Wall clock time and date at job start Wed Apr 1 2020 02:59:00 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 1.50701 * 1 3 3 C 1.38260 * 120.00106 * 2 1 4 4 C 1.38212 * 120.00041 * 179.97438 * 3 2 1 5 5 C 1.38258 * 120.00085 * 359.73665 * 4 3 2 6 6 C 1.38211 * 119.99784 * 0.52159 * 5 4 3 7 7 C 1.38214 * 120.00231 * 179.97438 * 2 1 3 8 8 C 1.50703 * 119.99514 * 0.02562 * 7 2 1 9 9 C 1.52998 * 109.47413 * 85.02077 * 8 7 2 10 10 C 1.50699 * 109.46987 * 179.97438 * 9 8 7 11 11 O 1.21276 * 120.00137 * 0.02562 * 10 9 8 12 12 N 1.34780 * 119.99947 * 180.02562 * 10 9 8 13 13 C 1.49218 * 126.05481 * 0.02562 * 12 10 9 14 14 C 1.50352 * 104.85765 * 172.93234 * 13 12 10 15 15 H 1.08991 * 110.04961 * 279.54296 * 14 13 12 16 16 C 1.50991 * 125.56515 * 144.32977 * 14 13 12 17 17 C 1.56405 * 101.59508 * 203.98047 * 16 14 13 18 18 C 1.55945 * 105.78617 * 25.01930 * 17 16 14 19 19 H 1.08999 * 110.49378 * 248.73737 * 18 17 16 20 20 N 1.46508 * 110.49272 * 126.20724 * 18 17 16 21 21 C 1.36939 * 119.99751 * 86.45356 * 20 18 17 22 22 H 1.08004 * 119.99937 * 359.97438 * 21 20 18 23 23 C 1.38805 * 119.99732 * 180.02562 * 21 20 18 24 24 N 1.31622 * 120.00456 * 0.02562 * 23 21 20 25 25 Si 1.86806 * 119.99786 * 180.02562 * 23 21 20 26 26 H 1.48498 * 109.47098 * 59.99923 * 25 23 21 27 27 H 1.48501 * 109.46968 * 179.97438 * 25 23 21 28 28 H 1.48501 * 109.47070 * 299.99508 * 25 23 21 29 29 C 1.50297 * 104.15443 * 7.54249 * 18 17 16 30 30 H 1.08999 * 110.00034 * 80.49506 * 29 18 17 31 31 C 1.49697 * 126.06137 * 179.71935 * 12 10 9 32 32 H 1.08998 * 109.46845 * 270.02169 * 1 2 3 33 33 H 1.08997 * 109.46777 * 30.02183 * 1 2 3 34 34 H 1.08999 * 109.46887 * 150.02224 * 1 2 3 35 35 H 1.08001 * 119.99581 * 359.97438 * 3 2 1 36 36 H 1.08004 * 119.99477 * 180.02562 * 4 3 2 37 37 H 1.07998 * 119.99823 * 180.27809 * 5 4 3 38 38 H 1.08002 * 120.00200 * 179.76459 * 6 5 4 39 39 H 1.09007 * 109.46568 * 205.02353 * 8 7 2 40 40 H 1.09002 * 109.47211 * 325.01705 * 8 7 2 41 41 H 1.08992 * 109.47088 * 300.00061 * 9 8 7 42 42 H 1.08997 * 109.46816 * 59.99784 * 9 8 7 43 43 H 1.09001 * 110.36475 * 291.78164 * 13 12 10 44 44 H 1.09000 * 110.36005 * 54.08948 * 13 12 10 45 45 H 1.08999 * 111.00736 * 322.06082 * 16 14 13 46 46 H 1.09004 * 111.00653 * 85.86751 * 16 14 13 47 47 H 1.09000 * 110.18763 * 144.09792 * 17 16 14 48 48 H 1.08996 * 110.18905 * 265.94081 * 17 16 14 49 49 H 0.96993 * 119.99747 * 266.45330 * 20 18 17 50 50 H 0.96993 * 120.00248 * 180.02562 * 24 23 21 51 