If you are still running , you are likely in one of two camps: a computational chemist clinging to a validated workflow, or a graduate student forced to use the license dongle from 2014 that refuses to die.
: The update added support for CM5 atomic charges alongside Hirshfeld charges. Common Applications
The "W" in Gaussian 09W implies a focus on the Windows user experience. This version was designed to work in tandem with , the graphical user interface (GUI). Posts tagged Gaussian 09W 9.5 Revision D.01 Off...
By the time Revision D.01 was released, Gaussian 09 had undergone extensive field testing through previous revisions (A, B, and C). Revision D.01 represented a mature, highly optimized version of the code. For researchers publishing papers, stability is paramount. A calculation that crashes midway through due to a memory leak or an algorithmic error costs valuable time. Revision D.01 was widely regarded as the "gold standard" for stability during the G09 era, ensuring that long-duration calculations (such as Transition State searches or ONIOM calculations) ran reliably.
Gaussian 09W was designed for the transition period between single-core and multi-core CPUs. Rev D.01 has a known flaw regarding %nprocshared . Posts tagged often include error logs stating: "Unable to offload to shared memory. Parallelization disabled." If you are still running , you are
: Features such as SCF=YQC and SCF=Big were introduced to improve convergence in difficult cases and speed up calculations for very large molecules (over 5,000 basis functions).
You might ask: Why not move to Gaussian 16 or Gaussian 20? The answer lies in . In computational chemistry, changing software versions alters results by a fraction of a kcal/mol—enough to reject or accept a paper. This version was designed to work in tandem
. Released in 2013, this revision introduces several performance enhancements and new keyword functionalities to improve the accuracy and flexibility of molecular modeling. 理工メディアセンター Key Features of Revision D.01
