From chemistry-request@ccl.net Mon Aug  4 08:40:54 2003
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Date: Mon, 4 Aug 2003 13:41:08 +0100 (BST)
From: "M.T.Storr" <m.t.storr[at]reading.ac.uk>
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To: chemistry[at]ccl.net
Subject: CCL: g03 Error Message
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Hi,

I am trying to run a g03 calculation and keep getting the following error 
message.


<S**2> of initial guess= 2.0000
NB too large for integers on this machine.
Error termination via Lnk1e in /prod/codes/castep/gaussian/g03/l508.exe at
Fri Aug  1 22:55:04 2003.
Job cpu time:  0 days  8 hours 14 minutes 31.8 seconds.
File lengths (MBytes):  RWF=     25 Int=      0 D2E=      0 Chk=      1
Scr=      1

I was wondering if anyone had come across this error before and if so 
could you please explain the rpoblem.

Many Thanks

Mark


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Dr. Mark T. Storr
School of Chemistry
University of Reading
PO Box 224
Whiteknights
Reading
Berkshire
RG6 6AD

E-mail: M.T.Storr[at]reading.ac.uk
Tel: +44 (0)118 9875123 Ext. 7415
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


From chemistry-request@ccl.net Mon Aug  4 06:07:14 2003
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Date: Mon, 04 Aug 2003 11:06:46 +0100
From: "Donald Folami" <paxdof<<at>>nottingham.ac.uk>
To: <chemistry<<at>>ccl.net>
Subject: Waterbox generation in CHARMM
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I'm new to CHARMM, so pls indulge me.
I have a few TIP3 water CRD files and I'm trying to generate a box (66x44x62angstroms)with periodic boundary conditions. Can anyone pls help me with the scripting this might involve?
Thank you so very much for your time,
Donald Folami.

___________________________________________________
Donald O. Folami
Computational Modelling and Informatics Group
Institute of Pharmaceutical Sciences
University of Nottingham
University Park
Nottingham
NG7 2RD
UK.

Email:   paxdof<<at>>nottingham.ac.uk
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From chemistry-request@ccl.net Sun Aug  3 22:34:13 2003
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From: "David Miller" <dmiller<<at>>sageinformatics.com>
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Subject: Free software: ChemTK Lite
Date: Sun, 3 Aug 2003 20:36:00 -0600
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ChemTK Lite is a free Windows toolkit providing chemists the ability
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Derived from ChemTK version 2.6, which now features MCS generation,
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David W. Miller, Ph.D.
Sage Informatics LLC
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From chemistry-request@ccl.net Mon Aug  4 11:21:10 2003
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Accelrys Inc. are holding the following training workshops at locations in 
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Introduction to Materials Studio
8th October 2003, San Diego, CA

Introduction to Polymer Modeling using Materials Studio
9th b   10th October 2003, San Diego, CA

Introduction to Materials Studio
21st October 2003, Cambridge, UK

Introduction to Polymer Modeling using Materials Studio
22nd b   23rd October 2003, Cambridge, UK

Workshop on Structure Solution from Powder Diffraction Data
24th October 2003, Cambridge, UK

For course details and registration see: 
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Macromolecular Modeling:

Introduction to Life Science Modeling with InsightII
7th b   8th October 2003, Burlington, MA

Homology Base Protein Design
9th b   10th October 2003, Burlington, MA

Biomolecular NMR: Processing and Analysis
13th b   14th October 2003, Cambridge, UK

Biomolecular NMR: Structure Determination
15th b   16th October 2003, Cambridge, UK

Structure Based Drug Design with InsightII
20th b  21st October 2003, San Diego, CA

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22nd b  23rd October 2003, San Diego, CA

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Cambridge CB4 0WN UK

Telephone number: +44 (0) 1223 228691
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Web: http://www.accelrys.com


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Jeffrey L. Nauss, Ph.D.
Manager, Discovery Studio Training

Accelrys Inc.
9685 Scranton Road
San Diego, CA 92121-3752

Phone: 858-799-5555
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http://www.accelrys.com/training




From chemistry-request@ccl.net Mon Aug  4 13:56:10 2003
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Date: Mon, 4 Aug 2003 19:56:12 +0200 (CEST)
From: Rupert Mazzucco <maz*at*ap.univie.ac.at>
To: chemistry*at*ccl.net
Subject: photoreaction with g03?
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Hi,

in an attempt to better understand an optical absorption spectrum
we have measured, I'd like to simulate the photodecay of DMPA
(2,2-dimethoxy-2-phenylacetophenone, C16O3H16, common photoinitiator
for free radical polymerisation) with Gaussian 03.  I have no
prior experience with Gaussian, other than playing around with it
for two weeks and trying some of the examples in this introductory
book that comes with it (and I'm not even chemist, but physicist),
so I'd be glad for any help.

A paper I've found explains the reaction as follows:  The molecule
in its (singlet) ground state absorbs a photon and goes into an
excited singlet state, which decays into a triplet state by "intersystem
crossing"; then the C-C bond in the middle of the molecule breaks and
leaves two radicals.  (Then there is a photoinduced follow-up reaction,
but that one is for later.)  I want to calculate all the states that
occur in that reaction.

So (after an initial geometry optimisation, tried different methods
which give nearly identical results) I'm using the RCIS method to get
singlet and triplet excited states, restricted shell because the
ground state is a singlet (right?).  I've been advised to use a **
basis set because of the oxygens, and the manual says to use diffuse
base functions, so I'm going with 6-31+G(p,d) for now.  Then  I'll try
to locate an excited singlet state that corresponds roughly to the photon
energy as well as the triplet state below it, and do a OPT FREQ on them.

Does that sound like a good plan so far?  There is also the TD method,
which seems to serve a similar purpose.  Maybe I'll try that later.

The manual says that excited state calculations are not very accurate.
What accuracy can I expect, how far will energies be off, roughly?

Thanks for any input.

Best regards,
Rupert Mazzucco
maz*at*ap.univie.ac.at