51 H 1.08997 * 110.84062 * 273.06008 * 31 12 10 52 52 H 1.09006 * 110.84185 * 36.66706 * 31 12 10 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 1.5070 0.0000 0.0000 3 6 2.1983 1.1974 0.0000 4 6 3.5804 1.1973 0.0005 5 6 4.2717 0.0000 0.0066 6 6 3.5807 -1.1969 0.0012 7 6 2.1981 -1.1969 0.0005 8 6 1.4446 -2.5020 0.0005 9 6 1.0816 -2.8815 -1.4365 10 6 0.3286 -4.1869 -1.4365 11 8 0.1039 -4.7573 -0.3901 12 7 -0.0951 -4.7204 -2.5993 13 6 0.1063 -4.1375 -3.9581 14 6 -0.3900 -5.1924 -4.9076 15 1 0.3732 -5.9577 -5.0479 16 6 -1.1093 -4.9336 -6.2097 17 6 -1.8962 -6.2711 -6.4052 18 6 -2.0803 -6.8678 -4.9763 19 1 -1.4845 -7.7733 -4.8612 20 7 -3.4944 -7.1493 -4.7163 21 6 -4.0358 -8.3473 -5.0997 22 1 -3.4204 -9.0844 -5.5942 23 6 -5.3756 -8.6137 -4.8539 24 7 -6.1259 -7.7148 -4.2526 25 14 -6.1140 -10.2482 -5.3763 26 1 -5.3970 -11.3557 -4.6947 27 1 -7.5506 -10.2847 -5.0017 28 1 -5.9814 -10.4037 -6.8472 29 6 -1.5818 -5.7863 -4.0593 30 1 -2.3536 -5.0290 -3.9220 31 6 -0.8456 -6.0060 -2.7573 32 1 -0.3633 0.0004 1.0277 33 1 -0.3633 0.8898 -0.5142 34 1 -0.3633 -0.8902 -0.5135 35 1 1.6583 2.1326 -0.0004 36 1 4.1204 2.1327 0.0010 37 1 5.3517 0.0001 0.0115 38 1 4.1207 -2.1323 0.0021 39 1 2.0692 -3.2822 0.4357 40 1 0.5335 -2.3955 0.5894 41 1 0.4571 -2.1013 -1.8716 42 1 1.9927 -2.9880 -2.0253 43 1 -0.4765 -3.2231 -4.0688 44 1 1.1636 -3.9377 -4.1321 45 1 -1.7918 -4.0887 -6.1179 46 1 -0.4008 -4.7742 -7.0226 47 1 -2.8677 -6.0732 -6.8582 48 1 -1.3227 -6.9573 -7.0284 49 1 -4.0470 -6.4871 -4.2726 50 1 -7.0621 -7.9012 -4.0805 51 1 -0.1589 -6.8490 -2.8344 52 1 -1.5467 -6.1494 -1.9350 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 ZINC001026366367.mol2 52 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Wed Apr 1 2020 02:59:00 Heat of formation + Delta-G solvation = 2.548710 kcal Electronic energy + Delta-G solvation = -29354.078145 eV Core-core repulsion = 25511.223848 eV Total energy + Delta-G solvation = -3842.854297 eV No. of doubly occupied orbitals = 65 Molecular weight (most abundant/longest-lived isotopes) = 342.205 amu Computer time = 1.40 seconds Orbital eigenvalues (eV) -40.59117 -39.88277 -38.61860 -35.33092 -34.44318 -33.39287 -32.70602 -30.93380 -30.57466 -29.10839 -28.47938 -27.23145 -25.59217 -24.70735 -23.21455 -22.67741 -22.12341 -20.73293 -20.22983 -19.20062 -19.00078 -17.23310 -16.93476 -16.57668 -16.27868 -16.16670 -15.31507 -15.15208 -14.82993 -14.67292 -14.21909 -13.92222 -13.88507 -13.82324 -13.43766 -13.22106 -13.05214 -12.89001 -12.70851 -12.56522 -12.41884 -12.20606 -11.97565 -11.88010 -11.59006 -11.50699 -11.38845 -11.11291 -11.04436 -11.01244 -10.78418 -10.78021 -10.47154 -10.18527 -10.14789 -9.85447 -9.72548 -9.56622 -9.06310 -8.91637 -8.81479 -8.61673 -6.97944 -5.77837 -3.07161 1.06731 1.11613 2.68552 2.89660 3.43422 3.47991 3.48271 3.48966 4.09094 4.38329 4.53065 4.57312 4.65108 4.72468 4.77325 4.83491 4.90113 4.93226 5.04475 5.15407 5.22039 5.25328 5.29394 5.36326 5.38525 5.42021 5.45423 5.55675 5.56308 5.60067 5.64462 5.72272 5.75512 5.84889 5.90941 5.92078 5.98222 6.02734 6.04703 6.12448 6.20256 6.23126 6.24163 6.33065 6.34483 6.42697 6.49644 6.62674 6.75302 6.77337 7.05058 7.55867 7.69092 8.19840 8.40375 9.51574 10.08291 10.42705 11.44490 Molecular weight = 342.20amu Principal moments of inertia in cm(-1) A = 0.020942 B = 0.001979 C = 0.001925 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1336.696666 B =14147.942242 C =14538.681586 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.122 4.122 2 C -0.080 4.080 3 C -0.120 4.120 4 C -0.122 4.122 5 C -0.126 4.126 6 C -0.112 4.112 7 C -0.081 4.081 8 C -0.067 4.067 9 C -0.129 4.129 10 C 0.526 3.474 11 O -0.544 6.544 12 N -0.626 5.626 13 C 0.122 3.878 14 C -0.130 4.130 15 H 0.081 0.919 16 C -0.097 4.097 17 C -0.144 4.144 18 C 0.196 3.804 19 H 0.054 0.946 20 N -0.720 5.720 21 C -0.241 4.241 22 H 0.070 0.930 23 C -0.012 4.012 24 N -0.932 5.932 25 Si 0.907 3.093 26 H -0.286 1.286 27 H -0.291 1.291 28 H -0.286 1.286 29 C -0.117 4.117 30 H 0.082 0.918 31 C 0.128 3.872 32 H 0.072 0.928 33 H 0.066 0.934 34 H 0.071 0.929 35 H 0.120 0.880 36 H 0.119 0.881 37 H 0.120 0.880 38 H 0.122 0.878 39 H 0.079 0.921 40 H 0.083 0.917 41 H 0.093 0.907 42 H 0.092 0.908 43 H 0.069 0.931 44 H 0.069 0.931 45 H 0.065 0.935 46 H 0.059 0.941 47 H 0.074 0.926 48 H 0.054 0.946 49 H 0.384 0.616 50 H 0.256 0.744 51 H 0.070 0.930 52 H 0.082 0.918 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 20.459 18.172 4.082 27.667 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 -0.179 4.179 2 C -0.080 4.080 3 C -0.138 4.138 4 C -0.140 4.140 5 C -0.144 4.144 6 C -0.131 4.131 7 C -0.081 4.081 8 C -0.105 4.105 9 C -0.169 4.169 10 C 0.315 3.685 11 O -0.421 6.421 12 N -0.361 5.361 13 C 0.000 4.000 14 C -0.149 4.149 15 H 0.099 0.901 16 C -0.135 4.135 17 C -0.185 4.185 18 C 0.085 3.915 19 H 0.072 0.928 20 N -0.360 5.360 21 C -0.372 4.372 22 H 0.088 0.912 23 C -0.209 4.209 24 N -0.580 5.580 25 Si 0.738 3.262 26 H -0.213 1.213 27 H -0.217 1.217 28 H -0.213 1.213 29 C -0.137 4.137 30 H 0.100 0.900 31 C 0.007 3.993 32 H 0.091 0.909 33 H 0.085 0.915 34 H 0.090 0.910 35 H 0.138 0.862 36 H 0.137 0.863 37 H 0.138 0.862 38 H 0.140 0.860 39 H 0.098 0.902 40 H 0.101 0.899 41 H 0.111 0.889 42 H 0.110 0.890 43 H 0.088 0.912 44 H 0.088 0.912 45 H 0.084 0.916 46 H 0.078 0.922 47 H 0.093 0.907 48 H 0.073 0.927 49 H 0.218 0.782 50 H 0.066 0.934 51 H 0.088 0.912 52 H 0.101 0.899 Dipole moment (debyes) X Y Z Total from point charges 20.291 17.716 4.694 27.342 hybrid contribution -0.550 -0.576 -0.287 0.847 sum 19.741 17.139 4.407 26.512 Atomic orbital electron populations 1.20907 0.91153 1.03087 1.02703 1.19833 0.96117 0.92591 0.99454 1.21037 0.94281 0.97442 1.01062 1.21118 0.94324 0.98016 1.00576 1.21116 0.99788 0.92548 1.00917 1.21081 0.93588 0.98215 1.00167 1.19793 0.93659 0.94522 1.00160 1.20355 1.00879 0.93612 0.95610 1.21632 1.01134 0.95194 0.98965 1.20300 0.79268 0.86631 0.82311 1.90716 1.57530 1.63222 1.30653 1.49922 1.56410 1.23918 1.05865 1.21259 1.00433 0.96643 0.81672 1.22176 0.98383 0.98333 0.96034 0.90060 1.21735 0.98045 0.99148 0.94558 1.23808 1.00038 0.94543 1.00065 1.20097 0.87354 0.93837 0.90259 0.92825 1.42485 1.04502 1.18344 1.70704 1.19189 0.93055 0.93296 1.31681 0.91194 1.24749 0.96591 0.98158 1.01364 1.69646 1.06778 1.34342 1.47255 0.86281 0.78185 0.83618 0.78166 1.21258 1.21730 1.21286 1.22545 0.96514 1.00911 0.93723 0.90010 1.21574 0.94531 0.84852 0.98348 0.90936 0.91475 0.91002 0.86168 0.86276 0.86225 0.86035 0.90196 0.89869 0.88871 0.88977 0.91237 0.91227 0.91611 0.92187 0.90708 0.92709 0.78170 0.93437 0.91212 0.89918 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 -0.12 -0.95 9.22 36.01 0.33 -0.62 16 2 C -0.08 -0.71 5.88 -104.62 -0.62 -1.32 16 3 C -0.12 -0.97 9.70 -39.58 -0.38 -1.35 16 4 C -0.12 -0.93 10.05 -39.58 -0.40 -1.33 16 5 C -0.13 -0.97 10.05 -39.58 -0.40 -1.37 16 6 C -0.11 -0.96 9.68 -39.58 -0.38 -1.34 16 7 C -0.08 -0.75 5.13 -104.62 -0.54 -1.29 16 8 C -0.07 -0.67 3.94 -27.88 -0.11 -0.78 16 9 C -0.13 -1.26 4.72 -27.88 -0.13 -1.39 16 10 C 0.53 7.26 7.88 -10.98 -0.09 7.17 16 11 O -0.54 -9.63 16.31 5.56 0.09 -9.54 16 12 N -0.63 -8.37 3.42 -171.40 -0.59 -8.96 16 13 C 0.12 1.29 6.41 -3.85 -0.02 1.26 16 14 C -0.13 -1.56 2.76 -90.27 -0.25 -1.81 16 15 H 0.08 0.97 8.14 -51.93 -0.42 0.54 16 16 C -0.10 -1.20 6.72 -25.91 -0.17 -1.37 16 17 C -0.14 -2.32 6.74 -23.33 -0.16 -2.48 16 18 C 0.20 3.65 3.39 -67.70 -0.23 3.42 16 