From chemistry-request@www.ccl.net  Mon Feb  8 06:10:31 1999
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Date: Mon, 08 Feb 1999 13:24:56 +0100
From: Akos Papp <akospapp@compudrug.hu>
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Subject: pKa and pKb calculation
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Dear Steven,

There is a software available on the market for acidic and basic
pKa-values of organic compounds. It estimates pKa using Hammett and Taft
equations. It contains of approximately 1400 fragments (including ~600
ionizable center types).

If you need more info, please contact Ms. Aida Citti (e-mail address
above; I've carbon-copied this message to her).

Sincerely,

Akos Papp


From chemistry-request@www.ccl.net  Mon Feb  8 08:55:06 1999
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From: Victor Milman <vmilman@msi.com>
Subject: Re: CCL:G:Scanning Probe Microscopy
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Hello,

Here are some recent papers based on the plane-wave technology:

R. Perez, I. Stich, M. C. Payne, K. Terakura,
Surface-Tip Interactions in Noncontact Atomic-Force Microscopy on
Reactive Surfaces: Si(111),
Phys. Rev. B58 (1998) 10835.
http://www.msi.com/science/online/references/CASTEP_list/Abs/Perez.PRB_1998_58_10835.html

R. Perez, M. C. Payne, I. Stich, K. Terakura,
Contrast Mechanism in Non-Contact AFM on Reactive Surfaces,
Appl. Surf. Sci. 123 (1998) 249.
http://www.msi.com/science/online/references/CASTEP_list/Abs/Perez.ASS_1998_123_249.html

R. Perez, M. C. Payne, I. Stich, K. Terakura,
Role of Covalent Tip-Surface Interactions in Noncontact Atomic Force
Microscopy on Reactive Surfaces,
Phys. Rev. Lett. 78 (1997) 678.
http://www.msi.com/science/online/references/CASTEP_list/Abs/Perez.PRL_1997_78_678.html

R. Perez, M. C. Payne, A. D. Simpson,
First Principles Simulations of Silicon Nanoindentation,
Phys. Rev. Lett. 75 (1995) 4748.
http://www.msi.com/science/online/references/CASTEP_list/Abs/Perez.PRL_1995_75_4748.html

(a reasonably complete list of CASTEP publications is at 
http://www.msi.com/science/online/references/CASTEP_list/CASTEP_pubs.html)

Udo Becker has done a lot of AFM/STM modeling for surfaces of minerals,
using CRYSTAL (HF) (ubecker@uni-muenster.de), see
http://www.uni-muenster.de/Chemie/MI/people/becker/beckerpubl-e.html

Hope this helps

C.F. Matta wrote:
> 
> Hi everybody,
> 
> First:
>   I would much appreciate if you could point to me recent publications
> about modeling/computational studies of the interaction of the tip with
> the substrate in Atomic Force Microscopy (AFM) or/and Scanning Tunneling
> Microscopy (STM).
> 
> Second:
>   In STM, a typical separation from the tip to the substarte is 3-10 A,
> i.e. the tails of the wavefunctions of the tip and of the substrate are
> crucial. Gaussian functions are not behaving physically at long distances.
> Moreover, if the substrate consists of different atoms described with
> basis functions decaying at different rates, this will overemphasize the
> peacks due to the one decaying slower (the true wavefunction decays
> at a single rate).  The Linearized Augmented PlaneWave method (LAPW), due
> to Tersoff & Hamann, is supposed to remedy for this.
>         (1) Is there other methods better than LAPWD?
>         (2) Can one implement LAPWD in, say GAUSSIAN or GAMESS?
>         (3) If the answer to (2) is YES, then HOW?
>         (4) If NO, then what program(s) implements this method?
>         (5) Other suggestions?
> 
> Thank you all very much.  I will summarize.
> 
> Cherif
>  .......................................................................
>  Cherif F. Matta                        tel. (905) 525-9140 ext. 22502
>  Chemistry Department                   fax  (905) 522-2509
>  McMaster University
>  Hamilton, Ontario, CANADA L8S 4M1.
>  .......................................................................
> 
> -------This is added Automatically by the Software--------
> 
>             ****Posts to this newsgroup leave MSI's network****

