Wall clock time and date at job start Wed Apr 1 2020 02:08:29 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 1.50706 * 1 3 3 C 1.38255 * 119.99948 * 2 1 4 4 C 1.38220 * 119.99929 * 179.97438 * 3 2 1 5 5 C 1.38261 * 119.99607 * 0.02562 * 4 3 2 6 6 C 1.38208 * 120.00210 * 359.70524 * 5 4 3 7 7 C 1.38212 * 119.99780 * 179.97438 * 2 1 3 8 8 C 1.50697 * 120.00322 * 359.97438 * 7 2 1 9 9 C 1.50701 * 109.47094 * 85.00077 * 8 7 2 10 10 O 1.21285 * 119.99881 * 0.02562 * 9 8 7 11 11 N 1.34774 * 120.00216 * 180.02562 * 9 8 7 12 12 C 1.46503 * 120.00149 * 180.02562 * 11 9 8 13 13 H 1.08999 * 109.79120 * 35.48996 * 12 11 9 14 14 C 1.53306 * 109.62898 * 274.99958 * 12 11 9 15 15 C 1.52838 * 108.21287 * 176.50010 * 14 12 11 16 16 C 1.50894 * 111.56768 * 59.05827 * 15 14 12 17 17 H 1.09000 * 108.32179 * 186.69185 * 16 15 14 18 18 C 1.53378 * 113.07558 * 65.83024 * 16 15 14 19 19 N 1.47426 * 106.51557 * 212.47150 * 18 16 15 20 20 C 1.36932 * 125.72843 * 179.30970 * 19 18 16 21 21 H 1.08003 * 120.00279 * 180.02562 * 20 19 18 22 22 C 1.38817 * 120.00156 * 0.02562 * 20 19 18 23 23 N 1.31624 * 119.99272 * 0.02562 * 22 20 19 24 24 Si 1.86790 * 120.00151 * 180.02562 * 22 20 19 25 25 H 1.48498 * 109.47459 * 90.00008 * 24 22 20 26 26 H 1.48510 * 109.47030 * 210.00201 * 24 22 20 27 27 H 1.48495 * 109.47286 * 329.99736 * 24 22 20 28 28 C 1.47620 * 108.54648 * 359.32961 * 19 18 16 29 29 C 1.54063 * 113.56503 * 307.87153 * 16 15 14 30 30 H 1.09002 * 112.60889 * 281.00297 * 29 16 15 31 31 C 1.51227 * 109.82378 * 155.53227 * 12 11 9 32 32 H 1.09002 * 109.46605 * 270.02064 * 1 2 3 33 33 H 1.08997 * 109.46736 * 30.01770 * 1 2 3 34 34 H 1.08998 * 109.47293 * 150.02390 * 1 2 3 35 35 H 1.08001 * 119.99992 * 0.02562 * 3 2 1 36 36 H 1.07993 * 119.99598 * 180.02562 * 4 3 2 37 37 H 1.08003 * 119.99289 * 179.97438 * 5 4 3 38 38 H 1.07997 * 119.99825 * 180.29849 * 6 5 4 39 39 H 1.09004 * 109.47380 * 325.00870 * 8 7 2 40 40 H 1.09000 * 109.47641 * 205.00425 * 8 7 2 41 41 H 0.96999 * 120.00317 * 0.02562 * 11 9 8 42 42 H 1.08998 * 109.71296 * 56.82476 * 14 12 11 43 43 H 1.09001 * 109.75120 * 296.19937 * 14 12 11 44 44 H 1.08994 * 109.06482 * 298.51970 * 15 14 12 45 45 H 1.09002 * 109.00352 * 179.55593 * 15 14 12 46 46 H 1.09003 * 110.04597 * 331.73169 * 18 16 15 47 47 H 1.08989 * 110.05117 * 93.15403 * 18 16 15 48 48 H 0.97000 * 119.99186 * 179.97438 * 23 22 20 49 49 H 1.08995 * 110.44039 * 266.12144 * 28 19 18 50 50 H 1.09007 * 110.43808 * 143.61531 * 28 