19 H 0.05 1.03 8.11 -51.93 -0.42 0.61 16 20 N -0.72 -17.40 5.12 -53.20 -0.27 -17.67 16 21 C -0.24 -6.53 9.97 -15.06 -0.15 -6.68 16 22 H 0.07 1.84 7.83 -52.48 -0.41 1.43 16 23 C -0.01 -0.35 5.50 -17.43 -0.10 -0.45 16 24 N -0.93 -27.90 13.06 55.49 0.72 -27.18 16 25 Si 0.91 22.22 29.55 -169.99 -5.02 17.20 16 26 H -0.29 -6.92 7.11 56.52 0.40 -6.52 16 27 H -0.29 -7.23 7.11 56.52 0.40 -6.83 16 28 H -0.29 -6.88 7.11 56.52 0.40 -6.48 16 29 C -0.12 -1.83 2.42 -90.20 -0.22 -2.05 16 30 H 0.08 1.40 7.92 -51.93 -0.41 0.99 16 31 C 0.13 1.99 6.82 -3.18 -0.02 1.96 16 32 H 0.07 0.54 8.14 -51.93 -0.42 0.12 16 33 H 0.07 0.44 8.09 -51.93 -0.42 0.02 16 34 H 0.07 0.59 5.43 -51.93 -0.28 0.31 16 35 H 0.12 0.76 8.06 -52.49 -0.42 0.34 16 36 H 0.12 0.66 8.06 -52.48 -0.42 0.24 16 37 H 0.12 0.69 8.06 -52.49 -0.42 0.27 16 38 H 0.12 0.88 8.06 -52.49 -0.42 0.46 16 39 H 0.08 0.84 8.01 -51.93 -0.42 0.43 16 40 H 0.08 0.91 6.95 -51.93 -0.36 0.55 16 41 H 0.09 0.81 6.91 -51.93 -0.36 0.45 16 42 H 0.09 0.76 8.14 -51.93 -0.42 0.34 16 43 H 0.07 0.68 8.14 -51.93 -0.42 0.25 16 44 H 0.07 0.59 8.14 -51.93 -0.42 0.17 16 45 H 0.07 0.82 8.14 -51.93 -0.42 0.39 16 46 H 0.06 0.63 8.14 -51.93 -0.42 0.21 16 47 H 0.07 1.39 7.98 -51.93 -0.41 0.98 16 48 H 0.05 0.83 8.14 -51.93 -0.42 0.41 16 49 H 0.38 9.99 7.64 -40.82 -0.31 9.68 16 50 H 0.26 7.46 8.31 -40.82 -0.34 7.12 16 51 H 0.07 1.05 8.14 -51.93 -0.42 0.63 16 52 H 0.08 1.47 8.09 -51.93 -0.42 1.05 16 LS Contribution 412.54 15.07 6.22 6.22 Total: -1.00 -31.88 412.54 -11.74 -43.62 By element: Atomic # 1 Polarization: 16.99 SS G_CDS: -8.86 Total: 8.13 kcal Atomic # 6 Polarization: -7.78 SS G_CDS: -4.03 Total: -11.82 kcal Atomic # 7 Polarization: -53.68 SS G_CDS: -0.13 Total: -53.81 kcal Atomic # 8 Polarization: -9.63 SS G_CDS: 0.09 Total: -9.54 kcal Atomic # 14 Polarization: 22.22 SS G_CDS: -5.02 Total: 17.20 kcal Total LS contribution 6.22 Total: 6.22 kcal Total: -31.88 -11.74 -43.62 kcal The number of atoms in the molecule is 52 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. ZINC001026366367.mol2 52 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 46.169 kcal (2) G-P(sol) polarization free energy of solvation -31.879 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 14.290 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -11.741 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -43.620 kcal (6) G-S(sol) free energy of system = (1) + (5) 2.549 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.40 seconds