Observation of multiphoton-laser-induced collisions

Area of Science:

• Atomic and Molecular Physics
• Quantum Optics
• Laser-Induced Chemistry

Background:

• Inelastic collisions involve energy transfer between colliding particles.
• Laser-induced processes offer precise control over atomic and molecular states.
• Multiphoton absorption allows excitation using multiple photons simultaneously.

Purpose of the Study:

• To report the first observation of a multiphoton-laser-induced inelastic collision.
• To investigate the simultaneous excitation of two ground-state atoms via photon absorption.
• To determine conditions maximizing collisional absorption.

Main Methods:

• Collisions between ground-state Barium (Ba) and Thallium (Tl) atoms were induced.
• A laser was used to deliver photons, facilitating multiphoton absorption.
• The energy of absorbed photons was tuned to match the excitation energy of the atoms.

Main Results:

• The study successfully observed a multiphoton-laser-induced inelastic collision.
• Two photons were absorbed, leading to the simultaneous excitation of both Ba and Tl atoms.
• Maximum collisional absorption occurred when the total photon energy equaled the sum of the excited atoms' energies at infinite separation.

Conclusions:

• Multiphoton laser-induced inelastic collisions are a viable phenomenon.
• This process enables simultaneous excitation of multiple atoms.
• Resonant energy matching is critical for maximizing such collisional events.