Time evolution of natural orbitals in ab initio molecular dynamics

Area of Science:

• Quantum Chemistry
• Computational Chemistry
• Chemical Dynamics

Background:

• Accurate simulation of electronic structure dynamics is crucial for understanding chemical reactions.
• Existing methods often struggle to capture real-time electronic evolution in complex systems.

Purpose of the Study:

• To develop and validate a new computational approach, Global Natural Orbital Functional ab initio Molecular Dynamics (GNOF-AIMD).
• To investigate the real-time electronic structure evolution during reactive collisions.

Main Methods:

• Combining ab initio molecular dynamics (AIMD) with Global Natural Orbital Functionals (GNOF).
• Utilizing the Born-Oppenheimer approximation.
• Simulating the quartet ground-state reaction N(4S) + H2(1Σ) → NH(3Σ) + H(2S) as a test case.

Main Results:

• GNOF-AIMD successfully displays the real-time evolution of natural orbitals.
• The method provides detailed insights into time-dependent electronic structure.
• Collision energy effects on integral cross sections and product rotational distributions were analyzed.

Conclusions:

• GNOF-AIMD is a promising new tool for studying the electronic dynamics of chemical processes.
• The approach shows good agreement with high-quality theoretical results, validating its accuracy.
• This method offers enhanced understanding of reactive collisions and electronic structure.