Wall clock time and date at job start Tue Mar 31 2020 13:44:10 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 1.53005 * 1 3 3 H 1.08992 * 109.46960 * 2 1 4 4 C 1.52997 * 109.47168 * 120.00287 * 2 1 3 5 5 N 1.46895 * 109.47152 * 175.07038 * 4 2 1 6 6 C 1.46847 * 111.00188 * 199.48318 * 5 4 2 7 7 C 1.53037 * 109.52851 * 174.15847 * 6 5 4 8 8 C 1.53121 * 109.27335 * 59.17622 * 7 6 5 9 9 C 1.53119 * 109.16242 * 302.34690 * 8 7 6 10 10 H 1.09004 * 109.53790 * 297.69341 * 9 8 7 11 11 C 1.53004 * 109.50362 * 177.59783 * 9 8 7 12 12 C 1.46842 * 111.00307 * 75.26823 * 5 4 2 13 13 N 1.46501 * 109.46884 * 240.00227 * 2 1 3 14 14 C 1.34780 * 120.00286 * 87.82155 * 13 2 1 15 15 O 1.21593 * 119.99697 * 359.97438 * 14 13 2 16 16 N 1.34767 * 120.00144 * 180.02562 * 14 13 2 17 17 C 1.46501 * 119.99867 * 180.02562 * 16 14 13 18 18 C 1.53002 * 109.46992 * 184.74719 * 17 16 14 19 19 C 1.50704 * 115.54821 * 294.74434 * 18 17 16 20 20 H 1.08001 * 119.99788 * 99.32654 * 19 18 17 21 21 C 1.37881 * 120.00208 * 279.32159 * 19 18 17 22 22 N 1.31517 * 119.99714 * 5.23403 * 21 19 18 23 23 Si 1.86794 * 120.00100 * 185.23333 * 21 19 18 24 24 H 1.48502 * 109.46854 * 180.02562 * 23 21 19 25 25 H 1.48503 * 109.47386 * 300.00089 * 23 21 19 26 26 H 1.48498 * 109.47321 * 60.00296 * 23 21 19 27 27 C 1.52998 * 117.52247 * 80.44822 * 18 17 16 28 28 C 1.52997 * 117.50044 * 149.08027 * 18 17 16 29 29 H 1.09006 * 109.47217 * 59.99673 * 1 2 3 30 30 H 1.09000 * 109.47169 * 179.97438 * 1 2 3 31 31 H 1.08999 * 109.47020 * 300.00068 * 1 2 3 32 32 H 1.09003 * 109.47112 * 295.06952 * 4 2 1 33 33 H 1.08998 * 109.47239 * 55.07073 * 4 2 1 34 34 H 1.08998 * 109.46054 * 294.17772 * 6 5 4 35 35 H 1.09003 * 109.46275 * 54.14333 * 6 5 4 36 36 H 1.09001 * 109.49981 * 299.24499 * 7 6 5 37 37 H 1.08994 * 109.53737 * 179.13504 * 7 6 5 38 38 H 1.09001 * 109.52072 * 182.44204 * 8 7 6 39 39 H 1.08998 * 109.57879 * 62.28920 * 8 7 6 40 40 H 1.09001 * 109.47339 * 300.19669 * 11 9 8 41 41 H 1.09005 * 109.46971 * 60.19447 * 11 9 8 42 42 H 1.08996 * 109.47528 * 180.19703 * 11 9 8 43 43 H 1.08999 * 109.46333 * 305.86075 * 12 5 4 44 44 H 1.09004 * 109.46004 * 65.83553 * 12 5 4 45 45 H 0.97001 * 120.00075 * 267.82361 * 13 2 1 46 46 H 0.96997 * 120.00063 * 359.97438 * 16 14 13 47 47 H 1.08995 * 109.47132 * 64.74779 * 17 16 14 48 48 H 1.08996 * 109.47343 * 304.74286 * 17 16 14 49 49 H 0.96996 * 119.99736 * 174.99435 * 22 21 19 50 50 H 1.09002 * 117.49998 * 214.97255 * 27 18 17 51 51 