Wall clock time and date at job start Sat Mar 6 2021 15:36:20 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= 0 * 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 1.45199 * 1 3 3 C 1.34234 * 116.99947 * 2 1 4 4 O 1.20822 * 120.00090 * 0.02562 * 3 2 1 5 5 C 1.50702 * 119.99997 * 179.72219 * 3 2 1 6 6 H 1.09004 * 112.84690 * 48.80531 * 5 3 2 7 7 C 1.53778 * 113.61409 * 180.02562 * 5 3 2 8 8 C 1.53778 * 87.07880 * 139.98529 * 7 5 3 9 9 H 1.09002 * 113.61677 * 89.12041 * 8 7 5 10 10 N 1.46503 * 113.61357 * 219.93557 * 8 7 5 11 11 C 1.34775 * 120.00605 * 205.00223 * 10 8 7 12 12 O 1.21559 * 119.99658 * 359.97438 * 11 10 8 13 13 C 1.47841 * 120.00350 * 179.97438 * 11 10 8 14 14 C 1.39562 * 120.14310 * 179.71913 * 13 11 10 15 15 C 1.37975 * 119.85269 * 179.81163 * 14 13 11 16 16 C 1.50696 * 119.93209 * 180.21031 * 15 14 13 17 17 O 1.42902 * 109.47045 * 270.23658 * 16 15 14 18 18 C 1.35901 * 116.99852 * 179.97438 * 17 16 15 19 19 C 1.38707 * 120.05353 * 180.02562 * 18 17 16 20 20 C 1.38173 * 119.94226 * 179.97438 * 19 18 17 21 21 C 1.50701 * 119.97226 * 180.02562 * 20 19 18 22 22 O 1.42906 * 109.47194 * 300.00330 * 21 20 19 23 23 Si 1.86295 * 109.47123 * 180.02562 * 21 20 19 24 24 C 1.38246 * 120.05465 * 0.02562 * 20 19 18 25 25 C 1.38283 * 120.11312 * 0.02562 * 24 20 19 26 26 C 1.38127 * 120.05302 * 359.68909 * 25 24 20 27 27 C 1.38339 * 120.14419 * 0.44689 * 15 14 13 28 28 C 1.38385 * 120.29006 * 359.78533 * 27 15 14 29 29 C 1.37928 * 120.14665 * 0.02562 * 28 27 15 30 30 C 1.53779 * 113.61510 * 277.50185 * 5 3 2 31 31 H 1.08997 * 109.46967 * 299.99772 * 1 2 3 32 32 H 1.09002 * 109.46640 * 59.99976 * 1 2 3 33 33 H 1.08997 * 109.46765 * 179.97438 * 1 2 3 34 34 H 1.09001 * 113.61184 * 254.53062 * 7 5 3 35 35 H 1.08992 * 113.61407 * 25.43168 * 7 5 3 36 36 H 0.97003 * 119.99874 * 24.99236 * 10 8 7 37 37 H 1.07997 * 120.07265 * 0.02629 * 14 13 11 38 38 H 1.09006 * 109.46994 * 30.23327 * 16 15 14 39 39 H 1.08992 * 109.47531 * 150.23059 * 16 15 14 40 40 H 1.08000 * 120.03216 * 359.97225 * 19 18 17 41 41 H 1.08998 * 109.46776 * 60.00404 * 21 20 19 42 42 H 0.96701 * 113.99753 * 300.00223 * 22 21 20 43 43 H 1.48501 * 110.00068 * 180.02562 * 23 21 20 44 44 H 1.48500 * 110.00022 * 301.32161 * 23 21 20 45 45 H 1.08000 * 119.94218 * 179.97438 * 24 20 19 46 46 H 1.08001 * 119.97409 * 179.97438 * 25 24 20 47 47 H 1.08000 * 120.02626 * 180.32113 * 26 25 24 48 48 H 1.07998 * 119.85721 * 179.76663 * 27 15 14 49 49 H 1.08004 * 119.92571 * 179.97438 * 28 27 15 50 50 H 1.08005 * 120.07059 * 179.97438 * 29 28 27 51 51 H 1.08995 * 113.61442 * 334.56320 * 30 5 3 52 52 H 1.08996 * 113.61596 * 105.46908 * 30 5 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 1.4520 0.0000 0.0000 3 6 2.0614 1.1960 0.0000 4 8 1.4034 2.2093 0.0005 5 6 3.5663 1.2749 0.0063 6 1 4.0269 0.6347 -0.7462 7 6 4.1077 2.7143 0.0061 8 6 5.1768 2.2285 0.9991 9 1 6.0787 1.8491 0.5187 10 7 5.4627 3.1874 2.0691 11 6 6.6583 3.1668 2.6909 12 8 7.4993 2.3522 2.3641 13 6 6.9470 4.1349 3.7704 14 6 8.1819 4.1123 4.4202 15 6 8.4464 5.0211 5.4242 16 6 9.7809 5.0014 6.1238 17 8 9.7142 4.1275 7.2524 18 6 10.8430 3.9948 7.9975 19 6 10.8492 3.1622 9.1069 20 6 11.9983 3.0287 9.8625 21 6 12.0059 2.1238 11.0677 22 8 11.0254 2.5717 12.0059 23 14 13.6898 2.1637 11.8635 24 6 13.1409 3.7243 9.5139 25 6 13.1370 4.5558 8.4090 26 6 11.9926 4.6882 7.6470 27 6 7.4873 5.9472 5.7933 28 6 6.2590 5.9717 5.1563 29 6 5.9833 5.0713 4.1485 30 6 4.1851 1.1266 1.4063 31 1 -0.3633 0.5138 0.8900 32 1 -0.3633 0.5139 -0.8900 33 1 -0.3633 -1.0277 -0.0005 34 1 4.5149 3.0274 -0.9553 35 1 3.4155 3.4412 0.4307 36 1 4.7915 3.8374 2.3301 37 1 8.9301 3.3875 4.1355 38 1 10.5473 4.6468 5.4345 39 1 10.0308 6.0083 6.4581 40 1 9.9567 2.6189 9.3799 41 1 11.7739 1.1048 10.7583 42 1 11.1693 3.4732 12.3249 43 1 13.7107 1.2749 13.0529 44 1 14.7228 1.7309 10.8884 45 1 14.0380 3.6189 10.1061 46 1 14.0308 5.0986 8.1390 47 1 11.9915 5.3337 6.7811 48 1 7.6978 6.6539 6.5823 49 1 5.5144 6.6970 5.4495 50 1 5.0241 5.0913 3.6524 51 1 3.5140 1.4197 2.2136 52 1 4.6547 0.1576 1.5757 There are 73 doubly filled levels RHF calculation, no. of doubly occupied orbitals= 73 No. of singly occupied orbitals= 1 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=0 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 s_22_10970304_4549630.mol2 52 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Sat Mar 6 2021 15:36:20 Heat of formation + Delta-G solvation = -100.896463 kcal Electronic energy + Delta-G solvation = -34960.027146 eV Core-core repulsion = 30050.744619 eV Total energy + Delta-G solvation = -4909.282527 eV No. of doubly occupied orbitals = 73 and no. of open levels = 1 Molecular weight (most abundant/longest-lived isotopes) = 398.165 amu Computer time = 1.47 seconds Orbital eigenvalues (eV) -42.03401 -41.47541 -41.08919 -40.04318 -39.15935 -38.67298 -37.33384 -37.22214 -34.86400 -33.36600 -32.44063 -32.24361 -31.03250 -29.43140 -27.84886 -27.09854 -26.96697 -26.59407 -24.96866 -23.64533 -23.20802 -22.51954 -22.09908 -21.43368 -20.69207 -19.20064 -19.05474 -18.74002 -17.99874 -17.79534 -17.42360 -17.36566 -17.21815 -17.15894 -16.91482 -16.55217 -16.37736 -16.10716 -15.93050 -15.77235 -15.49248 -15.22503 -14.91998 -14.84400 -14.55953 -14.43585 -14.28783 -14.13949 -13.97179 -13.76611 -13.64693 -13.48606 -13.42949 -13.06442 -12.93083 -12.86337 -12.63038 -12.55473 -12.38604 -12.22563 -12.01011 -11.91047 -11.89768 -11.81146 -11.62728 -11.39582 -10.97731 -10.49473 -10.26133 -10.10599 -10.02268 -9.89321 -9.22550 -5.02320 -0.31450 0.10164 0.22744 0.42933 1.12004 1.29078 1.60010 1.64739 1.67754 1.97469 2.07444 2.25773 2.69596 2.82323 3.12735 3.20782 3.41229 3.48699 3.51404 3.56445 3.64178 3.65081 3.66926 3.80642 3.91279 3.93754 3.98069 4.00058 4.10048 4.13918 4.17890 4.21359 4.21575 4.33622 4.41080 4.42259 4.43753 4.50247 4.55834 4.57010 4.61456 4.64266 4.69177 4.76615 4.81017 4.96753 4.98973 5.11060 5.18897 5.27506 5.31007 5.33639 5.38393 5.38934 5.45694 5.67725 5.69753 6.36020 6.38772 6.57925 6.69832 7.10800 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.034 3.966 2 O -0.356 6.356 3 C 0.472 3.528 4 O -0.505 6.505 5 C -0.109 4.109 6 H 0.132 0.868 7 C -0.127 4.127 8 C 0.126 3.874 9 H 0.126 0.874 10 N -0.716 5.716 11 C 0.563 3.437 12 O -0.531 6.531 13 C -0.140 4.140 14 C -0.033 4.033 15 C -0.105 4.105 16 C 0.102 3.898 17 O -0.307 6.307 18 C 0.131 3.869 19 C -0.125 4.125 20 C -0.081 4.081 21 C -0.070 4.070 22 O -0.539 6.539 23 Si 0.693 3.307 24 C -0.156 4.156 25 C -0.073 4.073 26 C -0.205 4.205 27 C -0.066 4.066 28 C -0.128 4.128 29 C -0.075 4.075 30 C -0.134 4.134 31 H 0.064 0.936 32 H 0.064 0.936 33 H 0.104 0.896 34 H 0.090 0.910 35 H 0.103 0.897 36 H 0.402 0.598 37 H 0.139 0.861 38 H 0.075 0.925 39 H 0.076 0.924 40 H 0.134 0.866 41 H 0.115 0.885 42 H 0.379 0.621 43 H -0.255 1.255 44 H -0.258 1.258 45 H 0.128 0.872 46 H 0.130 0.870 47 H 0.130 0.870 48 H 0.132 0.868 49 H 0.135 0.865 50 H 0.129 0.871 51 H 0.092 0.908 52 H 0.091 0.909 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -0.200 4.554 -0.041 4.558 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 -0.060 4.060 2 O -0.273 6.273 3 C 0.315 3.685 4 O -0.393 6.393 5 C -0.129 4.129 6 H 0.150 0.850 7 C -0.165 4.165 8 C 0.021 3.979 9 H 0.144 0.856 10 N -0.367 5.367 11 C 0.351 3.649 12 O -0.408 6.408 13 C -0.143 4.143 14 C -0.052 4.052 15 C -0.105 4.105 16 C 0.027 3.973 17 O -0.221 6.221 18 C 0.086 3.914 19 C -0.144 4.144 20 C -0.081 4.081 21 C -0.181 4.181 22 O -0.344 6.344 23 Si 0.595 3.405 24 C -0.174 4.174 25 C -0.091 4.091 26 C -0.224 4.224 27 C -0.084 4.084 28 C -0.145 4.145 29 C -0.093 4.093 30 C -0.173 4.173 31 H 0.082 0.918 32 H 0.083 0.917 33 H 0.122 0.878 34 H 0.108 0.892 35 H 0.121 0.879 36 H 0.239 0.761 37 H 0.157 0.843 38 H 0.094 0.906 39 H 0.094 0.906 40 H 0.152 0.848 41 H 0.133 0.867 42 H 0.227 0.773 43 H -0.180 1.180 44 H -0.183 1.183 45 H 0.146 0.854 46 H 0.148 0.852 47 H 0.148 0.852 48 H 0.150 0.850 49 H 0.153 0.847 50 H 0.146 0.854 51 H 0.110 0.890 52 H 0.109 0.891 Dipole moment (debyes) X Y Z Total from point charges 0.451 3.099 -0.140 3.135 hybrid contribution -1.018 0.246 -0.593 1.203 sum -0.567 3.345 -0.733 3.471 Atomic orbital electron populations 1.23330 0.75886 1.04064 1.02703 1.86524 1.23760 1.33244 1.83736 1.23467 0.91565 0.81442 0.72039 1.90680 1.66988 1.36433 1.45154 1.22309 0.87762 1.00984 1.01798 0.84974 1.23386 0.97147 0.94977 1.00965 1.22459 0.97976 0.89504 0.87995 0.85597 1.45845 1.16462 1.36876 1.37567 1.18280 0.81758 0.83396 0.81489 1.90804 1.46300 1.38776 1.64913 1.19864 0.96133 0.98895 0.99454 1.21182 0.95686 0.95685 0.92630 1.19418 0.95724 0.97728 0.97618 1.21594 0.94985 0.94167 0.86553 1.86170 1.33074 1.63474 1.39420 1.19015 0.85560 0.95230 0.91591 1.20257 0.99374 1.00653 0.94069 1.20144 0.93334 0.97719 0.96913 1.25122 1.04578 0.98876 0.89516 1.86516 1.51629 1.35862 1.60383 0.94638 0.74883 0.89948 0.80992 1.20928 0.97660 0.99583 0.99211 1.20915 0.97566 0.96784 0.93801 1.21325 0.93579 1.04349 1.03139 1.21340 0.92502 0.96991 0.97560 1.21141 0.97293 0.99545 0.96565 1.21382 0.98149 0.93626 0.96173 1.23454 0.97992 1.01284 0.94572 0.91763 0.91702 0.87806 0.89160 0.87874 0.76136 0.84308 0.90642 0.90565 0.84834 0.86728 0.77339 1.17984 1.18273 0.85436 0.85168 0.85198 0.85022 0.84698 0.85352 0.88986 0.89051 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 0.03 -0.02 10.56 101.05 1.07 1.04 16 2 O -0.36 -0.46 10.57 -39.27 -0.41 -0.87 16 3 C 0.47 0.66 7.48 36.01 0.27 0.93 16 4 O -0.51 -2.01 15.65 -18.75 -0.29 -2.30 16 5 C -0.11 0.15 4.26 -90.96 -0.39 -0.24 16 6 H 0.13 -0.41 8.14 -51.93 -0.42 -0.83 16 7 C -0.13 0.24 7.16 -25.92 -0.19 0.05 16 8 C 0.13 -0.14 4.24 -67.14 -0.28 -0.42 16 9 H 0.13 -0.03 7.46 -51.93 -0.39 -0.42 16 10 N -0.72 0.55 5.31 -53.98 -0.29 0.27 16 11 C 0.56 1.19 7.77 -12.33 -0.10 1.09 16 12 O -0.53 -3.01 15.95 5.31 0.08 -2.93 16 13 C -0.14 -0.14 5.87 -104.97 -0.62 -0.75 16 14 C -0.03 -0.05 9.25 -39.18 -0.36 -0.41 16 15 C -0.10 -0.03 5.50 -104.68 -0.58 -0.61 16 16 C 0.10 -0.04 4.86 36.00 0.17 0.14 16 17 O -0.31 -0.70 10.12 -19.43 -0.20 -0.90 