS: -9.61 Total: 5.27 kcal Atomic # 6 Polarization: 9.49 SS G_CDS: -1.44 Total: 8.05 kcal Atomic # 7 Polarization: -64.61 SS G_CDS: -0.34 Total: -64.95 kcal Atomic # 8 Polarization: -18.89 SS G_CDS: -0.48 Total: -19.37 kcal Atomic # 14 Polarization: 22.04 SS G_CDS: -5.03 Total: 17.01 kcal Total LS contribution 6.30 Total: 6.30 kcal Total: -37.09 -10.60 -47.69 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. ZINC001102613079.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 -17.040 kcal (2) G-P(sol) polarization free energy of solvation -37.093 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -54.132 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.598 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -47.691 kcal (6) G-S(sol) free energy of system = (1) + (5) -64.731 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.93 seconds