19 18 51 51 H 1.09001 * 108.73135 * 60.89927 * 31 12 11 52 52 H 1.08991 * 108.86836 * 302.09659 * 31 12 11 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 1.5071 0.0000 0.0000 3 6 2.1983 1.1973 0.0000 4 6 3.5805 1.1973 0.0005 5 6 4.2717 -0.0001 0.0005 6 6 3.5807 -1.1970 0.0062 7 6 2.1981 -1.1970 0.0005 8 6 1.4446 -2.5021 0.0017 9 6 1.0857 -2.8761 -1.4133 10 8 1.4102 -2.1542 -2.3323 11 7 0.4040 -4.0128 -1.6576 12 6 0.0556 -4.3768 -3.0333 13 1 0.8544 -4.0718 -3.7093 14 6 -1.2513 -3.6830 -3.4343 15 6 -1.5378 -4.0134 -4.8988 16 6 -1.6598 -5.5013 -5.1181 17 1 -1.7433 -5.6840 -6.1894 18 6 -2.8749 -6.1154 -4.4117 19 7 -2.4866 -7.4836 -4.0234 20 6 -3.2768 -8.3794 -3.3540 21 1 -2.8967 -9.3617 -3.1151 22 6 -4.5665 -8.0251 -2.9824 23 7 -5.0299 -6.8282 -3.2740 24 14 -5.6442 -9.2469 -2.0686 25 1 -5.4449 -9.0855 -0.6059 26 1 -7.0692 -8.9979 -2.4044 27 1 -5.2754 -10.6284 -2.4689 28 6 -1.1029 -7.7257 -4.4770 29 6 -0.4677 -6.3052 -4.5648 30 1 0.4017 -6.2711 -5.2214 31 6 -0.1366 -5.8733 -3.1349 32 1 -0.3632 0.0004 1.0277 33 1 -0.3633 0.8898 -0.5141 34 1 -0.3634 -0.8902 -0.5134 35 1 1.6583 2.1326 0.0004 36 1 4.1204 2.1326 0.0010 37 1 5.3518 0.0000 0.0005 38 1 4.1207 -2.1323 0.0110 39 1 0.5340 -2.3954 0.5913 40 1 2.0696 -3.2822 0.4363 41 1 0.1441 -4.5900 -0.9227 42 1 -1.1470 -2.6046 -3.3143 43 1 -2.0675 -4.0452 -2.8092 44 1 -0.7263 -3.6280 -5.5160 45 1 -2.4698 -3.5323 -5.1954 46 1 -3.1259 -5.5326 -3.5255 47 1 -3.7261 -6.1465 -5.0917 48 1 -5.9313 -6.5807 -3.0147 49 1 -1.1015 -8.2042 -5.4563 50 1 -0.5664 -8.3383 -3.7524 51 1 -0.9521 -6.1672 -2.4740 52 1 0.7796 -6.3689 -2.8141 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 ZINC000980257801.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 02:08:29 Heat of formation + Delta-G solvation = -4.472935 kcal Electronic energy + Delta-G solvation = -30372.040551 eV Core-core repulsion = 26528.881772 eV Total energy + Delta-G solvation = -3843.158778 eV No. of doubly occupied orbitals = 65 Molecular weight (most abundant/longest-lived isotopes) = 342.205 amu Computer time = 1.30 seconds Orbital eigenvalues (eV) -40.40520 -39.53164 -38.47688 -35.40840 -33.53146 -33.33354 -32.33854 -31.84782 -30.45402 -28.99429 -27.90878 -26.74483 -25.98254 -24.88958 -22.52714 -22.12948 -21.74651 -20.86053 -20.33629 -19.70554 -18.19056 -16.93274 -16.77269 -16.63879 -16.07442 -15.83186 -15.21122 -14.92196 -14.70009 -14.52332 -14.10424 -13.92021 -13.47759 -13.45239 -13.42951 -13.26880 -13.04425 -12.54102 -12.37572 -12.18535 -12.10524 -12.06041 -12.02816 -11.65126 -11.26845 -11.14337 -11.10861 -11.07761 -11.04291 -10.85125 -10.57544 -10.51593 -10.00434 -9.97046 -9.76502 -9.65804 -9.47457 -9.41958 -8.90379 -8.78400 -8.67598 -8.57536 -6.80051 -5.70367 -3.03009 1.20877 1.28584 2.71988 3.24082 3.38434 3.44252 3.45948 3.71753 4.48278 4.50105 4.64049 4.81269 4.87369 4.90998 5.03872 5.07473 5.15647 5.18712 5.29129 5.34852 5.42226 5.49665 5.52241 5.53397 5.57107 5.64244 5.68120 5.70063 5.79817 5.91224 5.93194 5.97863 6.00911 6.04957 6.12021 6.33706 6.35426 6.37604 6.41392 6.50486 6.51904 6.54566 6.63800 6.70216 6.72141 6.78295 6.89023 6.90755 7.04920 7.59236 7.63897 7.68087 7.86881 8.26588 8.33646 9.22981 9.83567 10.51407 11.41159 Molecular weight = 342.20amu Principal moments of inertia in cm(-1) A = 0.017418 B = 0.002440 C = 0.002340 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1607.172480 B =11474.356869 C =11960.717863 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.118 4.118 2 C -0.067 4.067 3 C -0.121 4.121 4 C -0.119 4.119 5 C -0.127 4.127 6 C -0.105 4.105 7 C -0.063 4.063 8 C -0.107 4.107 9 C 0.514 3.486 10 O -0.533 6.533 11 N -0.724 5.724 12 C 0.150 3.850 13 H 0.080 0.920 14 C -0.125 4.125 15 C -0.096 4.096 16 C -0.113 4.113 17 H 0.057 0.943 18 C 0.187 3.813 19 N -0.605 5.605 20 C -0.225 4.225 21 H 0.076 0.924 22 C -0.009 4.009 23 N -0.921 5.921 24 Si 0.909 3.091 25 H -0.290 1.290 26 H -0.291 1.291 27 H -0.282 1.282 28 C 0.137 3.863 29 C -0.091 4.091 30 H 0.074 0.926 31 C -0.114 4.114 32 H 0.070 0.930 33 H 0.067 0.933 34 H 0.067 0.933 35 H 0.120 0.880 36 H 0.119 0.881 37 H 0.119 0.881 38 H 0.119 0.881 39 H 0.103 0.897 40 H 0.100 0.900 41 H 0.399 0.601 42 H 0.057 0.943 43 H 0.074 0.926 44 H 0.053 0.947 45 H 0.062 0.938 46 H 0.050 0.950 47 H 0.039 0.961 48 H 0.251 0.749 49 H 0.017 0.983 50 H 0.039 0.961 51 H 0.084 0.916 52 H 0.054 0.946 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 15.380 12.713 7.013 21.151 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 -0.175 4.175 2 C -0.067 4.067 3 C -0.139 4.139 4 C -0.137 4.137 5 C -0.145 4.145 6 C -0.123 4.123 7 C -0.063 4.063 8 C -0.147 4.147 9 C 0.299 3.701 10 O -0.410 6.410 11 N -0.375 5.375 12 C 0.046 3.954 13 H 0.098 0.902 14 C -0.163 4.163 15 C -0.134 4.134 16 C -0.132 4.132 17 H 0.076 0.924 18 C 0.062 3.938 19 N -0.332 5.332 20 C -0.354 4.354 21 H 0.094 0.906 22 C -0.205 4.205 23 N -0.568 5.568 24 Si 0.740 3.260 25 H -0.217 1.217 26 H -0.218 