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Early Experiences with Computational Quantum Chemistry.

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Early computational quantum chemistry in the 1960s saw key advances. The first ethane internal rotation barrier and perturbed self-consistent-field applications were developed using mainframe computers.

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Area of Science:

  • Computational quantum chemistry
  • Theoretical chemistry
  • Molecular modeling

Background:

  • The early 1960s marked a nascent period for computational quantum chemistry, driven by the advent of mainframe computing.
  • Limited computational power and theoretical development posed significant challenges for early molecular calculations.

Purpose of the Study:

  • To chronicle the pioneering computational quantum chemistry research from the early 1960s.
  • To detail the first calculation of the internal rotation barrier in ethane.
  • To describe the initial molecular applications of perturbed self-consistent-field (SCF) equations.

Main Methods:

  • Utilized early mainframe computers for complex quantum chemical calculations.
  • Employed the self-consistent-field (SCF) method for electronic structure determination.
  • Applied perturbed SCF equations to investigate molecular properties.

Main Results:

  • Successfully computed the first barrier to internal rotation in ethane.
  • Demonstrated the first molecular application of perturbed SCF theory.
  • Documented the developmental challenges and successes of these early computational methods.

Conclusions:

  • The early 1960s laid the groundwork for modern computational quantum chemistry.
  • These foundational studies highlighted the potential of computational approaches in understanding molecular behavior.
  • The development of perturbed SCF methods opened new avenues for theoretical chemistry research.