Wall clock time and date at job start Wed Apr 1 2020 02:07:29 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 1.50696 * 1 3 3 C 1.38239 * 120.00064 * 2 1 4 4 C 1.38234 * 119.99666 * 180.27263 * 3 2 1 5 5 C 1.38238 * 120.00388 * 359.46658 * 4 3 2 6 6 C 1.38238 * 119.99613 * 0.55310 * 5 4 3 7 7 C 1.50693 * 119.99599 * 179.72083 * 6 5 4 8 8 C 1.38234 * 119.99909 * 180.02562 * 2 1 3 9 9 C 1.50697 * 120.00455 * 0.02562 * 8 2 1 10 10 C 1.50703 * 109.46943 * 89.99530 * 9 8 2 11 11 O 1.21274 * 120.00047 * 0.02562 * 10 9 8 12 12 N 1.34780 * 119.99704 * 180.02562 * 10 9 8 13 13 C 1.46500 * 120.00074 * 180.02562 * 12 10 9 14 14 H 1.09001 * 115.54766 * 350.68808 * 13 12 10 15 15 C 1.53029 * 117.50382 * 136.41708 * 13 12 10 16 16 C 1.52816 * 117.50410 * 205.00419 * 13 12 10 17 17 C 1.53187 * 117.71357 * 144.89924 * 16 13 12 18 18 C 1.53350 * 108.76995 * 158.89015 * 17 16 13 19 19 N 1.46841 * 108.81579 * 51.30745 * 18 17 16 20 20 C 1.36929 * 120.38478 * 123.07955 * 19 18 17 21 21 H 1.08002 * 120.00147 * 208.95720 * 20 19 18 22 22 C 1.38814 * 120.00285 * 28.95138 * 20 19 18 23 23 N 1.31612 * 119.99797 * 17.86027 * 22 20 19 24 24 Si 1.86802 * 120.00137 * 197.85961 * 22 20 19 25 25 H 1.48504 * 109.47032 * 59.99992 * 24 22 20 26 26 H 1.48494 * 109.46956 * 179.97438 * 24 22 20 27 27 H 1.48500 * 109.47127 * 300.00021 * 24 22 20 28 28 C 1.46857 * 119.23121 * 303.09709 * 19 18 17 29 29 C 1.53185 * 117.71216 * 0.13618 * 16 13 12 30 30 H 1.09001 * 109.46960 * 90.00405 * 1 2 3 31 31 H 1.08998 * 109.47288 * 210.00008 * 1 2 3 32 32 H 1.09002 * 109.47490 * 330.00454 * 1 2 3 33 33 H 1.08001 * 119.99559 * 0.02562 * 3 2 1 34 34 H 1.07999 * 119.99559 * 179.72774 * 4 3 2 35 35 H 1.07997 * 119.99784 * 180.27899 * 5 4 3 36 36 H 1.09004 * 109.47260 * 269.98039 * 7 6 5 37 37 H 1.08999 * 109.47693 * 29.98007 * 7 6 5 38 38 H 1.09000 * 109.47106 * 149.98063 * 7 6 5 39 39 H 1.09000 * 109.47613 * 209.99692 * 9 8 2 40 40 H 1.09004 * 109.46751 * 330.00001 * 9 8 2 41 41 H 0.96999 * 120.00183 * 0.02562 * 12 10 9 42 42 H 1.08997 * 117.50302 * 214.95819 * 15 13 12 43 43 H 1.08996 * 117.50048 * 0.02562 * 15 13 12 44 44 H 1.08999 * 109.58866 * 278.67489 * 17 16 13 45 45 H 1.08999 * 109.58501 * 39.10273 * 17 16 13 46 46 H 1.09004 * 109.57752 * 291.50981 * 18 17 16 47 47 H 1.08993 * 109.68913 * 171.17247 * 18 17 16 48 48 H 0.97002 * 120.00217 * 180.02562 * 23 22 20 49 49 H 1.08996 * 109.57933 * 297.11101 * 28 19 18 50 50 H 1.09004 * 109.57717 * 176.70715 * 