NMR and chemical shifts in NWChem


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Thanks, Niri, with your help it looks a lot less complicated.
Here is my try for P(Me)3

          -----------------------------------------
          Chemical Shielding Tensors (GIAO, in ppm)
          -----------------------------------------

 Grid integrated density:      42.000015081313
 Requested integration accuracy:   0.10E-06
                                NWChem CPHF Module
                                ------------------


  scftype          =     RHF 
  nclosed          =       21
  nopen            =        0
  variables        =     1281
  # of vectors     =        3
  tolerance        = 0.10D-03
  level shift      = 0.00D+00
  max iterations   =       50
  max subspace     =       30


 Integral file          = ./molecule.aoints.0
 Record size in doubles =  65536        No. of integs per rec  =  43688
 Max. records in memory =     47        Max. records in file   =  27313
 No. of bits per label  =      8        No. of bits per value  =     64


 #quartets = 4.513D+05 #integrals = 5.434D+06 #direct =  0.0% #cached =100.0%


File balance: exchanges=     2  moved=    11  time=   0.0

 Grid integrated density:      42.000015081313
 Requested integration accuracy:   0.10E-06
 SCF residual:    1.4943092224402321E-004


Iterative solution of linear equations
  No. of variables     1281
  No. of equations        3
  Maximum subspace       30
        Iterations       50
       Convergence  1.0D-04
        Start time     40.0


   iter   nsub   residual    time
   ----  ------  --------  ---------
     1      3    4.48D-01      47.1
     2      6    2.25D-02      55.3
     3      9    9.19D-04      62.1
     4     12    1.91D-05      68.9

 Parallel integral file used     127 records with       0 large values


 Wrote CPHF data to ./molecule.shieldcphf

 Calc. par tensor-> nonrel
      Atom:    1  P 
        Diamagnetic
    968.1936     -0.0016     -0.0002
     -0.0016    968.2032      0.0038
     -0.0002      0.0038    961.6820

        Paramagnetic
   -529.1638     -0.0271     -0.2429
     -0.0271   -529.0450      0.3423
     -0.2429      0.3423   -549.2152

        Total Shielding Tensor
    439.0298     -0.0287     -0.2431
     -0.0287    439.1582      0.3460
     -0.2431      0.3460    412.4668

           isotropic =     430.2183
          anisotropy =      13.4277

          Principal Components and Axis System
                 1           2           3
              439.1701    439.0247    412.4601

      1        -0.2249      0.9743      0.0091
      2         0.9743      0.2250     -0.0129
      3         0.0147     -0.0060      0.9999




 Task  times  cpu:       62.7s     wall:       68.4s


                                NWChem Input Module
                                -------------------


 Summary of allocated global arrays
-----------------------------------
  No active global arrays



                         GA Statistics for process    0
                         ------------------------------

       create   destroy   get      put      acc     scatter   gather  read&inc
calls:  378      378     1.76e+06 3846     6.15e+05  100        0      569     
number of processes/call 1.02e+00 1.67e+00 1.10e+00 1.94e+00 0.00e+00
bytes total:             1.69e+08 6.63e+06 1.38e+08 1.05e+06 0.00e+00 4.55e+03
bytes remote:            1.07e+08 2.13e+06 1.01e+08 -3.86e+05 0.00e+00 0.00e+00
Max memory consumed for GA by this process: 744952 bytes

MA_summarize_allocated_blocks: starting scan ...
MA_summarize_allocated_blocks: scan completed: 0 heap blocks, 0 stack blocks
MA usage statistics:

	allocation statistics:
					      heap	     stack
					      ----	     -----
	current number of blocks	         0	         0
	maximum number of blocks	        26	        51
	current total bytes		         0	         0
	maximum total bytes		  30913032	  22515096
	maximum total K-bytes		     30914	     22516
	maximum total M-bytes		        31	        23


And I'm expecting a shift at about -62 ppm relative to 85% H3PO4. Is there any analysis tool to extract such values from my outputs? Can you show me how to do it?
Henrique C. S. Junior
Inorganic Chemist - UFRRJ - Rio de Janeiro