Molecular vibrational trapping revisited: a case study with D2

Area of Science:

• Physical Chemistry
• Quantum Mechanics
• Molecular Spectroscopy

Background:

• Vibrational trapping, or bond hardening, is a known phenomenon in small molecules exposed to intense laser fields.
• It is theoretically predicted by the dressed state representation, involving light-induced vibrational levels.
• Previous understanding focused on energy level coincidence and maximizing wave function overlap.

Purpose of the Study:

• To quantitatively investigate vibrational trapping in molecules like H2 under intense laser fields.
• To explore the role of field-free vibrational wave function structure in the trapping phenomenon.
• To calculate photodissociation probabilities across a range of photon energies.

Main Methods:

• Theoretical study employing a dressed state representation.
• One-dimensional numerical simulations.
• Calculation of photodissociation probabilities for varying photon energies.

Main Results:

• Confirmed the phenomenon of vibrational trapping in intense laser fields.
• Demonstrated that the nodal structure of field-free vibrational wave functions significantly influences vibrational trapping.
• Photodissociation probabilities were calculated for a wide range of photon energies.

Conclusions:

• The nodal structure of field-free vibrational wave functions is a critical factor in vibrational trapping.
• This finding adds a new dimension to the understanding of light-matter interactions in molecules.
• The study provides quantitative insights into photodissociation dynamics under intense laser irradiation.