28 19 18 51 51 H 1.08996 * 109.59257 * 320.90013 * 29 16 13 52 52 H 1.09003 * 109.58441 * 81.18860 * 29 16 13 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 2.1982 1.1972 0.0000 4 6 3.5805 1.1971 -0.0057 5 6 4.2717 -0.0001 -0.0002 6 6 3.5805 -1.1972 -0.0007 7 6 4.3340 -2.5022 -0.0011 8 6 2.1981 -1.1971 -0.0005 9 6 1.4447 -2.5023 -0.0017 10 6 1.1940 -2.9363 -1.4230 11 8 1.5887 -2.2533 -2.3441 12 7 0.5312 -4.0835 -1.6702 13 6 0.2879 -4.5057 -3.0518 14 1 0.5302 -3.7693 -3.8180 15 6 0.5167 -5.9804 -3.3907 16 6 -0.9051 -5.4254 -3.3090 17 6 -1.6743 -5.2443 -4.6214 18 6 -2.4430 -6.5359 -4.9250 19 7 -3.2213 -6.9140 -3.7386 20 6 -4.5783 -7.0761 -3.8233 21 1 -5.1994 -6.8900 -2.9595 22 6 -5.1559 -7.4798 -5.0193 23 7 -4.4148 -8.0391 -5.9521 24 14 -6.9848 -7.2290 -5.3048 25 1 -7.3047 -5.7812 -5.2225 26 1 -7.3505 -7.7406 -6.6500 27 1 -7.7530 -7.9653 -4.2690 28 6 -2.5274 -7.1157 -2.4601 29 6 -1.7606 -5.8357 -2.1064 30 1 -0.3633 -0.0001 -1.0277 31 1 -0.3634 -0.8900 0.5138 32 1 -0.3634 0.8900 0.5138 33 1 1.6581 2.1325 0.0004 34 1 4.1205 2.1324 -0.0101 35 1 5.3517 0.0000 -0.0001 36 1 4.5154 -2.8167 -1.0289 37 1 5.2866 -2.3720 0.5125 38 1 3.7451 -3.2620 0.5128 39 1 2.0336 -3.2623 0.5118 40 1 0.4921 -2.3723 0.5119 41 1 0.2152 -4.6295 -0.9335 42 1 0.9096 -6.2144 -4.3801 43 1 0.8477 -6.6364 -2.5857 44 1 -2.3760 -4.4161 -4.5223 45 1 -0.9734 -5.0374 -5.4301 46 1 -1.7387 -7.3315 -5.1686 47 1 -3.1160 -6.3735 -5.7668 48 1 -4.8183 -8.3209 -6.7880 49 1 -1.8284 -7.9469 -2.5511 50 1 -3.2563 -7.3325 -1.6792 51 1 -1.1171 -6.0212 -1.2464 52 1 -2.4653 -5.0384 -1.8702 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 ZINC001016643039.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 02:07:29 Heat of formation + Delta-G solvation = 23.613503 kcal Electronic energy + Delta-G solvation = -29837.681641 eV Core-core repulsion = 25995.740782 eV Total energy + Delta-G solvation = -3841.940859 eV No. of doubly occupied orbitals = 65 Molecular weight (most abundant/longest-lived isotopes) = 342.205 amu Computer time = 1.50 seconds Orbital eigenvalues (eV) -40.52493 -39.44976 -38.19770 -35.47750 -33.78333 -33.59230 -33.00464 -31.58783 -30.04346 -29.13550 -28.21737 -26.84029 -26.75599 -24.35095 -22.63790 -22.45209 -21.32547 -20.88267 -20.60340 -20.14422 -18.22436 -17.26361 -16.66953 -16.47255 -16.30554 -15.82968 -14.85299 -14.75243 -14.66953 -14.41020 -14.05959 -13.73382 -13.52147 -13.47589 -13.32254 -13.19643 -13.12506 -13.03985 -12.86291 -12.72989 -12.54824 -12.23894 -11.78307 -11.76837 -11.63674 -11.55987 -11.31342 -11.07716 -11.02759 -10.95115 -10.72386 -10.45759 -10.33991 -9.98362 -9.94039 -9.68818 -9.63056 -9.35806 -8.74407 -8.67813 -8.45086 -8.43903 -6.64693 -5.79329 -3.22636 1.17897 1.23560 2.59197 3.09849 3.37776 3.43974 3.45209 3.63382 4.18331 4.38402 4.49219 4.58018 4.69748 4.76909 4.83468 4.83884 4.99131 5.03465 5.13963 5.15218 5.16493 5.22093 5.38782 5.42051 5.45314 5.46176 5.49195 5.56277 5.63467 5.64578 5.68799 5.87274 5.97657 6.03992 6.06353 6.06569 6.10931 6.28322 6.32956 6.37333 6.43299 6.50174 6.58934 6.61479 6.64296 6.69618 6.83210 6.87404 6.95505 7.36223 7.51760 7.67071 7.78773 8.24099 8.46108 9.21295 9.84933 10.41613 11.28379 Molecular weight = 342.20amu Principal moments of inertia in cm(-1) A = 0.021558 B = 0.002167 C = 0.002072 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1298.535761 B =12918.072941 C =13511.925455 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.120 4.120 2 C -0.065 4.065 3 C -0.128 4.128 4 C -0.113 4.113 5 C -0.128 4.128 6 C -0.067 4.067 7 C -0.119 4.119 8 C -0.065 4.065 9 C -0.111 4.111 10 C 0.518 3.482 11 O -0.532 6.532 12 N -0.698 5.698 13 C 0.070 3.930 14 H 0.130 0.870 15 C -0.183 4.183 16 C -0.096 4.096 17 C -0.105 4.105 18 C 0.173 3.827 19 N -0.589 5.589 20 C -0.254 4.254 21 H 0.064 0.936 22 C 0.003 3.997 23 N -0.901 5.901 24 Si 0.901 3.099 25 H -0.284 1.284 26 H -0.291 1.291 27 H -0.283 1.283 28 C 0.150 3.850 29 C -0.096 4.096 30 H 0.074 0.926 31 H 0.067 0.933 32 H 0.066 0.934 33 H 0.120 0.880 34 H 0.119 0.881 35 H 0.119 0.881 36 H 0.073 0.927 37 H 0.066 0.934 38 H 0.066 0.934 39 H 0.104 0.896 40 H 0.105 0.895 41 H 0.400 0.600 42 H 0.097 0.903 43 H 0.090 0.910 44 H 0.060 0.940 45 H 0.051 0.949 46 H 0.018 0.982 47 H 0.090 0.910 48 H 0.254 0.746 49 H 0.019 0.981 50 H 0.054 0.946 51 H 0.045 0.955 52 H 0.063 0.937 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 16.091 13.282 14.470 25.391 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 -0.176 4.176 2 C -0.066 4.066 3 C -0.146 4.146 4 C -0.131 4.131 5 C -0.146 4.146 6 C -0.067 4.067 7 C -0.175 4.175 8 C -0.066 4.066 9 C -0.150 4.150 10 C 0.304 3.696 11 O -0.407 6.407 12 N -0.348 5.348 13 C -0.036 4.036 14 H 0.148 0.852 15 C -0.221 4.221 16 C -0.098 4.098 17 C -0.145 4.145 18 C 0.047 3.953 19 N -0.311 5.311 20 C -0.384 4.384 21 H 0.081 0.919 22 C -0.196 4.196 23 N -0.545 5.545 24 Si 0.731 3.269 25 H -0.210 1.210 26 H -0.216 1.216 27 