-- 
===================================================================
Victor Milman             * Project Leader, Quantum Mechanics
Molecular Simulations Inc * tel: (01223) 413300
The Quorum                * fax: (01223) 413301
Barnwell Road             * tel. from abroad: +44 1223 413301
Cambridge CB5 8RE, UK     * e-mail: vmilman@msicam.co.uk
===================================================================


From chemistry-request@www.ccl.net  Mon Feb  8 12:47:17 1999
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Date: Mon, 8 Feb 1999 12:47:01 -0500 (EST)
From: Jasna Klicic <jasna@chem.columbia.edu>
To: Yongxing Liu <yliu@mail.wesleyan.edu>
cc: chemistry@www.ccl.net
Subject:  Re: CCL:Metal ion-water complex calculations 
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> Date: Fri, 05 Feb 1999 13:47:05 -0500  
> From: Yongxing Liu <yliu@mail.wesleyan.edu>
> To: chemistry@www.ccl.net
> Subject: CCL:Metal ion-water complex calculations
>
> Dear CCLers,
> 
> Would any one please point to me any references of ab initio,
> semiempirical, DFT calculations on metal ion-water complexes? The metal
> ions I am interested in are Na+, K+, Mg2+, Zn2+, Cl-, etc.
>
> Thanks a lot in advance.
>
> Sincerely,
> 
> Yongxing Liu
>
               
               
Dear Yongxing Liu,
   
There is an ab initio study of Zn(II)dithiophosphate by W. Goddard you
might be interested to see.  The reference is: 

Whaoyi Jiang et al, J. Phys. Chem. 1996, (100), p15760
   
Best regards,
   
Jasna
   
 
   ===============================================================
    Jasna J. Klicic, Ph.D.                 Schrodinger, Inc.
                                          One Exchange Place
    jasna@schrodinger.com                     Suite 604
     tel. (201) 433-2014 x104            Jersey City, NJ 07302    
     fax. (201) 433-2065               http://www.schrodinger.com 
   ===============================================================



From chemistry-request@www.ccl.net  Mon Feb  8 17:14:28 1999
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Subject: parameters for platinum
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Dear all:

I am looking for the software which includes the parameters of platinum(Pt)
for semiemperical calculations. Could you give me any suggestion? Thank you
very much.


Sincerely,

Jun Luo

From chemistry-request@www.ccl.net  Mon Feb  8 20:30:26 1999
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Subject: Re: CCL:periodic boundary conditions with DFT



   Date: Fri, 05 Feb 1999 09:38:14 -0500
   From: "Risser, Steve" <Rissers-C@BATTELLE.ORG>
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   Hi All

   Does anyone know of any existing DFT code that can perform calculations on
   periodic systems, explicitly including symmetry? 
   Thanks.

   Steve

Hi Steve,
You can do that with NWCHEM. I'm not sure there is any other code
available with this feature.
(see: http://www.emsl.pnl.gov:2080/docs/nwchem/nwchem.html)

From chemistry-request@www.ccl.net  Mon Feb  8 21:03:55 1999
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Steve,

You could do this with CASTEP (with symmetry)
   See  http://www.msi.com/solutions/products/cerius2/modules/castep.html#info
and DMol3 (with P1)
   See http://www.msi.com/solutions/products/cerius2/modules/dmol3.html#info

