Wall clock time and date at job start Thu Mar 4 2021 15:50:06 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 O 2 2 C 1.42897 * 1 3 3 Si 1.86300 * 109.47568 * 2 1 4 4 C 1.50705 * 109.47109 * 240.00006 * 2 1 3 5 5 C 1.35009 * 126.42619 * 150.00504 * 4 2 1 6 6 N 1.33594 * 108.64834 * 179.46884 * 5 4 2 7 7 C 1.32420 * 109.22213 * 0.61627 * 6 5 4 8 8 C 1.41252 * 132.11199 * 179.29726 * 7 6 5 9 9 Br 1.89099 * 120.25784 * 359.97438 * 8 7 6 10 10 C 1.35698 * 119.48561 * 180.02562 * 8 7 6 11 11 C 1.41769 * 119.53568 * 359.97438 * 10 8 7 12 12 C 1.47572 * 120.00974 * 180.02562 * 11 10 8 13 13 O 1.21597 * 119.99646 * 179.97438 * 12 11 10 14 14 N 1.34771 * 120.00452 * 359.97438 * 12 11 10 15 15 C 1.46493 * 120.00418 * 180.02562 * 14 12 11 16 16 H 1.09003 * 109.47430 * 34.99863 * 15 14 12 17 17 C 1.52998 * 109.47614 * 154.99764 * 15 14 12 18 18 C 1.52995 * 109.47392 * 179.97438 * 17 15 14 19 19 C 1.53000 * 109.47712 * 300.00254 * 18 17 15 20 20 H 1.09003 * 109.46787 * 300.00374 * 19 18 17 21 21 C 1.50698 * 109.47548 * 179.97438 * 19 18 17 22 22 N 1.30639 * 119.25220 * 334.72355 * 21 19 18 23 23 C 1.33519 * 121.50336 * 179.76183 * 22 21 19 24 24 C 1.36198 * 119.90957 * 0.51046 * 23 22 21 25 25 C 1.41023 * 118.59365 * 359.75915 * 24 23 22 26 26 O 1.21980 * 120.70734 * 179.97438 * 25 24 23 27 27 N 1.34743 * 119.25209 * 155.00375 * 21 19 18 28 28 C 1.52998 * 109.46899 * 59.99444 * 19 18 17 29 29 C 1.52997 * 109.47048 * 275.00134 * 15 14 12 30 30 C 1.36500 * 119.97677 * 0.02562 * 11 10 8 31 31 N 1.35942 * 120.50680 * 0.27628 * 30 11 10 32 32 H 0.96698 * 113.99948 * 59.99609 * 1 2 3 33 33 H 1.09002 * 109.47297 * 119.99829 * 2 1 3 34 34 H 1.48499 * 109.99777 * 298.68432 * 3 2 1 35 35 H 1.48503 * 109.99865 * 59.99912 * 3 2 1 36 36 H 1.07992 * 125.67831 * 0.03136 * 5 4 2 37 37 H 1.08000 * 120.23767 * 179.97438 * 10 8 7 38 38 H 0.97005 * 119.99996 * 359.97438 * 14 12 11 39 39 H 1.08995 * 109.47387 * 300.00300 * 17 15 14 40 40 H 1.09003 * 109.47018 * 60.00001 * 17 15 14 41 41 H 1.09003 * 109.47300 * 60.00314 * 18 17 15 42 42 H 1.09003 * 109.47086 * 179.97438 * 18 17 15 43 43 H 1.07999 * 120.04668 * 180.27212 * 23 22 21 44 44 H 1.08004 * 120.70567 * 179.73220 * 24 23 22 45 45 H 0.96999 * 120.04821 * 359.97438 * 27 21 19 46 46 H 1.09003 * 109.47018 * 60.00455 * 28 19 18 47 47 H 1.08995 * 109.47387 * 180.02562 * 28 19 18 48 48 H 1.09003 * 109.46911 * 299.99587 * 29 15 14 49 49 H 1.08996 * 109.47750 * 59.99866 * 29 15 14 50 50 H 1.08002 * 119.74245 * 179.97438 * 30 11 10 Note: An asterisk (*) indicates this parameter was or will be optimized. Cartesian coordinates (angstroms) NO. Atom X Y Z 1 8 0.0000 0.0000 0.0000 2 6 1.4290 0.0000 0.0000 3 14 2.0501 1.7564 0.0000 4 6 1.9313 -0.7104 -1.2305 5 6 3.0856 -0.4612 -1.8850 6 7 3.1821 -1.3042 -2.9169 7 6 2.1095 -2.0802 -2.9477 8 6 1.7125 -3.1128 -3.8259 9 35 2.8125 -3.5980 -5.2855 10 6 0.5349 -3.7533 -3.6147 11 6 -0.2781 -3.3768 -2.5160 12 6 -1.5604 -4.0667 -2.2762 13 8 -2.2574 -3.7439 -1.3335 14 7 -1.9590 -5.0545 -3.1018 15 6 -3.2322 -5.7389 -2.8641 16 1 -3.9588 -5.0283 -2.4701 17 6 -3.7512 -6.3223 -4.1798 18 6 -5.0806 -7.0377 -3.9313 19 6 -4.8711 -8.1668 -2.9203 20 1 -4.1444 -8.8772 -3.3144 21 6 -6.1807 -8.8710 -2.6751 22 7 -7.2993 -8.2250 -2.8702 23 6 -8.4846 -8.8064 -2.6713 24 6 -8.5443 -10.0988 -2.2456 25 6 -7.3368 -10.7946 -2.0297 26 8 -7.3452 -11.9532 -1.6481 27 7 -6.1713 -10.1510 -2.2541 28 6 -4.3521 -7.5834 -1.6046 29 6 -3.0232 -6.8679 -1.8529 30 6 0.1255 -2.3760 -1.6802 31 7 1.3022 -1.7300 -1.8950 32 1 -0.3933 0.4417 -0.7650 33 1 1.7923 -0.5138 0.8900 34 1 1.5880 2.4585 -1.2242 35 1 1.5616 2.4679 1.2085 36 1 3.8143 0.2882 -1.6137 37 1 0.2193 -4.5443 -4.2788 38 1 -1.4032 -5.3118 -3.8541 39 1 -3.9001 -5.5181 -4.9002 40 1 -3.0247 -7.0330 -4.5738 41 1 -5.8074 -6.3274 -3.5371 42 1 -5.4506 -7.4529 -4.8688 43 1 -9.3949 -8.2515 -2.8441 44 1 -9.4961 -10.5804 -2.0766 45 1 -5.3283 -10.6095 -2.1123 46 1 -5.0788 -6.8730 -1.2104 47 1 -4.2024 -8.3878 -0.8844 48 1 -2.2967 -7.5786 -2.2468 49 1 -2.6535 -6.4524 -0.9155 50 1 -0.4970 -2.0920 -0.8446 There are 75 doubly filled levels RHF calculation, no. of doubly occupied orbitals= 75 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). Br: (AM1): M.J.S. DEWAR AND E. G. ZOEBISCH, THEOCHEM, 180, 1 (1988). 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 m_22_13456076_12335884.mol2 50 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Thu Mar 4 2021 15:50:06 Heat of formation + Delta-G solvation = 35.581736 kcal Electronic energy + Delta-G solvation = -38275.554639 eV Core-core repulsion = 33124.269229 eV Total energy + Delta-G solvation = -5151.285410 eV No. of doubly occupied orbitals = 75 and no. of open levels = 1 Molecular weight (most abundant/longest-lived isotopes) = 474.074 amu Computer time = 1.57 seconds Orbital eigenvalues (eV) -44.27696 -42.90033 -41.46433 -39.87674 -38.69374 -38.40903 -38.05916 -36.06536 -35.44431 -35.10698 -33.05683 -32.29024 -32.09572 -31.81359 -30.37149 -30.11270 -26.99399 -26.38596 -25.57955 -24.97313 -24.14107 -23.99429 -22.94678 -22.53393 -21.80198 -21.17347 -19.79846 -19.59025 -19.17256 -18.80152 -18.31650 -17.91139 -17.82008 -17.56844 -17.17998 -17.03239 -16.47572 -16.35649 -16.14661 -15.98648 -15.88100 -15.65905 -15.60263 -15.40811 -15.27766 -14.98471 -14.73186 -14.48824 -14.23179 -14.15749 -14.08578 -13.67204 -13.52403 -13.47301 -13.35087 -13.00309 -12.83463 -12.73730 -12.57564 -12.42086 -12.18634 -12.09517 -11.87806 -11.59316 -11.53098 -11.39842 -11.33236 -11.25736 -11.18470 -11.15085 -11.13448 -10.35991 -10.05270 -9.59556 -9.11334 -5.14310 -0.92217 -0.50337 -0.42842 0.17106 0.75454 0.84919 1.09938 1.32050 1.50455 1.52630 1.77394 1.80270 1.89902 2.21433 2.51568 2.62556 2.74264 2.85260 3.05458 3.20323 3.29011 3.33455 3.38412 3.40872 3.44937 3.56705 3.67980 3.80865 3.88250 3.92244 4.03522 4.03972 4.09859 4.17285 4.19116 4.21160 4.23751 4.33604 4.37536 4.42238 4.47498 4.51719 4.71634 4.77690 4.81078 4.86048 4.91017 4.92501 5.00953 5.11647 5.23456 5.24619 5.38342 5.40229 5.54942 5.99740 6.15491 6.48981 6.66030 6.76834 6.88225 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 O -0.531 6.531 2 C -0.045 4.045 3 Si 0.718 3.282 4 C -0.086 4.086 5 C 0.052 3.948 6 N -0.460 5.460 7 C 0.242 3.758 8 C -0.062 4.062 9 Br 0.009 6.991 10 C -0.043 4.043 11 C -0.173 4.173 12 C 0.577 3.423 13 O -0.526 6.526 14 N -0.719 5.719 15 C 0.144 3.856 16 H 0.097 0.903 17 C -0.129 4.129 18 C -0.095 4.095 19 C -0.047 4.047 20 H 0.102 0.898 21 C 0.403 3.597 22 N -0.533 5.533 23 C 0.156 3.844 24 C -0.292 4.292 25 C 0.519 3.481 26 O -0.537 6.537 27 N -0.627 5.627 28 C -0.109 4.109 29 C -0.128 4.128 30 C 0.163 3.837 31 N -0.355 5.355 32 H 0.379 0.621 33 H 0.128 0.872 34 H -0.254 1.254 35 H -0.248 1.248 36 H 0.197 0.803 37 H 0.154 0.846 38 H 0.401 0.599 39 H 0.080 0.920 40 H 0.072 0.928 41 H 0.090 0.910 42 H 0.077 0.923 43 H 0.171 0.829 44 H 0.157 0.843 45 H 0.418 0.582 46 H 0.081 0.919 47 H 0.072 0.928 48 H 0.071 0.929 49 H 0.077 0.923 50 H 0.193 0.807 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 2.639 2.879 -2.439 4.605 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 O -0.337 6.337 2 C -0.154 4.154 3 Si 0.615 3.385 4 C -0.197 4.197 5 C -0.098 4.098 6 N -0.179 5.179 7 C -0.003 4.003 8 C -0.144 4.144 9 Br 0.095 6.905 10 C -0.069 4.069 11 C -0.181 4.181 12 C 0.363 3.637 13 O -0.402 6.402 14 N -0.370 5.370 15 C 0.040 3.960 16 H 0.115 0.885 17 C -0.167 4.167 18 C -0.134 4.134 19 C -0.067 4.067 20 H 0.120 0.880 21 C 0.138 3.862 22 N -0.256 5.256 23 C 0.018 3.982 24 C -0.317 4.317 25 C 0.318 3.682 