H -0.209 1.209 28 C 0.023 3.977 29 C -0.136 4.136 30 H 0.093 0.907 31 H 0.086 0.914 32 H 0.085 0.915 33 H 0.138 0.862 34 H 0.137 0.863 35 H 0.137 0.863 36 H 0.092 0.908 37 H 0.085 0.915 38 H 0.085 0.915 39 H 0.122 0.878 40 H 0.123 0.877 41 H 0.235 0.765 42 H 0.116 0.884 43 H 0.109 0.891 44 H 0.078 0.922 45 H 0.069 0.931 46 H 0.036 0.964 47 H 0.108 0.892 48 H 0.064 0.936 49 H 0.037 0.963 50 H 0.072 0.928 51 H 0.063 0.937 52 H 0.082 0.918 Dipole moment (debyes) X Y Z Total from point charges 16.313 13.699 13.643 25.296 hybrid contribution -0.977 -0.194 0.079 0.999 sum 15.336 13.505 13.722 24.615 Atomic orbital electron populations 1.20888 0.91309 1.02604 1.02844 1.19695 0.95918 0.92551 0.98392 1.20943 0.94260 0.97268 1.02087 1.21070 0.94292 0.97840 0.99941 1.20926 0.99527 0.91946 1.02224 1.19670 0.92939 0.95460 0.98650 1.20872 0.99643 0.94309 1.02688 1.18906 0.92714 0.93080 1.01873 1.20787 1.02470 0.96567 0.95225 1.20405 0.77593 0.80589 0.91009 1.90710 1.50354 1.53491 1.46193 1.45434 1.57511 1.23863 1.07997 1.21883 1.04327 0.93012 0.84335 0.85191 1.23521 1.00161 0.95618 1.02843 1.21949 0.88744 1.00339 0.98761 1.21871 0.98111 1.01937 0.92557 1.20763 0.93276 0.90134 0.91136 1.43963 1.03832 1.79058 1.04284 1.19131 0.82102 1.39503 0.97671 0.91872 1.25049 0.97728 0.98243 0.98567 1.70020 1.35072 1.41679 1.07737 0.86391 0.85359 0.78066 0.77082 1.21028 1.21642 1.20883 1.20838 0.94359 0.92723 0.89782 1.21619 0.97568 1.00678 0.93714 0.90723 0.91399 0.91491 0.86215 0.86253 0.86265 0.90843 0.91546 0.91474 0.87834 0.87722 0.76524 0.88427 0.89113 0.92161 0.93067 0.96390 0.89178 0.93562 0.96332 0.92763 0.93671 0.91808 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 18. 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 -1.12 9.60 36.00 0.35 -0.77 16 2 C -0.07 -0.71 5.88 -104.63 -0.62 -1.33 16 3 C -0.13 -1.29 9.70 -39.58 -0.38 -1.67 16 4 C -0.11 -1.08 10.05 -39.58 -0.40 -1.48 16 5 C -0.13 -1.26 9.70 -39.58 -0.38 -1.65 16 6 C -0.07 -0.71 5.88 -104.62 -0.62 -1.33 16 7 C -0.12 -1.01 9.60 36.00 0.35 -0.67 16 8 C -0.07 -0.72 4.37 -104.62 -0.46 -1.18 16 9 C -0.11 -1.04 5.02 -29.03 -0.15 -1.19 16 10 C 0.52 6.61 7.82 -10.98 -0.09 6.52 16 11 O -0.53 -8.99 15.60 5.56 0.09 -8.90 16 12 N -0.70 -8.41 5.35 -53.88 -0.29 -8.69 16 13 C 0.07 1.01 6.14 -68.01 -0.42 0.59 16 14 H 0.13 2.10 7.40 -51.93 -0.38 1.71 16 15 C -0.18 -2.62 9.86 -26.79 -0.26 -2.88 16 16 C -0.10 -1.56 1.94 -154.49 -0.30 -1.86 16 17 C -0.11 -2.00 5.83 -26.45 -0.15 -2.15 