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Stabilization and relative phase effects in a dichromatically driven diatomic Morse molecule: interpretation based on
Vassilios Constantoudis1, Cleanthes A Nicolaides
1Physics Department, National Technical University and Institute of Microelectronics, NCSR "Demokritos" Aghia Paraskevi, 15310 Athens, Greece. vconst@imel.demokritos.gr
The Journal of Chemical Physics
|April 20, 2005
Summary
Investigating laser-driven molecule dissociation, this study reveals phase-dependent dissociation probabilities. Adding a second laser stabilizes the molecule, a "chemical bond hardening" effect influenced by laser phase and intensity.
Area of Science:
- * Chemical Physics
- * Nonlinear Dynamics
- * Molecular Spectroscopy
Background:
- * Understanding molecular dissociation dynamics is crucial for controlling chemical reactions.
- * Laser-matter interactions offer precise control over molecular behavior.
- * Previous studies explored single laser dissociation; the role of multiple lasers and their phases remains less understood.
Purpose of the Study:
- * To investigate the dissociation dynamics of a diatomic Morse molecule driven by two lasers.
- * To analyze the influence of the relative phase (phi) between the two laser fields on dissociation probability.
- * To explore the phenomenon of molecular stabilization and its dependence on laser parameters and phase space topology.
Main Methods:
- * Application of nonlinear theory tools from classical Hamiltonian systems.
- * Analysis of phase space topology modifications under bichromatic laser driving.
- * Investigation of stability islands and Kolmogorov-Arnold-Moser (KAM) tori survival.
Main Results:
- * Dissociation probability is dependent on the relative phase (phi) of the two laser fields, mirroring quantum mechanical observations.
- * A second laser suppresses dissociation probability (stabilization) when the first laser's intensity is near the single-laser dissociation threshold.
- * This stabilization effect, termed
- chemical bond hardening
- diminishes as phi increases and is linked to phase space topology changes, including the appearance/disappearance of stability islands and deformation of KAM tori.
Conclusions:
- * The relative phase of bichromatic laser fields significantly impacts molecular dissociation dynamics.
- * Dual-laser irradiation can induce molecular stabilization, offering a method for
- chemical bond hardening
- .
- * Phase space topology is a key factor in understanding laser-induced molecular stabilization and phase dependence, with short pulses enhancing these effects.