Complex rovibrational dynamics of the Ar·NO⁺ complex.

Area of Science:

• Chemical Physics
• Quantum Mechanics
• Spectroscopy

Background:

• The Argon-Nitrosyl ion (Ar·NO+) is a van der Waals complex with limited experimental data on its intermonomer vibrational motion.
• Understanding the energy levels and dynamics of such complexes is crucial for molecular spectroscopy and theoretical chemistry.

Purpose of the Study:

• To compute and characterize the rotational-vibrational states of the Ar·NO+ complex across its dissociation energy.
• To interpret existing experimental results on the intermonomer vibrational motion of the Ar·NO+ complex.
• To identify and analyze bound, quasibound, and resonance states within the complex.

Main Methods:

• Variational nuclear motion computations were employed to determine bound-state energies and wave functions.
• Close-coupling scattering computations were utilized to investigate states above the dissociation energy.
• The HSLH potential energy surface was used for all calculations.

Main Results:

• The study computed rotational-vibrational states below, above, and well above the first dissociation energy (D0 = 887.0 cm-1).
• A total of 200 bound vibrational states were identified, providing insights into experimental observations.
• A significant number of long-lived quasibound states, embedded in the continuum, were found with energy structures similar to bound states.
• Short-lived resonance states were also identified and their properties analyzed.

Conclusions:

• The computed states provide a comprehensive understanding of the Ar·NO+ complex's dynamics.
• The findings facilitate the interpretation of scarce experimental data on the complex's vibrational motion.
• The identification of quasibound and resonance states expands the knowledge of complex dynamics beyond bound states.