Feature Requests item #2975200, was opened at 2010-03-23 23:14
Message generated for change (Tracker Item Submitted) made by ghermitage
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Category: New IO Format
Group: None
Status: Open
Priority: 5
Private: No
Submitted By: Granger Hermitage (ghermitage)
Assigned to: Nobody/Anonymous (nobody)
Summary: Accept NBO PLOT format

Initial Comment:
Actually, there is a neater way to visualize Natural Bond Orbitals than I asked 
for in feature request 2974999.
When PLOT (it has no subparameters) is specified in the NBO parameter list, all 
files needed for visualization are produced. The NBO parameter list ($NBO ... 
$END) appears in the electronic structure system input if NBO is embedded in 
the ESS, and appears in the .47 input file to GenNBO if NBO is being run 
standalone. $NBO AONBO=P $END is not necessary, for $NBO PLOT $END will output 
what is needed for visualization of all natural orbital types not just NBO in 
AO basis. Indeed, PNBO (prenormalized NBO) may be more useful for visualization 
of overlaps than NBO. PLOT causes the generation of these file types:
molname.31     AO
molname.32     PNAO
molname.33     NAO
molname.34     PNHO
molname.35     NHO
molname.36     PNBO
molname.37     NBO
molname.38     PNLMO
molname.39     NLMO
molname.40     MO
molname.41     AO density matrix
molname.46     Basis label file

Regardless of what ESS NBO 5 is imbedded in or what ESS GenNBO 5 derives its 
input from the format of these files is unchanged, so this is a completely 
uniform input for natural orbital visualization. Also, these inputs make a 
visualization tool fully functional for all natural orbital types. Also, all 
these types of natural orbitals (including PNBO) are available in a machine 
oriented format rather than having to be picked out of various places in a 
somewhat more human oriented format of an ESS log or output file or nbo output 
file (.nbo). Also, the formats .31 .. .41, .46 could be expected to be more 
stable across NBO updates than that of log files that might see modification in 
the interests of human readability.  

The .31 file must be present for visualization as it contains such good things 
as atomic number. The different types of natural orbitals are useful depending 
on what is being investigated. The thing to do would be to supply a 
directoryname/molname and let all the .31-.41,.46 be loaded with a single 
command, then specify what basis you wanted to be working in at that moment.

I will attach a zipped sample file of each file type, though the .33 file might 
have to be compressed with another method, say zipx, to get under the upload 
limit. 

I can imagine Jmol quite rapidly becoming the best tool to visualize natural 
orbitals.


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