1.218 27 H -0.208 1.208 28 C 0.011 3.989 29 C -0.111 4.111 30 H 0.092 0.908 31 C -0.152 4.152 32 H 0.089 0.911 33 H 0.086 0.914 34 H 0.086 0.914 35 H 0.138 0.862 36 H 0.137 0.863 37 H 0.137 0.863 38 H 0.137 0.863 39 H 0.121 0.879 40 H 0.119 0.881 41 H 0.233 0.767 42 H 0.076 0.924 43 H 0.093 0.907 44 H 0.071 0.929 45 H 0.081 0.919 46 H 0.068 0.932 47 H 0.057 0.943 48 H 0.061 0.939 49 H 0.035 0.965 50 H 0.057 0.943 51 H 0.103 0.897 52 H 0.073 0.927 Dipole moment (debyes) X Y Z Total from point charges 15.378 13.205 6.422 21.262 hybrid contribution -0.779 -0.966 0.758 1.454 sum 14.598 12.239 7.180 20.358 Atomic orbital electron populations 1.20844 0.91291 1.03305 1.02035 1.19722 0.95981 0.92583 0.98451 1.20983 0.94280 0.97328 1.01342 1.21094 0.94306 0.97948 1.00375 1.21048 0.99672 0.92504 1.01285 1.20966 0.93396 0.98189 0.99715 1.19138 0.93404 0.93185 1.00608 1.20731 1.02126 0.96366 0.95490 1.20414 0.77763 0.81042 0.90839 1.90719 1.53532 1.50633 1.46068 1.46177 1.57334 1.23977 1.09978 1.20675 0.97196 0.95528 0.81962 0.90190 1.21917 0.97315 0.99544 0.97525 1.20832 1.01030 0.95938 0.95608 1.21676 0.97622 0.93968 0.99963 0.92449 1.21040 0.91006 0.84597 0.97110 1.44597 1.09697 1.12460 1.66414 1.19043 0.93919 0.94256 1.28160 0.90620 1.24775 0.97311 0.97000 1.01434 1.69970 1.16806 1.18650 1.51423 0.86162 0.80056 0.80306 0.79492 1.21726 1.21756 1.20802 1.21826 0.87020 0.93356 0.96698 1.22201 0.96783 0.97381 0.94765 0.90819 1.21418 1.02006 0.93087 0.98699 0.91101 0.91395 0.91405 0.86202 0.86302 0.86257 0.86278 0.87860 0.88130 0.76659 0.92419 0.90730 0.92872 0.91940 0.93238 0.94315 0.93866 0.96529 0.94312 0.89733 0.92707 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 15. 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 -1.17 9.22 36.01 0.33 -0.84 16 2 C -0.07 -0.76 5.88 -104.62 -0.62 -1.37 16 3 C -0.12 -1.25 9.70 -39.58 -0.38 -1.63 16 4 C -0.12 -1.15 10.05 -39.58 -0.40 -1.55 16 5 C -0.13 -1.25 10.05 -39.58 -0.40 -1.64 16 6 C -0.10 -1.11 9.68 -39.58 -0.38 -1.49 16 7 C -0.06 -0.71 4.37 -104.62 -0.46 -1.17 16 8 C -0.11 -1.06 5.15 -29.04 -0.15 -1.20 16 9 C 0.51 6.76 7.02 -10.99 -0.08 6.68 16 10 O -0.53 -9.11 15.71 5.55 0.09 -9.02 16 11 N -0.72 -9.15 5.09 -54.52 -0.28 -9.43 16 12 C 0.15 2.22 2.38 -68.66 -0.16 2.06 16 13 H 0.08 1.28 7.61 -51.93 -0.40 0.88 16 14 C -0.12 -2.00 5.42 -26.66 -0.14 -2.14 16 15 C -0.10 -1.56 5.35 -27.87 -0.15 -1.70 16 16 C -0.11 -2.07 2.69 -90.93 -0.24 -2.32 16 17 H 0.06 1.04 8.14 -51.93 -0.42 0.62 