Wall clock time and date at job start Tue Mar 31 2020 05:39:38 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 1.50700 * 1 3 3 C 1.38288 * 119.92333 * 2 1 4 4 C 1.38100 * 120.07872 * 179.97438 * 3 2 1 5 5 C 1.38920 * 119.92219 * 0.02562 * 4 3 2 6 6 N 1.39668 * 120.07400 * 179.97438 * 5 4 3 7 7 C 1.46850 * 110.99974 * 124.18621 * 6 5 4 8 8 C 1.53037 * 109.52282 * 174.15785 * 7 6 5 9 9 C 1.53127 * 109.27649 * 59.17839 * 8 7 6 10 10 C 1.50699 * 109.51870 * 182.44039 * 9 8 7 11 11 O 1.21291 * 120.00231 * 119.68354 * 10 9 8 12 12 N 1.34776 * 120.00199 * 299.68102 * 10 9 8 13 13 C 1.39240 * 120.00117 * 176.69847 * 12 10 9 14 14 C 1.39484 * 119.82967 * 217.49492 * 13 12 10 15 15 C 1.36379 * 120.16422 * 179.76189 * 14 13 12 16 16 C 1.40865 * 119.83195 * 0.50359 * 15 14 13 17 17 C 1.41146 * 120.16836 * 179.72192 * 16 15 14 18 18 H 1.08000 * 120.00342 * 158.00027 * 17 16 15 19 19 C 1.39903 * 119.99962 * 338.00536 * 17 16 15 20 20 N 1.30869 * 120.00264 * 327.58480 * 19 17 16 21 21 Si 1.86802 * 120.00081 * 147.58062 * 19 17 16 22 22 H 1.48496 * 109.47452 * 94.98644 * 21 19 17 23 23 H 1.48502 * 109.47098 * 214.98982 * 21 19 17 24 24 H 1.48502 * 109.47010 * 334.98475 * 21 19 17 25 25 C 1.40874 * 119.67170 * 359.74511 * 16 15 14 26 26 C 1.36381 * 119.82727 * 0.02562 * 25 16 15 27 27 C 1.53118 * 109.16091 * 302.33994 * 9 8 7 28 28 C 1.46845 * 111.00269 * 359.97399 * 6 5 4 29 29 C 1.38916 * 119.84853 * 359.96982 * 5 4 3 30 30 C 1.38097 * 119.92405 * 0.02874 * 29 5 4 31 31 H 1.08999 * 109.47289 * 90.00397 * 1 2 3 32 32 H 1.08998 * 109.46906 * 209.99745 * 1 2 3 33 33 H 1.08996 * 109.47366 * 329.99799 * 1 2 3 34 34 H 1.07998 * 119.96091 * 359.71786 * 3 2 1 35 35 H 1.07994 * 120.04496 * 179.97438 * 4 3 2 36 36 H 1.09004 * 109.46038 * 294.17415 * 7 6 5 37 37 H 1.08994 * 109.46131 * 54.14417 * 7 6 5 38 38 H 1.08999 * 109.50472 * 299.23885 * 8 7 6 39 39 H 1.08997 * 109.53409 * 179.13780 * 8 7 6 40 40 H 1.08995 * 109.57411 * 62.28178 * 9 8 7 41 41 H 0.96995 * 120.00116 * 356.69422 * 12 10 9 42 42 H 1.07995 * 119.91924 * 0.02562 * 14 13 12 43 43 H 1.08001 * 120.08322 * 180.25188 * 15 14 13 44 44 H 0.97002 * 120.00754 * 180.02562 * 20 19 17 45 45 H 1.07994 * 120.08787 * 179.97438 * 25 16 15 46 46 H 1.07995 * 119.91796 * 179.97438 * 26 25 16 47 47 H 1.08994 * 109.50771 * 297.72184 * 27 9 8 48 48 H 1.09000 * 109.53422 * 177.61535 * 27 9 8 49 49 H 1.09001 * 109.45864 * 305.85247 * 28 6 5 50 50 H 1.08996 * 109.46326 * 65.83116 * 28 6 5 51 51 H 1.08000 * 120.03667 * 180.02562 * 29 5 4 52 52 H 1.08007 * 119.95919 * 180.02562 * 30 29 5 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 2.1968 1.1985 0.0000 4 6 3.5778 1.2023 0.0005 5 6 4.2741 0.0001 0.0005 6 7 5.6707 0.0002 0.0005 7 6 6.1970 -0.7701 1.1346 8 6 7.7199 -0.8708 1.0217 9 6 8.3205 0.5378 1.0146 10 6 9.8150 0.4470 0.8434 11 8 10.3486 0.9680 -0.1132 12 7 10.5587 -0.2129 1.7532 13 6 11.9302 -0.3559 1.5597 14 6 12.5626 -1.5438 1.9267 15 6 13.9047 -1.6930 1.7357 16 6 14.6542 -0.6397 1.1762 17 6 16.0446 -0.7843 0.9809 18 1 16.5554 -0.1667 0.2569 19 6 16.7612 -1.7277 1.7251 20 7 16.3947 -2.0110 2.9491 21 14 18.2410 -2.5832 0.9717 22 1 19.4799 -1.8611 1.3577 23 1 18.3089 -3.9819 1.4659 24 1 18.1107 -2.5867 -0.5076 25 6 14.0093 0.5589 0.8129 26 6 12.6658 0.6917 1.0055 27 6 7.7199 1.3344 -0.1469 28 6 6.1970 1.3711 -0.0001 29 6 3.5779 -1.2020 0.0006 30 6 2.1970 -1.1984 0.0001 31 1 -0.3634 -0.0001 -1.0276 32 1 -0.3633 -0.8900 0.5138 33 1 -0.3634 0.8899 0.5138 34 1 1.6550 2.1327 -0.0046 35 1 4.1160 2.1386 0.0001 36 1 5.9342 -0.2697 2.0667 37 1 5.7653 -1.7708 1.1255 38 1 7.9832 -1.3833 0.0964 39 1 8.1122 -1.4294 1.8715 40 1 8.0914 1.0372 1.9559 41 1 10.1387 -0.5882 2.5428 42 1 11.9873 -2.3489 2.3591 43 1 14.3922 -2.6148 2.0166 44 1 16.8916 -2.6648 3.4652 45 1 14.5775 1.3709 0.3838 46 1 12.1700 1.6100 0.7280 47 1 7.9830 0.8565 -1.0905 48 1 8.1115 2.3515 -0.1324 49 1 5.7651 1.9255 -0.8334 50 1 5.9343 1.8614 0.9373 51 1 4.1161 -2.1384 0.0010 52 1 1.6551 -2.1327 0.0006 RHF calculation, no. of doubly occupied orbitals= 68 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 ZINC000219852826.mol2 52 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 05:39:38 Heat of formation + Delta-G solvation = 6.959899 kcal Electronic energy + Delta-G solvation = -31062.174207 eV Core-core repulsion = 26990.370391 eV Total energy + Delta-G solvation = -4071.803816 eV No. of doubly occupied orbitals = 68 Molecular weight (most abundant/longest-lived isotopes) = 364.189 amu Computer time = 1.54 seconds Orbital eigenvalues (eV) -40.82198 -39.71993 -38.16729 -37.13856 -34.50569 -34.31949 -33.01736 -31.87909 -31.33376 -30.63113 -29.56759 -29.02621 -27.03815 -25.29987 -24.43486 -24.02919 -22.04065 -21.90268 -21.22688 -20.71760 -20.04187 -19.40494 -17.88028 -17.40716 -16.83739 -16.25544 -15.94570 -15.52062 -15.22609 -15.20671 -14.84277 -14.56333 -14.27404 -14.10330 -13.98345 -13.82824 -13.70678 -13.55620 -13.32378 -12.88436 -12.66669 -12.57666 -12.51355 -12.16642 -12.07160 -12.01618 -11.73354 -11.53945 -11.44320 -11.38512 -11.26693 -11.15416 -10.95160 -10.84270 -10.64285 -10.51288 -10.14262 -9.80361 -9.73519 -9.38345 -9.21218 -9.01734 -8.68058 -7.97603 -7.55262 -7.15299 -6.89046 -4.27741 1.08576 1.13667 2.58446 2.96151 3.04650 3.09503 3.12105 3.29567 3.34140 3.60757 3.74869 3.88716 4.42703 4.47769 4.49125 4.61920 4.62063 4.73148 4.76543 4.89195 4.98385 5.05452 5.11797 5.14465 5.25241 5.26997 5.28195 5.38198 5.40508 5.46438 5.52027 5.62520 5.63627 5.69240 5.80054 5.86603 6.00020 6.06895 6.08404 6.18270 6.24853 6.35673 6.42326 6.52790 6.76294 6.77450 6.95585 6.99716 7.05716 7.14608 7.28843 7.56269 7.69747 7.89504 8.01711 8.25097 8.30072 8.54651 8.78655 8.83552 9.00402 10.01332 Molecular weight = 364.19amu Principal moments of inertia in cm(-1) A = 0.031825 B = 0.001492 C = 0.001455 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 879.612904 B =18766.686674 C =19244.981255 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.110 4.110 2 C -0.119 4.119 3 C -0.094 4.094 4 C -0.169 4.169 5 C 0.112 3.888 6 N -0.489 5.489 7 C 0.062 3.938 8 C -0.110 4.110 9 C -0.107 4.107 10 C 0.503 3.497 11 O -0.532 6.532 12 N -0.649 5.649 13 C -0.022 4.022 14 C -0.102 4.102 15 C -0.171 4.171 16 C 0.112 3.888 17 C -0.466 4.466 18 H 0.082 0.918 19 C 0.089 3.911 20 N -0.770 5.770 21 Si 0.895 3.105 22 H -0.269 1.269 23 H -0.274 1.274 24 H -0.257 1.257 25 C -0.224 4.224 26 C -0.066 4.066 27 C -0.097 4.097 28 C 0.052 3.948 29 C -0.138 4.138 30 C -0.096 4.096 31 H 0.066 0.934 32 H 0.063 0.937 33 H 0.063 0.937 34 H 0.120 0.880 35 H 0.127 0.873 36 H 0.045 0.955 37 H 0.084 0.916 38 H 0.081 0.919 39 H 0.078 0.922 40 H 0.091 0.909 41 H 0.392 0.608 42 H 0.088 0.912 43 H 0.107 0.893 44 H 0.283 0.717 45 H 0.094 0.906 46 H 0.102 0.898 47 H 0.082 0.918 48 H 0.079 0.921 49 H 0.085 0.915 50 H 0.046 0.954 51 H 0.125 0.875 52 H 0.121 0.879 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -26.817 1.434 -0.279 26.857 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 -0.167 4.167 2 C -0.120 4.120 3 C -0.113 4.113 4 C -0.190 4.190 5 C 0.014 3.986 6 N -0.203 5.203 7 C -0.063 4.063 8 C -0.148 4.148 9 C -0.129 4.129 10 C 0.289 3.711 11 O -0.409 6.409 12 N -0.291 5.291 13 C -0.114 4.114 14 C -0.122 4.122 15 C -0.191 4.191 16 C 0.110 3.890 17 C -0.493 4.493 18 H 0.100 0.900 19 C -0.133 4.133 20 N -0.393 5.393 21 Si 0.719 3.281 22 H -0.194 1.194 23 H -0.199 1.199 24 H -0.181 1.181 25 C -0.244 4.244 26 C -0.086 4.086 27 C -0.135 4.135 28 C -0.074 4.074 29 C -0.159 4.159 30 C -0.114 4.114 31 H 0.085 0.915 32 H 0.082 0.918 33 H 0.082 0.918 34 H 0.138 0.862 35 H 0.145 0.855 36 H 0.064 0.936 37 H 0.103 0.897 38 H 0.099 0.901 39 H 0.096 0.904 40 H 0.109 0.891 41 H 0.226 0.774 42 H 0.107 0.893 43 H 0.125 0.875 44 H 0.094 0.906 45 H 0.112 0.888 46 H 0.120 0.880 47 H 0.101 0.899 48 H 0.098 0.902 49 H 0.103 0.897 50 H 0.064 0.936 51 H 0.143 0.857 52 H 0.139 0.861 Dipole moment (debyes) X Y Z Total from point charges -26.126 1.446 -1.158 26.192 hybrid contribution 0.326 -0.327 0.830 0.950 sum -25.800 1.118 -0.328 25.826 Atomic orbital electron populations 1.20729 0.91405 1.02480 1.02064 1.19829 0.95969 0.93175 1.03020 1.20878 0.93698 0.97467 0.99231 1.21326 0.94660 0.97394 1.05627 1.18989 0.88157 0.93703 0.97723 1.58991 1.04342 1.15255 1.41761 1.22225 0.95318 0.98397 0.90335 1.21629 0.93630 0.95631 1.03899 1.21376 0.92595 0.97933 1.00999 1.20416 0.88398 0.79603 0.82647 1.90687 1.73414 1.45844 1.30940 1.42965 1.07447 1.55568 1.23160 1.17063 0.81134 0.96757 1.16432 1.20165 0.95409 0.94286 1.02361 1.20612 0.92034 0.99405 1.07014 1.17592 0.93190 0.89967 0.88286 1.19509 0.93082 1.17447 1.19311 0.90016 1.25932 0.98775 0.95218 0.93367 1.69943 1.37481 1.25009 1.06817 0.86518 0.81025 0.79094 0.81501 1.19449 1.19883 1.18078 1.20600 0.93853 0.97960 1.12001 1.20294 0.93572 0.96357 0.98329 1.21422 0.92185 1.01068 0.98814 1.22334 0.95913 0.87824 1.01355 1.20793 0.93977 0.96856 1.04241 1.20886 0.93649 0.97505 0.99378 0.91499 0.91795 0.91835 0.86231 0.85514 0.93624 0.89718 0.90066 0.90381 0.89129 0.77422 0.89338 0.87522 0.90608 0.88781 0.88046 0.89914 0.90246 0.89680 0.93600 0.85734 0.86056 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 17. 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 -0.11 -0.61 10.01 36.01 0.36 -0.25 16 2 C -0.12 -0.94 5.88 -104.59 -0.62 -1.56 16 3 C -0.09 -0.77 9.69 -39.61 -0.38 -1.15 16 4 C -0.17 -1.52 8.82 -39.38 -0.35 -1.87 16 5 C 0.11 1.10 5.64 -83.78 -0.47 0.62 16 6 N -0.49 -4.87 4.70 -171.14 -0.80 -5.67 16 7 C 0.06 0.55 5.26 -3.83 -0.02 0.53 16 8 C -0.11 -1.10 5.26 -26.65 -0.14 -1.24 16 9 C -0.11 -1.26 2.59 -91.65 -0.24 -1.49 16 10 C 0.50 8.48 6.97 -10.99 -0.08 8.40 16 11 O -0.53 -11.27 13.59 5.55 0.08 -11.19 16 12 N -0.65 -11.23 5.19 -9.74 -0.05 -11.28 16 13 C -0.02 -0.49 6.25 -83.57 -0.52 -1.01 16 14 C -0.10 -2.33 9.90 -39.79 -0.39 -2.72 16 15 C -0.17 -4.36 8.74 -39.26 -0.34 -4.71 16 16 C 0.11 3.02 5.57 -106.80 -0.60 2.42 16 17 C -0.47 -12.34 8.94 -37.86 -0.34 -12.68 16 18 H 0.08 2.10 8.02 -52.49 -0.42 1.68 16 19 C 0.09 2.19 4.77 -17.34 -0.08 2.11 16 20 N -0.77 -19.38 11.78 55.55 0.65 -18.72 16 21 Si 0.90 18.20 29.66 -169.99 -5.04 13.16 16 22 H -0.27 -5.36 7.11 56.52 0.40 -4.96 16 23 H -0.27 -5.42 7.11 56.52 0.40 -5.01 16 24 H -0.26 -5.27 7.11 56.52 0.40 -4.87 16 25 C -0.22 -5.75 9.74 -39.25 -0.38 -6.13 16 26 C -0.07 -1.59 8.59 -39.79 -0.34 -1.93 16 27 C -0.10 -1.11 4.68 -26.65 -0.12 -1.24 16 28 C 0.05 0.49 4.15 -3.83 -0.02 0.48 16 29 C -0.14 -1.25 9.16 -39.38 -0.36 -1.61 16 30 C -0.10 -0.78 9.69 -39.62 -0.38 -1.16 16 31 H 0.07 0.34 8.14 -51.93 -0.42 -0.09 16 32 H 0.06 0.30 8.08 -51.93 -0.42 -0.12 16 33 H 0.06 0.30 8.08 -51.93 -0.42 -0.12 16 34 H 0.12 0.75 8.06 -52.49 -0.42 0.33 16 35 H 0.13 0.99 5.81 -52.49 -0.30 0.69 16 36 H 0.05 0.38 8.14 -51.93 -0.42 -0.04 16 37 H 0.08 0.67 6.70 -51.93 -0.35 0.32 16 38 H 0.08 0.96 8.14 -51.93 -0.42 0.54 16 39 H 0.08 0.68 7.75 -51.93 -0.40 0.28 16 40 H 0.09 0.90 8.14 -51.93 -0.42 0.48 16 41 H 0.39 5.37 8.41 -40.82 -0.34 5.02 16 42 H 0.09 1.75 8.06 -52.49 -0.42 1.33 16 43 H 0.11 2.76 6.52 -52.49 -0.34 2.42 16 44 H 0.28 6.40 8.30 -40.82 -0.34 6.06 16 45 H 0.09 2.30 8.06 -52.49 -0.42 1.88 16 46 H 0.10 2.42 6.45 -52.49 -0.34 2.08 16 47 H 0.08 1.13 8.04 -51.93 -0.42 0.71 16 48 H 0.08 0.93 8.14 -51.93 -0.42 0.51 16 49 H 0.08 0.75 6.98 -51.93 -0.36 0.39 16 50 H 0.05 0.39 7.73 -51.93 -0.40 -0.01 16 51 H 0.12 1.02 7.15 -52.49 -0.38 0.64 16 52 H 0.12 0.75 8.06 -52.48 -0.42 0.33 16 LS Contribution 413.51 15.07 6.23 6.23 Total: -1.00 -30.63 413.51 -12.59 -43.22 By element: Atomic # 1 Polarization: 18.30 SS G_CDS: -7.84 Total: 10.46 kcal Atomic # 6 Polarization: -20.38 SS G_CDS: -5.82 Total: -26.20 kcal Atomic # 7 Polarization: -35.48 SS G_CDS: -0.20 Total: -35.68 kcal Atomic # 8 Polarization: -11.27 SS G_CDS: 0.08 Total: -11.19 kcal Atomic # 14 Polarization: 18.20 SS G_CDS: -5.04 Total: 13.16 kcal Total LS contribution 6.23 Total: 6.23 kcal Total: -30.63 -12.59 -43.22 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. ZINC000219852826.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 50.176 kcal (2) G-P(sol) polarization free energy of solvation -30.625 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 19.550 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -12.590 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -43.216 kcal (6) G-S(sol) free energy of system = (1) + (5) 6.960 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.54 seconds