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An Open-Source Normothermic Perfusion System Designed for Research Scientists

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Restricted-Open-Shell G4(MP2)-Type Procedures.

Bun Chan¹, Amir Karton², Krishnan Raghavachari³

¹Graduate School of Engineering, Nagasaki University , Bunkyo 1-14, Nagasaki 852-8521, Japan.

The Journal of Physical Chemistry. A

|December 10, 2016

Summary

This summary is machine-generated.

New restricted-open-shell (RO) G4(MP2) and G4(MP2)-6X methods offer comparable performance to unrestricted variants for computational chemistry. These ROG4 methods provide broader software compatibility, enhancing their practical utility.

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Area of Science:

Computational chemistry
Quantum chemistry
Theoretical chemistry

Background:

The G4(MP2) and G4(MP2)-6X computational procedures are established methods for calculating molecular energies.
Unrestricted (U) formalisms can present limitations in software compatibility and application scope.
Restricted-open-shell (RO) formalisms offer potential advantages in computational efficiency and broader applicability.

Purpose of the Study:

To reformulate the G4(MP2) and G4(MP2)-6X procedures using a restricted-open-shell (RO) formalism.
To evaluate the performance of the new ROG4(MP2) and ROG4(MP2)-6X methods, particularly for radical species.
To highlight the practical advantages of the RO variants in terms of software accessibility.

Main Methods:

Reformulation of G4(MP2) and G4(MP2)-6X procedures into restricted-open-shell (RO) variants.
Comparative performance analysis of ROG4(MP2)/ROG4(MP2)-6X against their unrestricted (U) counterparts.
Application of ROG4(MP2)-6X to a large-scale computation of dodecahedryl dimer dissociation.

Main Results:

The ROG4(MP2) and ROG4(MP2)-6X procedures demonstrate performance comparable to the original unrestricted (U) variants.
The inclusion of empirical parameters in the RO methods compensates for any slight performance differences compared to U variants.
ROG4(MP2) and ROG4(MP2)-6X exhibit significantly wider compatibility with computational chemistry software packages.

Conclusions:

The developed ROG4(MP2) and ROG4(MP2)-6X methods provide a robust and practical alternative to existing computational procedures.
The enhanced software compatibility of ROG4 methods broadens their applicability in diverse computational chemistry studies.
These findings underscore the utility of RO formalisms for advancing theoretical chemical calculations.