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fwang2011金蟲 (小有名氣)
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[求助]
分子軌道數(shù) 和 本征值數(shù)目 的關(guān)系
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可能這并不僅僅是個GAMESS的問題,更像一個基本的量化計算問題。 以水為例,if we run the following: $CONTRL SCFTYP=RHF RUNTYP=OPTIMIZE MAXIT=30 MULT=1 MOLPLT=.TRUE. $END $SYSTEM TIMLIM=525600 MEMORY=1000000 $END $BASIS GBASIS=N31 NGAUSS=6 NDFUNC=1 $END $SCF DIRSCF=.TRUE. $END $STATPT OPTTOL=0.0001 NSTEP=200 HSSEND=.t. $END $FORCE METHOD=ANALYTIC VIBANL=.TRUE. $END $DATA Test run of H2O CNV 2 O 8.0 0.00000 0.00000 0.00000 H 1.0 -0.75800 0.00000 0.54500 $END 在輸出文件的最后,we will find the following output in the final MO: 11 12 13 14 15 1.1785 1.3851 1.4312 2.0206 2.0306 A1 B1 A1 A1 A2 1 O 1 S -0.051055 0.000000 -0.085666 -0.007482 0.000000 2 O 1 S -0.052893 0.000000 -1.443495 -0.078523 0.000000 3 O 1 X 0.000000 -1.040316 0.000000 0.000000 0.000000 4 O 1 Y 0.000000 0.000000 0.000000 0.000000 0.000000 5 O 1 Z 0.731788 0.000000 -0.501204 -0.002830 0.000000 6 O 1 S 0.411818 0.000000 3.637788 0.234068 0.000000 7 O 1 X 0.000000 1.540982 0.000000 0.000000 0.000000 8 O 1 Y 0.000000 0.000000 0.000000 0.000000 0.000000 9 O 1 Z -0.315514 0.000000 1.158296 0.130567 0.000000 10 O 1 XX -0.249651 0.000000 -0.643896 0.563979 0.000000 11 O 1 YY 0.080110 0.000000 -0.293083 0.385254 0.000000 12 O 1 ZZ -0.063729 0.000000 -0.403630 -1.011299 0.000000 13 O 1 XY 0.000000 0.000000 0.000000 0.000000 1.000000 14 O 1 XZ 0.000000 0.026841 0.000000 0.000000 0.000000 15 O 1 YZ 0.000000 0.000000 0.000000 0.000000 0.000000 16 H 2 S -0.694183 0.108435 -0.301211 -0.080583 0.000000 17 H 2 S 0.368089 -0.934728 -0.812287 -0.037357 0.000000 18 H 3 S -0.694183 -0.108435 -0.301211 -0.080583 0.000000 19 H 3 S 0.368089 0.934728 -0.812287 -0.037357 0.000000 也就是說這里只有15個MO。 但是,檢查一下我們知道: TOTAL NUMBER OF BASIS SET SHELLS = 8 NUMBER OF CARTESIAN GAUSSIAN BASIS FUNCTIONS = 19 這里”NUMBER OF CARTESIAN GAUSSIAN BASIS FUNCTIONS“ 等于19,也就是將有19個本征值。這也可以從輸出文件中驗證。 我的問題是: 如何解釋這個不同?因為不同的basis選擇就會有不同的NUMBER OF CARTESIAN GAUSSIAN BASIS FUNCTIONS,也就會有不同的數(shù)量的”eigenvalues“(最終解釋為分子軌道)。 相關(guān)書籍推薦? 謝謝。 |
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金蟲 (小有名氣)
金蟲 (小有名氣)
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For more information in this topic, please go to (you have to a member of it): https://groups.google.com/d/topic/gamess/OBhW8maYlyE/discussion For those who cannot/don't access the page, I copied the one which I think as answer for your reference. And the reference is in statp.scr C*MODULE STATPT *DECK SIGEND SUBROUTINE SIGEND line 5359 NMOPRT = MIN(L0,NOCC+10) in human language min(size of basis, number of occ+10) min(19,10+5)=15 Robert Balawender btw Sean >>In 6-31G(d), 2*H has 2*4 primitives and O has 11 primitives >> (including >> the extra d function), giving a total of 19. 19 is a number of the contracted gaussian and all your answer is wrong - show quoted text - -- dr Robert Balawender Instytut Chemii Fizycznej PAN ul. Kasprzaka 44/52 01-224 Warszawa |
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