16 18 C 0.19 4.38 4.39 -3.34 -0.01 4.36 16 19 N -0.61 -14.91 2.97 -169.58 -0.50 -15.41 16 20 C -0.23 -6.12 10.29 -15.06 -0.15 -6.27 16 21 H 0.08 2.00 7.83 -52.48 -0.41 1.58 16 22 C -0.01 -0.25 5.49 -17.43 -0.10 -0.35 16 23 N -0.92 -26.48 10.34 55.49 0.57 -25.91 16 24 Si 0.91 21.78 29.55 -169.99 -5.02 16.75 16 25 H -0.29 -6.90 7.11 56.52 0.40 -6.50 16 26 H -0.29 -7.09 7.11 56.52 0.40 -6.69 16 27 H -0.28 -6.63 7.11 56.52 0.40 -6.23 16 28 C 0.14 2.76 6.52 -1.91 -0.01 2.74 16 29 C -0.09 -1.54 3.69 -88.55 -0.33 -1.87 16 30 H 0.07 1.10 8.14 -51.93 -0.42 0.68 16 31 C -0.11 -1.79 4.23 -27.63 -0.12 -1.90 16 32 H 0.07 0.58 8.14 -51.93 -0.42 0.15 16 33 H 0.07 0.63 8.09 -51.93 -0.42 0.21 16 34 H 0.07 0.75 6.16 -51.93 -0.32 0.43 16 35 H 0.12 1.00 8.06 -52.49 -0.42 0.58 16 36 H 0.12 0.86 8.06 -52.49 -0.42 0.44 16 37 H 0.12 0.90 8.06 -52.48 -0.42 0.48 16 38 H 0.12 1.07 8.06 -52.49 -0.42 0.64 16 39 H 0.10 0.85 6.99 -51.93 -0.36 0.49 16 40 H 0.10 0.76 8.05 -51.93 -0.42 0.34 16 41 H 0.40 4.23 8.60 -40.82 -0.35 3.88 16 42 H 0.06 0.93 8.14 -51.93 -0.42 0.51 16 43 H 0.07 1.34 6.75 -51.93 -0.35 0.99 16 44 H 0.05 0.80 8.14 -51.93 -0.42 0.37 16 45 H 0.06 1.02 8.14 -51.93 -0.42 0.60 16 46 H 0.05 1.26 5.78 -51.93 -0.30 0.96 16 47 H 0.04 1.04 7.50 -51.94 -0.39 0.65 16 48 H 0.25 7.07 8.31 -40.82 -0.34 6.73 16 49 H 0.02 0.34 8.14 -51.93 -0.42 -0.08 16 50 H 0.04 0.75 8.00 -51.92 -0.42 0.34 16 51 H 0.08 1.57 7.24 -51.93 -0.38 1.19 16 52 H 0.05 0.78 8.14 -51.93 -0.42 0.35 16 LS Contribution 400.82 15.07 6.04 6.04 Total: -1.00 -32.22 400.82 -11.77 -43.99 By element: Atomic # 1 Polarization: 13.31 SS G_CDS: -8.72 Total: 4.59 kcal Atomic # 6 Polarization: -7.66 SS G_CDS: -3.95 Total: -11.61 kcal Atomic # 7 Polarization: -50.53 SS G_CDS: -0.21 Total: -50.74 kcal Atomic # 8 Polarization: -9.11 SS G_CDS: 0.09 Total: -9.02 kcal Atomic # 14 Polarization: 21.78 SS G_CDS: -5.02 Total: 16.75 kcal Total LS contribution 6.04 Total: 6.04 kcal Total: -32.22 -11.77 -43.99 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. ZINC000980257801.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 39.517 kcal (2) G-P(sol) polarization free energy of solvation -32.215 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 7.302 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -11.775 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -43.990 kcal (6) G-S(sol) free energy of system = (1) + (5) -4.473 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.30 seconds