A simple photoionization scheme for characterizing electron and ion spectrometers

Area of Science:

• Atomic, Molecular, and Optical Physics
• Spectroscopy
• Particle Physics

Background:

• Ion and electron imaging spectrometers require precise calibration for accurate data acquisition.
• Existing calibration methods can be complex or require specialized equipment.

Purpose of the Study:

• To develop a simple and effective photoionization scheme for generating spatially and energetically structured electron and ion beams.
• To provide a versatile tool for the off-line characterization and calibration of imaging spectrometers.

Main Methods:

• Utilizing a diode laser-based photoionization process.
• Employing a low-power (∼1 mW) passively stabilized diode laser.
• Using a low-flux effusive beam of potassium atoms.

Main Results:

• Generation of electrons and ions with well-defined spatial structures.
• Production of electron and ion beams with narrow energy spreads (≲2 eV).
• Demonstration of a simple implementation for spectrometer calibration.

Conclusions:

• The presented diode laser photoionization scheme offers a straightforward and efficient method for generating structured charged particle beams.
• This technique is highly suitable for the off-line calibration and characterization of ion and electron imaging spectrometers.
• The versatility and low resource requirements make it valuable for both research and educational applications.