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wordsmithing and corrections
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9 changed files with 36 additions and 37 deletions
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@ -276,7 +276,7 @@ appropriate citation.
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Note that functionals; \verb+vwn_2+, \verb+vwn_3+, and \verb+vwn_4+
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require both sets of parameters (the Monte Carlo parameters of
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Ceperley and Alder and VWN's RPA parameters) used in fitting the
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homogenous electron gas correlation energy. Functionals
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homogeneous electron gas correlation energy. Functionals
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\verb+vwn_1+ and \verb+vwn_5+ require only the Monte Carlo fitting
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parameters. In order to reproduce results in the literature another
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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.
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This sub-directive specifies the name of the generated input to the
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{\em Insight} program. The name \verb+OUTPUT+ is reserved for the
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standard NWCHEM output.
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standard NWChem output.
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@ -60,7 +60,7 @@ be avoided.
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%Also, need to mention what added capability the second derivative
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%functionality will provide? Re angular momentum limits, are you saying
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%these limits will be removed when the functionality becomes available?
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%Finallly, say why Stuttgart ECPs should be avoided?--fmr.
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%Finally, say why Stuttgart ECPs should be avoided?--fmr.
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ECPs are named in the same fashion as geometries or regular basis
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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:
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\item If the entry for \verb+<tag>+ begins with either the symbol or
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name of an element (regardless of case), then the center is treated
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as an atom of that type. The default charge is the atomic number
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(adjusted for the presence of ECPsby the ECP \verb+NELEC+ directive
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(adjusted for the presence of ECPs by the ECP \verb+NELEC+ directive
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; see Section \ref{sec:ecp}). Additional characters can be added to
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the string, to distinguish between atoms of the same element (For
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example, the tags \verb+oxygen+, \verb+O+, \verb+o34+,
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@ -1385,7 +1385,7 @@ of processors.
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\item
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In rare events the amount of memory set aside per node is insufficient
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to hold all atomic coordinates assigned to that node. This leads to
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executation aborts with the message that {\tt mwm} or {\tt msa} is too
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execution which aborts with the message that {\tt mwm} or {\tt msa} is too
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small. Jobs may be restarted with additional space allocated by
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\begin{verbatim}
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extra <integer madbox>
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@ -28,7 +28,7 @@ wavefunctions.
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\subsection{subdirectives}
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Calculation of properties is accomplished via a call to
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TASK PROPERTY following the complition of an energy calculation.
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TASK PROPERTY following the completion of an energy calculation.
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Each property can be requested by means of a subdirective among
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the subdirectives provided :
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@ -65,7 +65,7 @@ used to store the Boys' localized molecular orbitals.
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Following the successful completion of an electronic structure
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calculation, a Natural Bond Orbital (NBO) analysis may be carried out
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in the following way. On restart specify the TASK as PROPERTY and
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supply the sub-directive NBOFILE to the PROPERTY directive. NWchem
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supply the sub-directive NBOFILE to the PROPERTY directive. NWChem
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will query the rtdb and construct an ASCII file,
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\verb+<file_prefix>.gen+, that may be used as input to the stand alone
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version of the NBO program, gennbo. \verb+<file_prefix>+ is equal to
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@ -1,4 +1,4 @@
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% $Id: qmmm.tex,v 1.5 1997-06-24 06:41:35 d3e129 Exp $
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% $Id: qmmm.tex,v 1.6 1997-06-27 08:58:35 d3e129 Exp $
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\label{sec:qmmm}
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@ -13,7 +13,7 @@ appropriate results\footnote{c.f., Singh and Kollman, J. Comp. Chem.
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Comp. Chem. {\bf 11}, 700, (1990); J. Gao, ``Methods and
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Applications of Combined Quantum Mechanical and Molecular Mechanical
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Potentials.'' In {\it Reviews in Computational Chemistry};
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K.~B.~Lipkowitz, D.~B.~Boyd, Eds.; VCH Publishers: New York, 199X;
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K.~B.~Lipkowitz, D.~B.~Boyd, Eds.; VCH Publishers: New York;
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Vol. 7, pp 119-185 (1995); and M. A. Thompson and G. K. Schenter, J.
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Phys. Chem {\bf 99} 6374 (1995) }.
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@ -741,9 +741,9 @@ cases.
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So why do things go wrong and what can be done to fix convergence
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problems? Most problems encountered so far arise either poor initial
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guesses or from small or negative eigenvalues of the orbital Hessian.
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The atomic orbital guess is usally very good. However, in
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The atomic orbital guess is usually very good. However, in
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calculations on charged systems, especially with open shells,
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incorrect initial occupations may result. The SCF might then coverge
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incorrect initial occupations may result. The SCF might then converge
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very slowly since very large orbital rotations might be required to
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achieve the correct occupation or move charge large distances in the
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molecule. Possible actions are
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@ -1,31 +1,30 @@
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The vibrational frequencies can be computed by finite difference for
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SCF and DFT wavefunctions currently. Drivers for other wavefunctions
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will be developed as required. The vibrational package was integrated
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from the Utah Messkit and can use any Hessian generated from the
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driver routines.
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% $Id: vib.tex,v 1.7 1997-06-27 08:58:41 d3e129 Exp $
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{\it The input module for vib is under development and incomplete.}
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The nuclear hessian which is used to compute the vibrational
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frequencies can be computed by finite difference for any ab initio
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wavefunction that has analytic gradients. An analytic nuclear hessian
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is available only for SCF. The appropriate nuclear hessian generation
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algorithm is chosen based on the user input when \verb+TASK <theory>
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frequencies+ is the task directive.
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\section{Project out translations and rotations}
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The vibrational package was integrated from the Utah Messkit and can
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use any nuclear hessian generated from the driver routines. There is
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no required input for the ``VIB'' package. VIB computes the
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frequencies and intensities\footnote{Intensities are only computed if
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the dipole derivatives are available; these are computed by default
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for most methods that use the finite difference driver routines} for
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for the comptued nuclear hessian and the ``projected'' nuclear
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hessian. The VIB module projects out the translations and rotations
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of the nuclear hessian using the standard Eckart projection algorithm.
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The VIB module also computes the zero point energy for the molecular
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system based on the frequencies obtained from the projected hessian.
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The VIB module can project out the translations and rotations of the
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Hessian using the standard Eckart projection algorithm. To set this
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option you must enter the following in your input deck.
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The default mass of each atom is used unless an alternative mass is
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provided via the geometry input, (c.f., \ref{sec:geom}). The default
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mass is the mass of the most abundant isotope of each
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element.\footnote{c.f., "The Elements" by John Emsley, Oxford
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University Press, (C) 1989, ISBN 0-19-855237-8.} When the abundance
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was roughly equal the mass of the isotope with the longest half life
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was used.
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\begin{verbatim}
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set "vib:project" true
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\end{verbatim}
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\section{Zero point energy}
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The VIB module can also compute the zero point energy for the
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molecular system. This will automatically set the projection flag to
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remove the translations and rotations. To compute the zero point energy
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you must enter the following in your input deck.
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\begin{verbatim}
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set "vib:zero point energy" logical true
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\end{verbatim}
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Note: the mass of each atom is set via the geometry input, (c.f.,
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\ref{sec:geom}).
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