16 18 C 0.13 0.26 6.69 -39.22 -0.26 0.00 16 19 C -0.12 -0.28 9.55 -39.43 -0.38 -0.65 16 20 C -0.08 -0.07 5.39 -104.64 -0.56 -0.64 16 21 C -0.07 -0.03 2.82 36.01 0.10 0.08 16 22 O -0.54 -0.42 12.77 -35.23 -0.45 -0.87 16 23 Si 0.69 -0.55 29.78 -169.99 -5.06 -5.62 16 24 C -0.16 0.01 8.67 -39.56 -0.34 -0.33 16 25 C -0.07 0.02 10.04 -39.61 -0.40 -0.37 16 26 C -0.21 -0.07 9.04 -39.43 -0.36 -0.42 16 27 C -0.07 0.06 9.69 -39.49 -0.38 -0.32 16 28 C -0.13 0.20 10.03 -39.64 -0.40 -0.19 16 29 C -0.07 0.10 9.54 -39.19 -0.37 -0.28 16 30 C -0.13 0.18 7.43 -25.94 -0.19 -0.01 16 31 H 0.06 -0.04 8.13 -51.93 -0.42 -0.47 16 32 H 0.06 -0.04 8.13 -51.93 -0.42 -0.47 16 33 H 0.10 -0.31 8.14 -51.93 -0.42 -0.73 16 34 H 0.09 -0.24 8.14 -51.93 -0.42 -0.66 16 35 H 0.10 -0.14 7.41 -51.93 -0.38 -0.52 16 36 H 0.40 -1.23 6.76 -40.82 -0.28 -1.50 16 37 H 0.14 0.28 7.65 -52.49 -0.40 -0.12 16 38 H 0.08 -0.09 7.59 -51.93 -0.39 -0.49 16 39 H 0.08 -0.17 7.61 -51.93 -0.40 -0.56 16 40 H 0.13 0.35 8.06 -52.49 -0.42 -0.07 16 41 H 0.12 0.10 7.96 -51.93 -0.41 -0.31 16 42 H 0.38 -1.21 8.70 45.56 0.40 -0.81 16 43 H -0.25 -0.61 7.11 56.52 0.40 -0.21 16 44 H -0.26 -0.38 7.11 56.52 0.40 0.02 16 45 H 0.13 -0.25 4.87 -52.49 -0.26 -0.50 16 46 H 0.13 -0.33 8.06 -52.49 -0.42 -0.75 16 47 H 0.13 -0.21 6.30 -52.49 -0.33 -0.54 16 48 H 0.13 -0.35 8.06 -52.49 -0.42 -0.77 16 49 H 0.14 -0.50 8.06 -52.48 -0.42 -0.93 16 50 H 0.13 -0.51 6.41 -52.48 -0.34 -0.84 16 51 H 0.09 -0.10 8.09 -51.93 -0.42 -0.52 16 52 H 0.09 -0.13 8.14 -51.93 -0.42 -0.55 16 LS Contribution 438.08 15.07 6.60 6.60 Total: 0.00 -10.92 438.08 -11.58 -22.50 By element: Atomic # 1 Polarization: -6.53 SS G_CDS: -7.02 Total: -13.56 kcal Atomic # 6 Polarization: 2.22 SS G_CDS: -4.54 Total: -2.33 kcal Atomic # 7 Polarization: 0.55 SS G_CDS: -0.29 Total: 0.27 kcal Atomic # 8 Polarization: -6.60 SS G_CDS: -1.27 Total: -7.87 kcal Atomic # 14 Polarization: -0.55 SS G_CDS: -5.06 Total: -5.62 kcal Total LS contribution 6.60 Total: 6.60 kcal Total: -10.92 -11.58 -22.50 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. s_22_10970304_4549630.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 -78.397 kcal (2) G-P(sol) polarization free energy of solvation -10.915 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -89.312 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -11.585 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -22.500 kcal (6) G-S(sol) free energy of system = (1) + (5) -100.896 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.47 seconds