Quantum chemistry

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Quantum chemistry


Quantum chemistry is a branch of chemistry focused on the application of quantum mechanics and experiments of chemical systems in physical models. Interpretation of electronic structure and molecular dynamics using the Schrödinger & Single-particle equations are crucial concepts in quantum chemistry. 

Quantum chemistry is defined with a unique branch of molecular quantum mechanics. Single-particle orbitals carry out the self-consistent & single-particle equations in quantum chemistry. 

Majorly quantum chemistry is defined in two types: 

  • Experimental quantum chemists depend deliberately on spectroscopy, through which information related to the quantization of energy on a molecular scale prevails. 

  • Theoretical quantum chemistry is categorized under computational chemistry intended to predict quantum theory atoms and molecules through discrete energies. 

  •  Overlapping of quantum chemistry and material science may lead to the development of quantum computers. 

Electronic structure : 


The electronic structure of the molecule plays a vital role in resolving the quantum chemical problems of the Schrodinger equation through electronic molecular Hamiltonian. 

Key concepts in electronic structure: 

  •  The valence bond's foremost duty enables pairwise interactions among atoms and correlates closely with classical chemist bonds. 

Merging of atomic orbitals with chemical bonds leads to orbit hybridization and resonance. 

  • The molecular orbital approach is capable of predicting spectroscopic properties keenly than the valence bond method. 

  •  Density functional theory is capable of providing accurate quantum chemistry calculations accurately. 

Chemical dynamics: 




They are classified into 2 types:

  • Adiabatic chemical dynamics interprets the single scalar potentials among interatomic interactions known as potential energy surfaces. They are proficient in the estimation of unimolecular reaction rates. 

  • Non-adiabatic chemical dynamics are responsible for the interaction of coupled potential energy surfaces in terms of vibronic coupling. 

Applications of quantum chemistry : 






  •  Molecular mechanics depends on classical physics and force-field parameters with embedded empirical. 

  •  The semi-empirical mechanism relies on quantum physics to derive empirical parameter approximation extensively. 

  •  Drug design software. 

  •  The energy of a reaction. 

  • IR spectra. 

  •  Density functional theory.

  • Wave function methods. 



Quantum chemistry has demonstrated that it is capable of delivering outstanding support to experimental spectroscopy and advanced in deriving the observed spectral patterns keenly. This has been vastly acknowledged for decades precedently for IR and Raman spectroscopies . 
In the case of NIR spectroscopy, it is quite distinct because most published reports are bound to selected NIR bands, mostly overtones.Extensive theoretical investigations of entire NIR spectra remain very sparse. 
The cause should be well defined and contemplated vastly with the increased complexity of the theoretical designation of anharmonic effects. These effects are essential in NIR spectroscopy and thus involve complex approaches imperatively. 
Simultaneously IR and Raman spectroscopies, which anticipate the bands originating from fundamental modes, may reckon on a simple harmonic oscillator model as the stand for theoretical studies.

There exists a zillion applications of quantum computing and this is one of the most powerful ones.


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