26 O -0.414 6.414 27 N -0.266 5.266 28 C -0.148 4.148 29 C -0.167 4.167 30 C 0.036 3.964 31 N -0.028 5.028 32 H 0.227 0.773 33 H 0.145 0.855 34 H -0.178 1.178 35 H -0.172 1.172 36 H 0.214 0.786 37 H 0.172 0.828 38 H 0.237 0.763 39 H 0.098 0.902 40 H 0.091 0.909 41 H 0.109 0.891 42 H 0.095 0.905 43 H 0.188 0.812 44 H 0.175 0.825 45 H 0.256 0.744 46 H 0.099 0.901 47 H 0.090 0.910 48 H 0.089 0.911 49 H 0.096 0.904 50 H 0.210 0.790 Dipole moment (debyes) X Y Z Total from point charges 2.722 3.569 -2.275 5.033 hybrid contribution -1.423 -1.431 0.298 2.040 sum 1.299 2.138 -1.978 3.189 Atomic orbital electron populations 1.86613 1.17570 1.79735 1.49802 1.24872 0.83865 1.11265 0.95376 0.94591 0.90943 0.71768 0.81184 1.22087 0.98523 0.96796 1.02329 1.22441 0.95776 0.99730 0.91900 1.70875 1.19055 1.06893 1.21029 1.20451 0.89502 0.99400 0.90932 1.20462 0.97585 0.98783 0.97595 1.96867 1.66358 1.90597 1.36719 1.21078 0.91446 0.98296 0.96081 1.19273 0.98439 1.01433 0.98922 1.17488 0.84240 0.79489 0.82459 1.90869 1.54855 1.64972 1.29539 1.45885 1.23325 1.36624 1.31158 1.21120 0.84918 0.94156 0.95817 0.88491 1.21869 0.97658 1.00761 0.96435 1.21365 0.97106 0.96494 0.98429 1.20560 0.89295 0.98081 0.98757 0.88033 1.23182 0.96809 0.80715 0.85535 1.68289 0.96821 1.35472 1.25024 1.22759 0.95639 0.91949 0.87875 1.22982 0.99138 0.97383 1.12195 1.17361 0.84021 0.87422 0.79402 1.91032 1.86373 1.16351 1.47672 1.44769 1.12783 1.13280 1.55721 1.21555 0.97722 1.00702 0.94796 1.21909 0.96982 0.97368 1.00404 1.22166 0.85265 0.90175 0.98782 1.42637 1.14944 1.23914 1.21328 0.77310 0.85453 1.17847 1.17227 0.78636 0.82825 0.76306 0.90175 0.90913 0.89136 0.90474 0.81227 0.82506 0.74372 0.90072 0.90978 0.91076 0.90392 0.78979 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 O -0.53 0.38 10.90 -35.23 -0.38 0.00 16 2 C -0.04 0.09 3.06 36.01 0.11 0.20 16 3 Si 0.72 -2.12 31.18 -169.99 -5.30 -7.42 16 4 C -0.09 0.03 6.24 -81.43 -0.51 -0.48 16 5 C 0.05 0.00 10.44 -17.93 -0.19 -0.19 16 6 N -0.46 -1.29 11.30 -12.70 -0.14 -1.44 16 7 C 0.24 0.51 7.59 -155.91 -1.18 -0.67 16 8 C -0.06 -0.03 6.24 -39.35 -0.25 -0.27 16 9 Br 0.01 0.00 33.72 -68.01 -2.29 -2.29 16 10 C -0.04 0.08 9.26 -39.14 -0.36 -0.28 16 11 C -0.17 0.16 5.84 -105.37 -0.61 -0.45 16 12 C 0.58 -0.34 7.73 -12.46 -0.10 -0.44 16 13 O -0.53 -1.50 15.94 5.28 0.08 -1.42 16 14 N -0.72 2.58 5.03 -54.84 -0.28 2.30 16 15 C 0.14 -0.53 2.45 -67.94 -0.17 -0.70 16 16 H 0.10 -0.16 7.58 -51.93 -0.39 -0.56 16 17 C -0.13 0.70 5.39 -26.73 -0.14 0.56 16 18 C -0.10 0.43 