Wall clock time and date at job start Sat Apr 11 2020 06:09:37 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 O 1.42899 * 1 3 3 C 1.42897 * 113.99893 * 2 1 4 4 C 1.53005 * 109.47371 * 54.67373 * 3 2 1 5 5 C 1.53002 * 109.47126 * 174.67065 * 3 2 1 6 6 H 1.09008 * 109.47009 * 179.97438 * 5 3 2 7 7 C 1.53001 * 109.46896 * 60.00261 * 5 3 2 8 8 N 1.46502 * 109.47256 * 299.99945 * 5 3 2 9 9 C 1.34774 * 119.99847 * 204.99919 * 8 5 3 10 10 O 1.21350 * 120.00441 * 0.02562 * 9 8 5 11 11 C 1.49456 * 119.99850 * 180.02562 * 9 8 5 12 12 O 1.21350 * 119.99708 * 359.97438 * 11 9 8 13 13 N 1.34769 * 120.00147 * 179.97438 * 11 9 8 14 14 C 1.46502 * 120.00144 * 179.97438 * 13 11 9 15 15 C 1.53002 * 109.47075 * 180.02562 * 14 13 11 16 16 C 1.52999 * 109.47288 * 300.00090 * 15 14 13 17 17 C 1.53001 * 109.47091 * 60.00405 * 15 14 13 18 18 C 1.50701 * 109.46737 * 180.02562 * 15 14 13 19 19 H 1.07993 * 120.00511 * 359.97438 * 18 15 14 20 20 C 1.37884 * 119.99829 * 180.02562 * 18 15 14 21 21 N 1.31513 * 119.99824 * 359.97438 * 20 18 15 22 22 Si 1.86798 * 120.00041 * 179.97438 * 20 18 15 23 23 H 1.48504 * 109.46919 * 359.97438 * 22 20 18 24 24 H 1.48493 * 109.47177 * 119.99736 * 22 20 18 25 25 H 1.48502 * 109.47099 * 239.99828 * 22 20 18 26 26 C 1.53001 * 109.47433 * 294.67189 * 3 2 1 27 27 C 1.52996 * 117.50001 * 135.83724 * 26 3 2 28 28 C 1.53004 * 117.49502 * 67.17797 * 26 3 2 29 29 H 1.09005 * 109.47187 * 188.12376 * 1 2 3 30 30 H 1.08997 * 109.47272 * 308.12691 * 1 2 3 31 31 H 1.08999 * 109.47021 * 68.12500 * 1 2 3 32 32 H 1.09000 * 109.46913 * 59.99622 * 4 3 2 33 33 H 1.08998 * 109.47332 * 180.02562 * 4 3 2 34 34 H 1.09001 * 109.46765 * 300.00134 * 4 3 2 35 35 H 1.08998 * 109.46981 * 299.99682 * 7 5 3 36 36 H 1.09000 * 109.47112 * 60.00090 * 7 5 3 37 37 H 1.09001 * 109.46916 * 179.97438 * 7 5 3 38 38 H 0.96999 * 119.99902 * 25.00066 * 8 5 3 39 39 H 0.97007 * 119.99970 * 0.02562 * 13 11 9 40 40 H 1.08999 * 109.47311 * 300.00298 * 14 13 11 41 41 H 1.09000 * 109.46857 * 60.00295 * 14 13 11 42 42 H 1.08996 * 109.47040 * 59.99852 * 16 15 14 43 43 H 1.08996 * 109.47274 * 180.02562 * 16 15 14 44 44 H 1.09000 * 109.47145 * 300.00250 * 16 15 14 45 45 H 1.08999 * 109.47324 * 59.99922 * 17 15 14 46 46 H 1.08996 * 109.46876 * 179.97438 * 17 15 14 47 47 H 1.09001 * 109.46535 * 299.99478 * 17 15 14 48 48 H 0.96997 * 120.00085 * 180.02562 * 21 20 18 49 49 H 1.08997 * 115.55081 * 281.51551 * 26 3 2 50 50 H 1.09005 * 117.49714 * 0.02562 * 