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    #1 2023-03-01 00:24:34

    choconostle123
    Member
    Registered: 2020-09-16
    Posts: 10

    Optimization with field

    Hello everyone, I have a problem with optimization with Gaussian with electric field
    i want to get the wavefunction with the imput that is below but in the file .log don't converge the parameter maximum force:


    Maximum Force                0.001404     0.000450     NO
    RMS     Force                    0.000239     0.000300     YES
    Maximum Displacement     0.001001     0.001800     YES
    RMS     Displacement         0.000265     0.001200     YES

    i compute a optimization with AM1 and after that reoptimize with wb97x and finally i tried to carry on the optimization with electric field

    can somebody help me?


    Imput
    ######################################################################################
    # wb97x/6-311g(d,p) opt=z-matrix
    field=z+25 nosymm output=wfx

    Title

    0 1

    C   1 B1
    C   2 B2 1 A2
    C   3 B3 2 A3 1 D3
    C   4 B4 3 A4 2 D4
    C   1 B5 2 A5 3 D5
    H   1 B6 2 A6 3 D6
    H   2 B7 1 A7 3 D7
    H   4 B8 3 A8 2 D8
    H   5 B9 4 A9 3 D9
    N   6 B10 1 A10 2 D10
    C   11 B11 6 A11 1 D11
    H   12 B12 11 A12 6 D12
    H   12 B13 11 A13 6 D13
    H   12 B14 11 A14 6 D14
    C   11 B15 6 A15 1 D15
    H   16 B16 11 A16 6 D16
    H   16 B17 11 A17 6 D17
    H   16 B18 11 A18 6 D18
    C   3 B19 2 A19 1 D19
    C   20 B20 3 A20 2 D20
    C   20 B21 3 A21 2 D21
    C   21 B22 20 A22 3 D22
    C   21 B23 20 A23 3 D23
    N   2 B24 1 A24 3 D24
    N   2 B25 1 A25 3 D25
    N   2 B26 1 A26 3 D26
    Variables:
    B1        1.37560
    B2        1.40539
    A2      121.86975
    B3        1.40508
    A3      117.26966
    D3        1.95844
    B4        1.37577
    A4      121.48013
    D4      358.75293
    B5        1.41364
    A5      120.84104
    D5      359.06738
    B6        1.08201
    A6      118.60060
    D6      179.33656
    B7        1.08556
    A7      118.45003
    D7      180.53095
    B8        1.08248
    A8      120.72238
    D8      177.22259
    B9        1.08205
    A9      118.41558
    D9      179.11626
    B10        1.36166
    A10      121.39303
    D10      179.73340
    B11        1.45061
    A11      120.14828
    D11        1.16008
    B12        1.09642
    A12      111.72966
    D12       61.40646
    B13        1.08892
    A13      109.11361
    D13      180.79604
    B14        1.09567
    A14      111.51731
    D14      299.90691
    B15        1.45093
    A15      120.22106
    D15      178.83967
    B16        1.09547
    A16      111.44904
    D16       59.54934
    B17        1.08887
    A17      109.04696
    D17      178.60271
    B18        1.09642
    A18      111.76132
    D18      298.02621
    B19        1.45906
    A19      119.44899
    D19      181.09297
    B20        1.36427
    A20      128.48543
    D20      159.33459
    B21        1.44441
    A21      115.69955
    D21      340.11136
    B22        1.43375
    A22      121.32581
    D22      178.10742
    B23        1.43167
    A23      123.77609
    D23      356.41187
    B24        5.20007
    A24      117.64799
    D24      342.65979
    B25        5.90532
    A25      162.72252
    D25      350.93398
    B26        3.48548
    A26      157.23346
    D26      147.09305

    Last edited by choconostle123 (2023-03-01 00:29:56)

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    #2 2023-03-01 07:22:04

    sobereva
    Tian Lu (Multiwfn developer)
    From: Beijing
    Registered: 2017-09-11
    Posts: 1,468
    Website

    Re: Optimization with field

    Remove "=z-matrix", usually it hurts geometry convergence.

    It it still doesn't converge, use opt(gdiis,maxstep=5,notrust), this keywords is useful in suppressing possible oscillating behavior.

    By the way, wb97XD is a much better choice than wb97X for common cases. I employed this functional in optimizing cyclo[18]carbon under external field in my recent work ChemPhysChem 2021, 22, 386 –395 (doi.org/10.1002/cphc.202000903)

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