4.67 -26.73 -0.12 0.31 16 19 C -0.05 0.22 2.48 -91.77 -0.23 -0.01 16 20 H 0.10 -0.66 8.14 -51.93 -0.42 -1.08 16 21 C 0.40 -0.81 6.73 -155.57 -1.05 -1.86 16 22 N -0.53 0.40 9.12 -10.64 -0.10 0.31 16 23 C 0.16 -0.13 11.20 -17.55 -0.20 -0.33 16 24 C -0.29 -0.26 10.07 -39.26 -0.40 -0.65 16 25 C 0.52 1.44 7.75 -15.09 -0.12 1.33 16 26 O -0.54 -3.78 17.97 4.94 0.09 -3.69 16 27 N -0.63 0.62 5.25 -12.27 -0.06 0.56 16 28 C -0.11 0.44 5.18 -26.75 -0.14 0.31 16 29 C -0.13 0.49 5.49 -26.75 -0.15 0.34 16 30 C 0.16 0.01 9.91 -16.36 -0.16 -0.15 16 31 N -0.36 -0.30 2.93 -58.09 -0.17 -0.47 16 32 H 0.38 -1.12 8.70 45.56 0.40 -0.73 16 33 H 0.13 -0.37 7.96 -51.93 -0.41 -0.78 16 34 H -0.25 0.06 7.11 56.52 0.40 0.47 16 35 H -0.25 -0.04 7.11 56.52 0.40 0.37 16 36 H 0.20 -0.77 6.90 -52.49 -0.36 -1.13 16 37 H 0.15 -0.80 6.44 -52.49 -0.34 -1.13 16 38 H 0.40 -2.42 6.64 -40.82 -0.27 -2.69 16 39 H 0.08 -0.42 8.14 -51.93 -0.42 -0.85 16 40 H 0.07 -0.48 8.14 -51.93 -0.42 -0.90 16 41 H 0.09 -0.29 7.75 -51.93 -0.40 -0.70 16 42 H 0.08 -0.33 8.14 -51.93 -0.42 -0.75 16 43 H 0.17 -0.60 8.06 -52.49 -0.42 -1.02 16 44 H 0.16 0.00 8.06 -52.48 -0.42 -0.42 16 45 H 0.42 -1.33 8.78 -40.82 -0.36 -1.69 16 46 H 0.08 -0.22 8.14 -51.93 -0.42 -0.65 16 47 H 0.07 -0.31 8.14 -51.93 -0.42 -0.73 16 48 H 0.07 -0.35 8.14 -51.93 -0.42 -0.77 16 49 H 0.08 -0.13 8.14 -51.93 -0.42 -0.55 16 50 H 0.19 0.02 6.19 -52.49 -0.32 -0.30 16 LS Contribution 433.48 15.07 6.53 6.53 Total: 0.00 -13.22 433.48 -13.87 -27.09 By element: Atomic # 1 Polarization: -10.71 SS G_CDS: -5.89 Total: -16.60 kcal Atomic # 6 Polarization: 2.50 SS G_CDS: -5.95 Total: -3.46 kcal Atomic # 7 Polarization: 2.01 SS G_CDS: -0.75 Total: 1.26 kcal Atomic # 8 Polarization: -4.89 SS G_CDS: -0.21 Total: -5.10 kcal Atomic # 14 Polarization: -2.12 SS G_CDS: -5.30 Total: -7.42 kcal Atomic # 35 Polarization: 0.00 SS G_CDS: -2.29 Total: -2.29 kcal Total LS contribution 6.53 Total: 6.53 kcal Total: -13.22 -13.87 -27.09 kcal The number of atoms in the molecule is 50 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. m_22_13456076_12335884.mol2 50 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 62.670 kcal (2) G-P(sol) polarization free energy of solvation -13.217 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 49.453 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -13.871 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -27.089 kcal (6) G-S(sol) free energy of system = (1) + (5) 35.582 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.57 seconds