Doppler-free/Doppler-sliced ion imaging

Area of Science:

• Atomic Physics
• Spectroscopy
• Ion Imaging

Background:

• Accurate detection and velocity measurement of atoms like hydrogen (H) and deuterium (D) are crucial in various atomic physics applications.
• Traditional Doppler-based methods often face limitations in achieving both high sensitivity and precise velocity resolution simultaneously.

Purpose of the Study:

• To demonstrate a novel hybrid ion imaging approach combining Doppler-free and Doppler-sliced techniques.
• To enable sensitive and high-resolution velocity measurements of H and D atoms.

Main Methods:

• Utilized a 2 + 1 resonant ionization scheme with nearly counterpropagating laser beams.
• Employed coplanar laser beams at a small angle to the detector, achieving Doppler selection along the time-of-flight axis and Doppler-free detection in the perpendicular plane.

Main Results:

• Achieved high signal levels for H and D atom detection.
• Demonstrated excellent velocity slicing with approximately 5% resolution.
• Confirmed that velocity resolution is primarily limited by cation recoil during ionization.

Conclusions:

• The hybrid Doppler-free/Doppler-sliced ion imaging technique is highly effective for H and D atom detection.
• The method provides superior velocity resolution, enabling detailed studies of atomic dynamics and interactions.