27 26 3 51 51 H 1.08998 * 117.50222 * 145.01818 * 27 26 3 52 52 H 1.09000 * 117.49762 * 214.97892 * 28 26 3 53 53 H 1.08999 * 117.49982 * 359.97438 * 28 26 3 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 8 1.4290 0.0000 0.0000 3 6 2.0102 1.3054 0.0000 4 6 1.4556 2.1107 1.1769 5 6 3.5297 1.1872 0.1340 6 1 3.9731 2.1830 0.1335 7 6 4.0843 0.3821 -1.0429 8 7 3.8578 0.5066 1.3891 9 6 5.0527 0.7155 1.9766 10 8 5.8566 1.4677 1.4662 11 6 5.3876 0.0208 3.2568 12 8 4.5835 -0.7311 3.7674 13 7 6.5826 0.2292 3.8440 14 6 6.9107 -0.4514 5.0991 15 6 8.3151 -0.0432 5.5486 16 6 9.3297 -0.4385 4.4737 17 6 8.3623 1.4711 5.7622 18 6 8.6528 -0.7438 6.8394 19 1 7.9373 -1.4129 7.2939 20 6 9.8750 -0.5298 7.4407 21 7 10.7463 0.2853 6.8874 22 14 10.2934 -1.3977 9.0410 23 1 9.1519 -2.2537 9.4529 24 1 11.5000 -2.2410 8.8461 25 1 10.5605 -0.3879 10.0966 26 6 1.6676 2.0163 -1.3108 27 6 1.2215 3.4774 -1.2264 28 6 0.2021 2.3833 -1.5533 29 1 -0.3634 -1.0174 0.1452 30 1 -0.3634 0.6345 0.8084 31 1 -0.3633 0.3829 -0.9537 32 1 1.6997 1.6042 2.1107 33 1 1.8986 3.1066 1.1766 34 1 0.3731 2.1949 1.0815 35 1 3.6410 -0.6137 -1.0429 36 1 3.8402 0.8885 -1.9768 37 1 5.1669 0.2982 -0.9477 38 1 3.2151 -0.0944 1.7973 39 1 7.2252 0.8305 3.4359 40 1 6.1882 -0.1694 5.8650 41 1 6.8767 -1.5302 4.9471 42 1 9.0855 0.0678 3.5399 43 1 10.3302 -0.1482 4.7941 44 1 9.2961 -1.5173 4.3216 45 1 7.6395 1.7527 6.5279 46 1 9.3626 1.7618 6.0828 47 1 8.1182 1.9774 4.8283 48 1 11.6062 0.4356 7.3102 49 1 2.2620 1.7206 -2.1753 50 1 1.1726 3.9323 -0.2371 51 1 1.5223 4.1430 -2.0355 52 1 -0.1674 2.3295 -2.5773 53 1 -0.5179 2.1178 -0.7792 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 ZINC000422486919.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 06:09:37 Heat of formation + Delta-G solvation = -86.655418 kcal Electronic energy + Delta-G solvation = -31045.611923 eV Core-core repulsion = 26918.892003 eV Total energy + Delta-G solvation = -4126.719920 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.220 amu Computer time = 0.67 seconds Orbital eigenvalues (eV) -40.94519 -39.99180 -38.28162 -36.45874 -36.32185 -35.50561 -33.31662 -31.50650 -30.86853 -30.03568 -27.42238 -26.36946 -25.70669 -25.29941 -24.54517 -23.99455 -22.89305 -21.86402 -20.22206 -19.65907 -18.95829 -18.28753 -17.12577 -16.58132 -16.32939 -16.00818 -15.74774 -15.52671 -15.21353 -14.96331 -14.79124 -14.45882 -14.15738 -14.01979 -13.48890 -13.41097 -13.10219 -12.91872 -12.68976 -12.64088 -12.41939 -12.38523 -12.20231 -12.00862 -11.63645 -11.41010 -11.38698 -11.33392 -11.19861 -11.13290 -10.88235 -10.66637 -10.66303 -10.52221 -10.38713 -10.18957 -9.79859 -9.63722 -9.50457 -9.25968 -9.17065 -8.77811 -8.56819 -8.36060 -6.01684 -4.12224 1.71251 2.58695 3.12996 3.27633 3.36299 3.40520 3.47532 3.57550 3.92196 4.22787 4.24236 4.39239 4.40886 4.51406 4.59197 4.81949 4.87639 4.97610 5.07302 5.12133 5.16368 5.18224 5.24984 5.33439 5.36482 5.41316 5.46572 5.51654 5.65126 5.70996 5.75808 5.86973 6.11819 6.13958 6.25898 6.27041 6.49097 6.66479 6.82016 6.85628 6.86956 6.96292 7.02098 7.20186 7.35422 7.56655 7.69361 7.77569 8.01595 8.02419 8.14952 8.35289 8.44639 8.88292 9.53575 10.99755 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.027928 B = 0.002097 C = 0.002051 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1002.349038 B =13346.968552 C =13646.885007 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.016 3.984 2 O -0.369 6.369 3 C 0.140 3.860 4 C -0.188 4.188 5 C 0.163 3.837 6 H 0.103 0.897 7 C -0.164 4.164 8 N -0.695 5.695 9 C 0.508 3.492 10 O -0.522 6.522 11 C 0.495 3.505 12 O -0.535 6.535 13 N -0.681 5.681 14 C 0.128 3.872 15 C 0.055 3.945 16 C -0.133 4.133 17 C -0.133 4.133 18 C -0.505 4.505 19 H 0.059 0.941 20 C 0.066 3.934 21 N -0.884 5.884 22 Si 0.894 3.106 23 H -0.273 1.273 24 H -0.284 1.284 25 H -0.285 1.285 26 C -0.178 4.178 27 C -0.176 4.176 28 C -0.181 4.181 29 H 0.083 0.917 30 H 0.046 0.954 31 H 0.054 0.946 32 H 0.072 0.928 33 H 0.075 0.925 34 H 0.066 0.934 35 H 0.068 0.932 36 H 0.067 0.933 37 H 0.063 0.937 38 H 0.416 0.584 39 H 0.411 0.589 40 H 0.061 0.939 41 H 0.061 0.939 42 H 0.009 0.991 43 H 0.087 0.913 44 H 0.027 0.973 45 H 0.027 0.973 46 H 0.087 0.913 47 H 0.009 0.991 48 H 0.260 0.740 49 H 0.117 0.883 50 H 0.103 0.897 51 H 0.097 0.903 52 H 0.097 0.903 53 H 0.100 0.900 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -20.069 4.984 -17.590 27.148 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 -0.080 4.080 2 O -0.288 6.288 3 C 0.100 3.900 4 C -0.246 4.246 5 C 0.058 3.942 6 H 0.121 0.879 7 C -0.222 4.222 8 N -0.350 5.350 9 C 0.289 3.711 10 O -0.398 6.398 11 C 0.274 3.726 12 O -0.413 6.413 13 N -0.332 5.332 14 C 0.006 3.994 15 C 0.054 3.946 16 C -0.191 4.191 17 C -0.191 4.191 18 C -0.544 4.544 19 H 0.077 0.923 20 C -0.136 4.136 21 N -0.523 5.523 22 Si 0.722 3.278 23 H -0.198 1.198 24 H -0.211 1.211 25 H -0.211 1.211 26 C -0.197 4.197 27 C -0.213 4.213 28 C -0.217 4.217 29 