Cheers,

Noppawan


At 09:38 AM 2/5/99 -0500, Risser, Steve wrote:
>Hi All
>
>Does anyone know of any existing DFT code that can perform calculations on
>periodic systems, explicitly including symmetry? 
>Thanks.
>
>Steve
>
>----------------------------------------------------------------------------
>------------------------
>Dr. Steven M Risser
>	
>Current Year
>Associate Professor of Physics			Polymer Center
>Texas A&M University-Commerce		Battelle Memorial Institute
>Commerce TX 75429					505 King Avenue
>	
>Columbus, OH 43201-2693
>	
>(614) 424-3715
>----------------------------------------------------------------------------
>-----------------------
>
>
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>
>
>

*************************************
Noppawan Tanpipat, Ph.D.
Product Specialist, Quantum Chemistry
Molecular Simulations Inc.
9685 Scranton Road
San Diego, CA 92121

Tel: (619) 799-5332
Fax: (619) 458-0136
Email: nxt@msi.com


From chemistry-request@www.ccl.net  Mon Feb  8 21:18:39 1999
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Steve,

You could do this with CASTEP (with symmetry)
   See  http://www.msi.com/solutions/products/cerius2/modules/castep.html#info
and DMol3 (with P1)
   See http://www.msi.com/solutions/products/cerius2/modules/dmol3.html#info

Cheers,

Noppawan


At 09:38 AM 2/5/99 -0500, Risser, Steve wrote:
>Hi All
>
>Does anyone know of any existing DFT code that can perform calculations on
>periodic systems, explicitly including symmetry? 
>Thanks.
>
>Steve
>
>----------------------------------------------------------------------------
>------------------------
>Dr. Steven M Risser
>	
>Current Year
>Associate Professor of Physics			Polymer Center
>Texas A&M University-Commerce		Battelle Memorial Institute
>Commerce TX 75429					505 King Avenue
>	
>Columbus, OH 43201-2693
>	
>(614) 424-3715
>----------------------------------------------------------------------------
>-----------------------
>
>
>
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>



From chemistry-request@www.ccl.net  Mon Feb  8 22:53:28 1999
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Date: Tue, 09 Feb 1999 00:48:47
To: chemistry@www.ccl.net
From: "Dr. Daniel Glossman" <glossman@overnet.com.ar>
Subject: Bader's population analysis
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  Dear netters:

  Is there any program which is able to calculate (separately) the sigma
  and pi contributions to the total electronic charge within the context
  of a Bader's population analysis?

  Thamks in advance



					Daniel Glossman

					glossman@overnet.com.ar


From chemistry-request@www.ccl.net  Mon Feb  8 22:53:31 1999
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Date: Tue, 09 Feb 1999 00:49:27
To: chemistry@www.ccl.net
From: "Dr. Daniel Glossman" <glossman@overnet.com.ar>
Subject: Pop=Bonding calculation
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 Dear sirs:

 I have been doing some G94W calculations on several molecules with the
 POP=Bonding keyword, but I don't know how to do an interpretation of 
 the results and the Gaussian 94 manual is not very informative in this
 respect.

 For example, after the title "... Condensed to atoms (all electrons..."
 I got a symmetric matrix with diagonal elements equal to zero. 

 1) What do the numbers mean?
 2) Where do they come from?
 3) Are they related to the so called bond order analysis?
 4) Are there any bibliographic references for the calculation of these
    numbers?

 After that I got the total atomic charges. These charges are different
 from those coming from a traditional Mulliken population analysis in 
 that they are not summed up to the charge of the molecule under study.
 
 Again, 1) What do these charges mean?
 2) What's the meaning of the summation?
 3) Where do these numbers come from?
 4) which are the bibliographic references?


 Thanks in advance for a kind consideration of this request.

 Best regards



					Dr. Daniel Glossman

*****************************************************************************
 Universidad Nacional de Lujan
 Departamento de Ciencias Basicas	e-mail: glossman@overnet.com.ar
 Casilla de Correo 221			phone: (+54) 1 5533797
 (6700) Lujan				fax: (+54) 1 5539824
 Republica Argentina 

****************************************************************************
**


