Dynamical processes in Rydberg-Stark deceleration and trapping of atoms and molecules

Area of Science:

• Atomic and Molecular Physics
• Quantum Mechanics
• Physical Chemistry

Background:

• Rydberg states, characterized by high principal quantum numbers, possess large electric dipole moments.
• Inhomogeneous electric fields interact strongly with these dipole moments, enabling manipulation of atomic and molecular trajectories.
• Efficient acceleration and deceleration of gas-phase atoms and molecules are crucial for controlled experiments.

Purpose of the Study:

• To demonstrate the deceleration of hydrogen atoms and molecules in supersonic beams to zero velocity using electric fields.
• To load decelerated atoms and molecules into electric traps for extended observation times.
• To investigate slow relaxation processes, photoionization, and Rydberg state transitions induced by blackbody radiation.

Main Methods:

• Utilized inhomogeneous electric fields to interact with the large electric dipole moments of Rydberg states.
• Employed supersonic beams to deliver hydrogen atoms and molecules at initial velocities of approximately 600 m/s.
• Implemented electrostatic trapping to confine decelerated atoms and molecules for long-duration studies.

Main Results:

• Successfully decelerated hydrogen atoms and molecules from supersonic beams to zero velocity.
• Achieved efficient loading of these atoms and molecules into electric traps.
• Observed photoionization and blackbody-radiation-induced Rydberg state transitions at temperatures from 10 K to 300 K over milliseconds.

Conclusions:

• Inhomogeneous electric fields provide an effective means for controlling Rydberg atom and molecule motion.
• Electrostatic trapping of Rydberg states allows for the study of slow dynamical processes.
• Collisional processes and blackbody-radiation-induced predissociation are significant in H2 Rydberg states.