H 0.102 0.898 30 H 0.065 0.935 31 H 0.072 0.928 32 H 0.091 0.909 33 H 0.094 0.906 34 H 0.085 0.915 35 H 0.087 0.913 36 H 0.086 0.914 37 H 0.082 0.918 38 H 0.253 0.747 39 H 0.248 0.752 40 H 0.079 0.921 41 H 0.080 0.920 42 H 0.028 0.972 43 H 0.105 0.895 44 H 0.046 0.954 45 H 0.046 0.954 46 H 0.106 0.894 47 H 0.028 0.972 48 H 0.070 0.930 49 H 0.135 0.865 50 H 0.121 0.879 51 H 0.115 0.885 52 H 0.115 0.885 53 H 0.118 0.882 Dipole moment (debyes) X Y Z Total from point charges -19.735 4.889 -17.526 26.842 hybrid contribution 0.026 -0.246 0.788 0.826 sum -19.708 4.643 -16.737 26.270 Atomic orbital electron populations 1.23111 0.81427 1.02769 1.00739 1.87974 1.19731 1.26227 1.94828 1.21144 0.92601 0.83652 0.92635 1.22594 1.01715 1.01401 0.98844 1.20948 0.91286 0.97973 0.83976 0.87890 1.22182 1.01829 1.01197 0.96950 1.45749 1.17415 1.47562 1.24228 1.20486 0.82462 0.82268 0.85839 1.90744 1.47964 1.36210 1.64874 1.19979 0.83774 0.83339 0.85463 1.90726 1.48604 1.37131 1.64823 1.46213 1.15629 1.45965 1.25429 1.21931 0.99534 0.95926 0.81969 1.18391 0.87680 0.93631 0.94859 1.21852 1.03876 0.98215 0.95166 1.21853 1.03531 0.96868 0.96856 1.20989 1.00891 1.26511 1.06014 0.92306 1.24893 0.96191 0.95061 0.97440 1.69818 1.07458 1.36013 1.38977 0.86502 0.78347 0.79471 0.83471 1.19764 1.21066 1.21079 1.22907 0.98754 0.98345 0.99689 1.23175 1.03363 0.91046 1.03747 1.23173 0.91988 1.03573 1.03001 0.89836 0.93529 0.92755 0.90947 0.90620 0.91514 0.91258 0.91430 0.91761 0.74671 0.75215 0.92056 0.92025 0.97245 0.89458 0.95352 0.95373 0.89448 0.97247 0.93015 0.86549 0.87895 0.88477 0.88472 0.88190 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 12. 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 0.02 0.10 9.26 101.05 0.94 1.04 16 2 O -0.37 -3.38 9.18 -35.23 -0.32 -3.70 16 3 C 0.14 1.16 0.48 -90.62 -0.04 1.12 16 4 C -0.19 -1.48 6.66 37.16 0.25 -1.23 16 5 C 0.16 1.69 1.94 -67.93 -0.13 1.55 16 6 H 0.10 1.13 7.58 -51.92 -0.39 0.74 16 7 C -0.16 -1.63 9.08 37.16 0.34 -1.29 16 8 N -0.70 -8.71 4.35 -54.23 -0.24 -8.95 16 9 C 0.51 7.93 7.85 -11.58 -0.09 7.84 16 10 O -0.52 -8.99 16.14 5.50 0.09 -8.90 16 11 C 0.50 8.87 7.89 -11.59 -0.09 8.78 16 12 O -0.53 -10.48 16.48 5.50 0.09 -10.39 16 13 N -0.68 -12.83 4.95 -60.73 -0.30 -13.13 16 14 C 0.13 2.71 4.50 -4.04 -0.02 2.70 16 15 C 0.06 1.29 0.50 -155.66 -0.08 1.21 16 16 C -0.13 -3.08 8.08 37.16 0.30 -2.78 16 17 C -0.13 -3.07 8.08 37.16 0.30 -2.77 16 18 C -0.51 -13.17 8.01 -34.44 -0.28 -13.44 