H 1.09004 * 117.49072 * 359.97438 * 27 18 17 52 52 H 1.09005 * 117.49716 * 359.96973 * 28 18 17 53 53 H 1.08998 * 117.50915 * 144.99652 * 28 18 17 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 1.5301 0.0000 0.0000 3 1 1.8933 1.0276 0.0000 4 6 2.0401 -0.7213 1.2492 5 7 3.5042 -0.8252 1.1911 6 6 3.9932 -1.8774 2.0912 7 6 5.5007 -2.0561 1.8978 8 6 6.2092 -0.7322 2.1975 9 6 5.6475 0.3574 1.2799 10 1 5.8521 0.0999 0.2407 11 6 6.3076 1.6967 1.6138 12 6 4.1358 0.4660 1.4912 13 7 2.0183 -0.6906 -1.1962 14 6 2.2011 -0.0055 -2.3425 15 8 1.9603 1.1856 -2.3838 16 7 2.6498 -0.6409 -3.4430 17 6 2.8490 0.1038 -4.6887 18 6 3.2457 -0.8652 -5.8044 19 6 4.5751 -1.5523 -5.6263 20 1 4.6144 -2.5612 -5.2429 21 6 5.7412 -0.8929 -5.9529 22 7 5.7019 0.3689 -6.3217 23 14 7.3766 -1.7918 -5.8716 24 1 8.4695 -0.8676 -6.2676 25 1 7.6107 -2.2691 -4.4850 26 1 7.3499 -2.9528 -6.7969 27 6 2.1268 -1.6569 -6.4841 28 6 2.8175 -0.5139 -7.2306 29 1 -0.3634 0.5139 -0.8900 30 1 -0.3633 -1.0277 -0.0005 31 1 -0.3633 0.5138 0.8900 32 1 1.7506 -0.1590 2.1370 33 1 1.6064 -1.7203 1.2944 34 1 3.7905 -1.5948 3.1242 35 1 3.4844 -2.8145 1.8647 36 1 5.7030 -2.3521 0.8684 37 1 5.8665 -2.8264 2.5767 38 1 7.2788 -0.8429 2.0191 39 1 6.0403 -0.4549 3.2380 40 1 6.1038 1.9530 2.6535 41 1 7.3843 1.6187 1.4631 42 1 5.9049 2.4726 0.9628 43 1 3.7305 1.2312 0.8290 44 1 3.9326 0.7376 2.5271 45 1 2.2101 -1.6409 -1.1633 46 1 2.8416 -1.5912 -3.4101 47 1 3.6401 0.8405 -4.5491 48 1 1.9236 0.6115 -4.9605 49 1 6.5269 0.8534 -6.4812 50 1 2.3521 -2.6747 -6.8025 51 1 1.1077 -1.4878 -6.1362 52 1 2.2528 0.4074 -7.3741 53 1 3.4972 -0.7797 -8.0402 RHF calculation, no. of doubly occupied orbitals= 63 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 ZINC000430422607.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 13:44:10 Heat of formation + Delta-G solvation = -23.696813 kcal Electronic energy + Delta-G solvation = -29015.670277 eV Core-core repulsion = 25308.081302 eV Total energy + Delta-G solvation = -3707.588975 eV No. of doubly occupied orbitals = 63 Molecular weight (most abundant/longest-lived isotopes) = 323.231 amu Computer time = 0.77 seconds Orbital eigenvalues (eV) -39.73547 -38.92066 -36.82674 -35.77341 -33.56784 -33.07767 -31.96228 -31.90188 -30.27023 -26.82290 -26.43741 -26.02785 -24.97415 -23.34268 -21.73969 -21.22785 -20.83604 -20.01213 -19.68296 -19.27759 -17.58338 -16.32297 -16.01084 -15.83832 -15.04875 -14.78181 -14.64123 -14.54813 -14.42776 -14.14017 -13.94292 -13.69731 -13.45786 -13.12111 -12.87081 -12.62398 -12.51204 -12.47904 -12.27515 -11.97872 -11.77373 -11.66896 -11.54826 -11.47192 -11.11437 -10.95383 -10.89242 -10.84355 -10.68007 -10.50066 -10.42141 -10.22097 -10.19409 -9.60912 -9.37738 -8.89808 -8.61238 -8.46141 -8.36600 -8.16944 -7.80175 -6.02028 -4.10242 3.30468 3.36175 3.37353 3.39934 3.74995 4.02027 4.39919 4.62935 4.64011 4.76114 4.89769 4.96165 5.06347 5.17947 5.24731 5.27455 5.32971 5.37438 5.42299 5.45096 5.45172 5.50067 5.56046 5.64424 5.69825 5.74100 5.76594 5.79163 5.90381 6.08273 6.10233 6.10976 6.13272 6.21744 6.27778 6.40639 6.40864 6.55429 6.69710 6.75575 6.94548 6.97843 7.03120 7.12895 7.14243 7.43981 7.55110 7.57215 7.80222 7.87398 8.40689 8.86350 8.92119 9.42585 9.56124 11.06011 Molecular weight = 323.23amu Principal moments of inertia in cm(-1) A = 0.010089 B = 0.004130 C = 0.003298 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2774.631175 B = 6777.271577 C = 8486.808525 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.162 4.162 2 C 0.168 3.832 3 H 0.085 0.915 4 C 0.047 3.953 5 N -0.531 5.531 6 C 0.058 3.942 7 C -0.118 4.118 8 C -0.114 4.114 9 C -0.091 4.091 10 H 0.083 0.917 11 C -0.146 4.146 12 C 0.064 3.936 13 N -0.732 5.732 14 C 0.701 3.299 15 O -0.611 6.611 16 N -0.721 5.721 17 C 0.184 3.816 18 C 0.032 3.968 19 C -0.498 4.498 20 H 0.058 0.942 21 C 0.075 3.925 22 N -0.875 5.875 23 Si 0.889 3.111 24 H -0.288 1.288 25 H -0.277 1.277 26 H -0.277 1.277 27 C -0.210 4.210 28 C -0.154 4.154 29 H 0.064 0.936 30 H 0.054 0.946 31 H 0.058 0.942 32 H 0.046 0.954 33 H 0.076 0.924 34 H 0.028 0.972 35 H 0.073 0.927 36 H 0.074 0.926 37 H 0.063 0.937 38 H 0.062 0.938 39 H 0.055 0.945 40 H 0.049 0.951 41 H 0.056 0.944 42 H 0.058 0.942 43 H 0.077 0.923 44 H 0.028 0.972 45 H 0.393 0.607 46 H 0.395 0.605 47 H 0.069 0.931 48 H 0.033 0.967 49 H 0.262 0.738 50 H 0.076 0.924 51 H 0.065 0.935 52 H 0.065 0.935 53 H 0.081 0.919 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -4.369 -3.602 18.592 19.435 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 -0.222 4.222 2 C 0.062 3.938 3 H 0.103 0.897 4 C -0.081 4.081 5 N -0.255 5.255 6 C -0.069 4.069 7 C -0.156 4.156 8 C -0.152 4.152 9 C -0.110 4.110 10 H 0.101 0.899 11 C -0.204 4.204 12 C -0.064 4.064 13 N -0.387 5.387 14 C 0.401 3.599 15 O -0.492 6.492 16 N -0.373 5.373 17 C 0.060 3.940 18 C 0.031 3.969 19 C -0.536 4.536 20 H 0.077 0.923 21 C -0.129 4.129 22 N -0.511 5.511 23 Si 0.717 3.283 24 H -0.213 1.213 25 H -0.203 1.203 26 H -0.203 1.203 27 C -0.247 4.247 28 C -0.192 4.192 29 H 0.083 0.917 30 H 0.073 0.927 31 H 0.077 0.923 32 H 0.064 0.936 33 H 0.095 0.905 34 H 0.046 0.954 35 H 0.091 0.909 36 H 0.093 0.907 37 H 0.082 0.918 38 H 0.081 0.919 39 H 0.073 0.927 40 H 0.069 0.931 41 H 0.075 0.925 42 H 0.077 0.923 43 H 0.096 0.904 44 H 0.046 0.954 45 H 0.227 0.773 46 H 0.228 0.772 47 H 0.088 0.912 48 H 0.051 0.949 49 H 0.072 0.928 50 H 0.095 0.905 51 H 0.083 0.917 52 H 0.083 0.917 53 H 0.100 0.900 Dipole moment (debyes) X Y Z Total from point charges -4.325 -2.470 17.922 18.601 hybrid contribution 0.949 -1.043 0.848 1.646 sum -3.375 -3.512 18.770 19.392 Atomic orbital electron populations 1.22193 0.95830 1.01810 1.02334 1.20612 0.92674 0.97330 0.83233 0.89743 1.22447 0.87946 1.00994 0.96746 1.61781 1.04839 1.06111 1.52723 1.22081 0.96130 0.95007 0.93732 1.21584 0.94147 0.97161 1.02699 1.21627 0.99714 0.94933 0.98897 1.21162 0.93896 0.94914 1.01018 0.89888 1.21784 1.00601 0.96920 1.01057 1.22152 0.94571 0.91072 0.98575 1.44841 1.72578 1.12029 1.09280 1.16017 0.78383 0.85130 0.80401 1.90842 1.59851 1.13845 1.84636 1.45098 1.69341 1.12736 1.10161 1.20763 0.98107 0.93717 0.81385 1.19038 0.92658 0.95710 0.89497 1.20298 0.88808 0.99916 1.44549 0.92339 1.24963 0.98824 0.94883 0.94245 1.69959 1.27592 1.08381 1.45141 0.86715 0.83505 0.79619 0.78464 1.21339 1.20264 1.20275 1.22967 0.96414 0.96404 1.08896 1.22525 1.02294 0.96447 0.97919 0.91657 0.92707 0.92310 0.93608 0.90506 0.95421 0.90904 0.90716 0.91819 0.91929 0.92654 0.93145 0.92496 0.92329 0.90412 0.95379 0.77329 0.77193 0.91237 0.94912 0.92846 0.90501 0.91653 0.91682 0.89996 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 -0.16 -1.82 9.51 37.16 0.35 -1.46 16 2 C 0.17 2.13 2.62 -67.93 -0.18 1.95 16 3 H 0.08 1.29 6.33 -51.93 -0.33 0.96 16 4 C 0.05 0.47 4.57 -3.83 -0.02 0.45 16 5 N -0.53 -5.89 4.31 -234.68 -1.01 -6.90 16 6 C 0.06 0.55 5.43 -3.83 -0.02 0.53 16 7 C -0.12 -1.15 6.09 -26.65 -0.16 -1.31 16 8 C -0.11 -1.13 5.29 -26.61 -0.14 -1.27 16 9 C -0.09 -1.06 2.88 -90.54 -0.26 -1.32 16 10 H 0.08 1.19 8.14 -51.93 -0.42 0.77 16 11 C -0.15 -1.53 9.20 37.16 0.34 -1.19 16 12 C 0.06 0.74 4.57 -3.84 -0.02 0.73 16 13 N -0.73 -10.78 4.78 -58.68 -0.28 -11.06 16 14 C 0.70 13.79 8.56 -86.92 -0.74 13.05 16 15 O -0.61 -14.36 15.96 5.28 0.08 -14.27 16 16 N -0.72 -14.66 5.48 -65.23 -0.36 -15.01 16 17 C 0.18 4.35 5.50 -4.04 -0.02 4.32 16 18 C 0.03 0.76 1.32 -155.66 -0.21 0.55 16 