16 18 C 0.17 4.05 5.41 -3.68 -0.02 4.03 16 19 N -0.59 -14.43 2.94 -172.25 -0.51 -14.94 16 20 C -0.25 -6.87 9.54 -15.06 -0.14 -7.02 16 21 H 0.06 1.67 7.89 -52.49 -0.41 1.26 16 22 C 0.00 0.08 4.88 -17.43 -0.09 -0.01 16 23 N -0.90 -25.92 11.23 55.49 0.62 -25.29 16 24 Si 0.90 21.51 29.59 -169.99 -5.03 16.48 16 25 H -0.28 -6.73 7.11 56.52 0.40 -6.32 16 26 H -0.29 -6.99 7.11 56.52 0.40 -6.59 16 27 H -0.28 -6.65 7.11 56.52 0.40 -6.25 16 28 C 0.15 3.01 6.52 -3.67 -0.02 2.99 16 29 C -0.10 -1.55 5.37 -26.46 -0.14 -1.69 16 30 H 0.07 0.79 8.14 -51.93 -0.42 0.37 16 31 H 0.07 0.55 5.95 -51.93 -0.31 0.24 16 32 H 0.07 0.51 8.09 -51.93 -0.42 0.09 16 33 H 0.12 0.97 8.06 -52.49 -0.42 0.55 16 34 H 0.12 0.86 8.06 -52.49 -0.42 0.43 16 35 H 0.12 0.93 8.06 -52.49 -0.42 0.50 16 36 H 0.07 0.70 8.14 -51.93 -0.42 0.28 16 37 H 0.07 0.45 8.09 -51.93 -0.42 0.03 16 38 H 0.07 0.49 5.95 -51.93 -0.31 0.18 16 39 H 0.10 0.74 5.95 -51.93 -0.31 0.44 16 40 H 0.10 0.80 5.95 -51.93 -0.31 0.49 16 41 H 0.40 3.89 7.12 -40.82 -0.29 3.60 16 42 H 0.10 1.40 8.14 -51.93 -0.42 0.97 16 43 H 0.09 1.19 8.14 -51.93 -0.42 0.77 16 44 H 0.06 1.20 8.14 -51.93 -0.42 0.77 16 45 H 0.05 0.89 8.10 -51.93 -0.42 0.47 16 46 H 0.02 0.44 8.14 -51.93 -0.42 0.02 16 47 H 0.09 2.38 5.93 -51.93 -0.31 2.08 16 48 H 0.25 7.10 8.31 -40.82 -0.34 6.76 16 49 H 0.02 0.38 8.14 -51.93 -0.42 -0.04 16 50 H 0.05 1.07 7.92 -51.93 -0.41 0.66 16 51 H 0.04 0.58 6.75 -51.93 -0.35 0.23 16 52 H 0.06 1.08 8.14 -51.93 -0.42 0.65 16 LS Contribution 407.84 15.07 6.15 6.15 Total: -1.00 -32.25 407.84 -11.35 -43.60 By element: Atomic # 1 Polarization: 12.79 SS G_CDS: -8.44 Total: 4.35 kcal Atomic # 6 Polarization: -8.80 SS G_CDS: -3.94 Total: -12.74 kcal Atomic # 7 Polarization: -48.76 SS G_CDS: -0.17 Total: -48.93 kcal Atomic # 8 Polarization: -8.99 SS G_CDS: 0.09 Total: -8.90 kcal Atomic # 14 Polarization: 21.51 SS G_CDS: -5.03 Total: 16.48 kcal Total LS contribution 6.15 Total: 6.15 kcal Total: -32.25 -11.35 -43.60 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. ZINC001016643039.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 67.212 kcal (2) G-P(sol) polarization free energy of solvation -32.246 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 34.966 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -11.352 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -43.598 kcal (6) G-S(sol) free energy of system = (1) + (5) 23.614 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.50 seconds