Quantum wave packet dynamics of N(2D)+H2 reaction.

Area of Science:

• Quantum dynamics
• Chemical kinetics
• Computational chemistry

Background:

• Utilizes a recently reported ab initio potential energy surface for the electronic ground state (1(2)A(")) of the system.
• Employs the coupled state approximation to examine quantum wave packet dynamics.

Purpose of the Study:

• To report initial state-selected reaction probabilities, integral reaction cross sections, and thermal rate constants.
• To elucidate the insertion type mechanism for product formation.
• To calculate and analyze vibrational energy levels and spectral irregularities.

Main Methods:

• Quantum wave packet dynamics calculations.
• Coupled state approximation.
• Ab initio potential energy surface (1(2)A(")).
• Calculation of partial wave contributions up to J=55 for converged cross sections.
• Thermal rate constant calculations from reaction cross sections.
• Vibrational energy level calculations for NH(2) at J=0.
• Statistical analysis of energy level spacings.

Main Results:

• Converged integral reaction cross sections were obtained up to 1.0 eV collision energy.
• Calculated thermal rate constants show agreement with available theoretical and experimental data.
• Resonances and an insertion-type mechanism for product formation were identified.
• Vibrational energy levels of NH(2) were computed, and spectral irregularities were assessed.

Conclusions:

• The study provides a comprehensive quantum dynamical investigation of the title reaction.
• The findings offer detailed insights into reaction mechanisms, energy transfer, and spectral properties.
• The results contribute to a deeper understanding of chemical reactivity at the quantum level.