16 19 H 0.06 1.54 7.74 -52.49 -0.41 1.13 16 20 C 0.07 1.72 5.15 -17.82 -0.09 1.63 16 21 N -0.88 -23.67 9.35 55.43 0.52 -23.15 16 22 Si 0.89 20.69 29.54 -169.99 -5.02 15.67 16 23 H -0.27 -6.30 7.11 56.52 0.40 -5.90 16 24 H -0.28 -6.59 7.11 56.52 0.40 -6.19 16 25 H -0.28 -6.59 7.11 56.52 0.40 -6.19 16 26 C -0.18 -1.22 4.97 -90.62 -0.45 -1.67 16 27 C -0.18 -1.04 9.69 -26.69 -0.26 -1.29 16 28 C -0.18 -0.99 7.86 -26.69 -0.21 -1.20 16 29 H 0.08 0.50 8.14 -51.93 -0.42 0.08 16 30 H 0.05 0.28 5.77 -51.93 -0.30 -0.02 16 31 H 0.05 0.31 5.28 -51.93 -0.27 0.03 16 32 H 0.07 0.66 7.45 -51.93 -0.39 0.27 16 33 H 0.07 0.57 6.65 -51.93 -0.35 0.22 16 34 H 0.07 0.43 5.13 -51.93 -0.27 0.16 16 35 H 0.07 0.72 7.68 -51.93 -0.40 0.32 16 36 H 0.07 0.54 6.21 -51.93 -0.32 0.22 16 37 H 0.06 0.74 8.14 -51.93 -0.42 0.32 16 38 H 0.42 5.16 7.46 -40.82 -0.30 4.86 16 39 H 0.41 7.61 5.64 -40.82 -0.23 7.38 16 40 H 0.06 1.33 8.14 -51.93 -0.42 0.90 16 41 H 0.06 1.34 8.14 -51.93 -0.42 0.92 16 42 H 0.01 0.18 6.86 -51.93 -0.36 -0.17 16 43 H 0.09 2.21 6.07 -51.93 -0.32 1.90 16 44 H 0.03 0.64 8.14 -51.93 -0.42 0.21 16 45 H 0.03 0.63 8.14 -51.93 -0.42 0.21 16 46 H 0.09 2.21 6.07 -51.93 -0.32 1.90 16 47 H 0.01 0.18 6.86 -51.93 -0.36 -0.18 16 48 H 0.26 6.69 8.31 -40.82 -0.34 6.36 16 49 H 0.12 0.80 6.19 -51.93 -0.32 0.48 16 50 H 0.10 0.60 5.89 -51.93 -0.31 0.29 16 51 H 0.10 0.51 8.14 -51.93 -0.42 0.08 16 52 H 0.10 0.46 8.14 -51.93 -0.42 0.04 16 53 H 0.10 0.51 5.14 -51.93 -0.27 0.24 16 LS Contribution 400.41 15.07 6.03 6.03 Total: -1.00 -28.57 400.41 -7.15 -35.72 By element: Atomic # 1 Polarization: 18.99 SS G_CDS: -8.38 Total: 10.60 kcal Atomic # 6 Polarization: -0.18 SS G_CDS: 0.38 Total: 0.20 kcal Atomic # 7 Polarization: -45.21 SS G_CDS: -0.02 Total: -45.23 kcal Atomic # 8 Polarization: -22.85 SS G_CDS: -0.14 Total: -22.99 kcal Atomic # 14 Polarization: 20.69 SS G_CDS: -5.02 Total: 15.67 kcal Total LS contribution 6.03 Total: 6.03 kcal Total: -28.57 -7.15 -35.72 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. ZINC000422486919.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 -50.936 kcal (2) G-P(sol) polarization free energy of solvation -28.569 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -79.505 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -7.151 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -35.720 kcal (6) G-S(sol) free energy of system = (1) + (5) -86.655 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.67 seconds