What Are the Applications of Quantum Mechanics in Chemistry?

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SUMMARY

The discussion focuses on the applications of quantum mechanics in chemistry, specifically the use of the Schrödinger equation to determine molecular orbital diagrams and predict chemical reactions. Participants emphasize the importance of quantum chemistry, particularly methods like Hartree-Fock and density functional theory (DFT), in calculating molecular properties and reaction dynamics. The conversation highlights the challenges of applying quantum mechanics to complex systems, such as mixtures, and the necessity of approximations due to computational limitations.

PREREQUISITES
  • Understanding of the Schrödinger equation in quantum mechanics
  • Familiarity with molecular orbital theory and Hartree-Fock methods
  • Knowledge of density functional theory (DFT) for many-body interactions
  • Basic concepts of quantum chemistry and electronic structure theory
NEXT STEPS
  • Research "Molecular electronic structure theory" by Helgaker, Jørgensen, and Olsen for in-depth understanding
  • Explore advanced quantum chemistry textbooks focusing on Hartree-Fock and DFT methods
  • Investigate computational techniques for predicting properties of mixtures using quantum mechanics
  • Learn about path integral quantum mechanics and its applications in chemical problems
USEFUL FOR

Chemists, quantum physicists, and researchers in theoretical chemistry seeking to understand the intersection of quantum mechanics and chemical properties, particularly in molecular modeling and reaction prediction.

  • #31
Big-Daddy said:
I've read the page you linked on the Born-Oppenheimer approximation. However, I'm still confused as to what you mean by "molecular structure and isomers have no meaning at a fully quantum mechanical level" - surely there must be something to distinguish isomers from each other at the most fundamental level, since they are indeed different species and we can isolate them separately from one another in the lab?

Isomers can isomerize. On a most fundamental level, the eigenstates of the full hamiltonian are superpositions of different isomers.
The question why we really observe isomers is far from trivial. Probably it is due to interactions with neighbouring molecules, so it is a colligative effect. You may want to google for Hund's paradox.
 
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  • #32
DrDu said:
Isomers can isomerize. On a most fundamental level, the eigenstates of the full hamiltonian are superpositions of different isomers.
The question why we really observe isomers is far from trivial. Probably it is due to interactions with neighbouring molecules, so it is a colligative effect. You may want to google for Hund's paradox.

Doesn't Hund's paradox just apply to chiral systems? I thought his question was more about non-degenerate isomers (boat versus chair and all that).
 
  • #33
Einstein Mcfly said:
Doesn't Hund's paradox just apply to chiral systems? I thought his question was more about non-degenerate isomers (boat versus chair and all that).

Yes, but as always, for degenerate states the consideration of superpositions is most relevant.
 

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