19 C -0.50 -12.93 8.58 -34.44 -0.30 -13.23 16 20 H 0.06 1.49 7.82 -52.49 -0.41 1.08 16 21 C 0.07 2.01 5.42 -17.82 -0.10 1.91 16 22 N -0.87 -24.60 13.09 55.43 0.73 -23.87 16 23 Si 0.89 20.80 29.54 -169.99 -5.02 15.77 16 24 H -0.29 -6.77 7.11 56.52 0.40 -6.36 16 25 H -0.28 -6.42 7.11 56.52 0.40 -6.02 16 26 H -0.28 -6.42 7.11 56.52 0.40 -6.02 16 27 C -0.21 -4.43 9.96 -26.73 -0.27 -4.70 16 28 C -0.15 -3.56 9.65 -26.73 -0.26 -3.82 16 29 H 0.06 0.90 8.14 -51.93 -0.42 0.48 16 30 H 0.05 0.54 8.14 -51.93 -0.42 0.12 16 31 H 0.06 0.54 8.14 -51.93 -0.42 0.12 16 32 H 0.05 0.41 8.01 -51.93 -0.42 0.00 16 33 H 0.08 0.66 7.80 -51.93 -0.41 0.25 16 34 H 0.03 0.25 8.14 -51.93 -0.42 -0.17 16 35 H 0.07 0.63 7.93 -51.93 -0.41 0.22 16 36 H 0.07 0.85 8.14 -51.93 -0.42 0.43 16 37 H 0.06 0.52 8.14 -51.93 -0.42 0.10 16 38 H 0.06 0.61 8.14 -51.93 -0.42 0.19 16 39 H 0.05 0.51 8.14 -51.93 -0.42 0.09 16 40 H 0.05 0.47 8.14 -51.93 -0.42 0.04 16 41 H 0.06 0.57 8.14 -51.93 -0.42 0.15 16 42 H 0.06 0.66 8.14 -51.93 -0.42 0.23 16 43 H 0.08 1.05 6.78 -51.93 -0.35 0.70 16 44 H 0.03 0.30 8.14 -51.93 -0.42 -0.12 16 45 H 0.39 5.08 8.64 -40.82 -0.35 4.73 16 46 H 0.39 7.41 8.35 -40.82 -0.34 7.07 16 47 H 0.07 1.89 8.14 -51.93 -0.42 1.47 16 48 H 0.03 0.77 8.09 -51.93 -0.42 0.35 16 49 H 0.26 7.11 8.32 -40.82 -0.34 6.77 16 50 H 0.08 1.59 8.14 -51.93 -0.42 1.16 16 51 H 0.06 1.28 8.14 -51.93 -0.42 0.86 16 52 H 0.06 1.44 8.14 -51.93 -0.42 1.02 16 53 H 0.08 2.00 8.14 -51.93 -0.42 1.57 16 LS Contribution 418.26 15.07 6.30 6.30 Total: -1.00 -29.90 418.26 -11.73 -41.63 By element: Atomic # 1 Polarization: 22.41 SS G_CDS: -10.18 Total: 12.23 kcal Atomic # 6 Polarization: -2.82 SS G_CDS: -1.99 Total: -4.81 kcal Atomic # 7 Polarization: -55.92 SS G_CDS: -0.93 Total: -56.85 kcal Atomic # 8 Polarization: -14.36 SS G_CDS: 0.08 Total: -14.27 kcal Atomic # 14 Polarization: 20.80 SS G_CDS: -5.02 Total: 15.77 kcal Total LS contribution 6.30 Total: 6.30 kcal Total: -29.90 -11.73 -41.63 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. ZINC000430422607.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 17.932 kcal (2) G-P(sol) polarization free energy of solvation -29.896 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -11.964 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -11.732 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -41.629 kcal (6) G-S(sol) free energy of system = (1) + (5) -23.697 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.77 seconds