wordsmithing and corrections

This commit is contained in:
Ricky Kendall 1997-06-27 08:59:52 +00:00
parent d20bd42917
commit 8f1ce3cc16
9 changed files with 36 additions and 37 deletions

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@ -276,7 +276,7 @@ appropriate citation.
Note that functionals; \verb+vwn_2+, \verb+vwn_3+, and \verb+vwn_4+
require both sets of parameters (the Monte Carlo parameters of
Ceperley and Alder and VWN's RPA parameters) used in fitting the
homogenous electron gas correlation energy. Functionals
homogeneous electron gas correlation energy. Functionals
\verb+vwn_1+ and \verb+vwn_5+ require only the Monte Carlo fitting
parameters. In order to reproduce results in the literature another
functional was added; the \verb+vwn_1_rpa+. This is the original

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@ -58,7 +58,7 @@ $\alpha$ and $\beta$ electron densities.
This sub-directive specifies the name of the generated input to the
{\em Insight} program. The name \verb+OUTPUT+ is reserved for the
standard NWCHEM output.
standard NWChem output.

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@ -60,7 +60,7 @@ be avoided.
%Also, need to mention what added capability the second derivative
%functionality will provide? Re angular momentum limits, are you saying
%these limits will be removed when the functionality becomes available?
%Finallly, say why Stuttgart ECPs should be avoided?--fmr.
%Finally, say why Stuttgart ECPs should be avoided?--fmr.
ECPs are named in the same fashion as geometries or regular basis
sets, with the default name being \verb+"ecp basis"+. It should be

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@ -224,7 +224,7 @@ and is interpreted as follows:
\item If the entry for \verb+<tag>+ begins with either the symbol or
name of an element (regardless of case), then the center is treated
as an atom of that type. The default charge is the atomic number
(adjusted for the presence of ECPsby the ECP \verb+NELEC+ directive
(adjusted for the presence of ECPs by the ECP \verb+NELEC+ directive
; see Section \ref{sec:ecp}). Additional characters can be added to
the string, to distinguish between atoms of the same element (For
example, the tags \verb+oxygen+, \verb+O+, \verb+o34+,

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@ -1385,7 +1385,7 @@ of processors.
\item
In rare events the amount of memory set aside per node is insufficient
to hold all atomic coordinates assigned to that node. This leads to
executation aborts with the message that {\tt mwm} or {\tt msa} is too
execution which aborts with the message that {\tt mwm} or {\tt msa} is too
small. Jobs may be restarted with additional space allocated by
\begin{verbatim}
extra <integer madbox>

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@ -28,7 +28,7 @@ wavefunctions.
\subsection{subdirectives}
Calculation of properties is accomplished via a call to
TASK PROPERTY following the complition of an energy calculation.
TASK PROPERTY following the completion of an energy calculation.
Each property can be requested by means of a subdirective among
the subdirectives provided :
@ -65,7 +65,7 @@ used to store the Boys' localized molecular orbitals.
Following the successful completion of an electronic structure
calculation, a Natural Bond Orbital (NBO) analysis may be carried out
in the following way. On restart specify the TASK as PROPERTY and
supply the sub-directive NBOFILE to the PROPERTY directive. NWchem
supply the sub-directive NBOFILE to the PROPERTY directive. NWChem
will query the rtdb and construct an ASCII file,
\verb+<file_prefix>.gen+, that may be used as input to the stand alone
version of the NBO program, gennbo. \verb+<file_prefix>+ is equal to

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@ -1,4 +1,4 @@
% $Id: qmmm.tex,v 1.5 1997-06-24 06:41:35 d3e129 Exp $
% $Id: qmmm.tex,v 1.6 1997-06-27 08:58:35 d3e129 Exp $
\label{sec:qmmm}
@ -13,7 +13,7 @@ appropriate results\footnote{c.f., Singh and Kollman, J. Comp. Chem.
Comp. Chem. {\bf 11}, 700, (1990); J. Gao, ``Methods and
Applications of Combined Quantum Mechanical and Molecular Mechanical
Potentials.'' In {\it Reviews in Computational Chemistry};
K.~B.~Lipkowitz, D.~B.~Boyd, Eds.; VCH Publishers: New York, 199X;
K.~B.~Lipkowitz, D.~B.~Boyd, Eds.; VCH Publishers: New York;
Vol. 7, pp 119-185 (1995); and M. A. Thompson and G. K. Schenter, J.
Phys. Chem {\bf 99} 6374 (1995) }.

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@ -741,9 +741,9 @@ cases.
So why do things go wrong and what can be done to fix convergence
problems? Most problems encountered so far arise either poor initial
guesses or from small or negative eigenvalues of the orbital Hessian.
The atomic orbital guess is usally very good. However, in
The atomic orbital guess is usually very good. However, in
calculations on charged systems, especially with open shells,
incorrect initial occupations may result. The SCF might then coverge
incorrect initial occupations may result. The SCF might then converge
very slowly since very large orbital rotations might be required to
achieve the correct occupation or move charge large distances in the
molecule. Possible actions are

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@ -1,31 +1,30 @@
The vibrational frequencies can be computed by finite difference for
SCF and DFT wavefunctions currently. Drivers for other wavefunctions
will be developed as required. The vibrational package was integrated
from the Utah Messkit and can use any Hessian generated from the
driver routines.
% $Id: vib.tex,v 1.7 1997-06-27 08:58:41 d3e129 Exp $
{\it The input module for vib is under development and incomplete.}
The nuclear hessian which is used to compute the vibrational
frequencies can be computed by finite difference for any ab initio
wavefunction that has analytic gradients. An analytic nuclear hessian
is available only for SCF. The appropriate nuclear hessian generation
algorithm is chosen based on the user input when \verb+TASK <theory>
frequencies+ is the task directive.
\section{Project out translations and rotations}
The vibrational package was integrated from the Utah Messkit and can
use any nuclear hessian generated from the driver routines. There is
no required input for the ``VIB'' package. VIB computes the
frequencies and intensities\footnote{Intensities are only computed if
the dipole derivatives are available; these are computed by default
for most methods that use the finite difference driver routines} for
for the comptued nuclear hessian and the ``projected'' nuclear
hessian. The VIB module projects out the translations and rotations
of the nuclear hessian using the standard Eckart projection algorithm.
The VIB module also computes the zero point energy for the molecular
system based on the frequencies obtained from the projected hessian.
The VIB module can project out the translations and rotations of the
Hessian using the standard Eckart projection algorithm. To set this
option you must enter the following in your input deck.
The default mass of each atom is used unless an alternative mass is
provided via the geometry input, (c.f., \ref{sec:geom}). The default
mass is the mass of the most abundant isotope of each
element.\footnote{c.f., "The Elements" by John Emsley, Oxford
University Press, (C) 1989, ISBN 0-19-855237-8.} When the abundance
was roughly equal the mass of the isotope with the longest half life
was used.
\begin{verbatim}
set "vib:project" true
\end{verbatim}
\section{Zero point energy}
The VIB module can also compute the zero point energy for the
molecular system. This will automatically set the projection flag to
remove the translations and rotations. To compute the zero point energy
you must enter the following in your input deck.
\begin{verbatim}
set "vib:zero point energy" logical true
\end{verbatim}
Note: the mass of each atom is set via the geometry input, (c.f.,
\ref{sec:geom}).