Cryogenic atomic hydrogen beam apparatus with velocity characterization.

Area of Science:

• Atomic Physics
• Spectroscopy
• Metrology

Background:

• Precision spectroscopy of hydrogen is crucial for fundamental physics tests.
• Uncertainty in atomic beam velocity distributions introduces systematic errors in spectroscopy.
• Existing methods for velocity distribution analysis can be complex and limited.

Purpose of the Study:

• To develop and present an apparatus for high signal-to-noise measurement of atomic hydrogen velocity distributions.
• To enable these measurements at cryogenic temperatures for both ground (1S) and metastable (2S) states.
• To investigate the impact of cryogenic nozzle geometry on velocity distributions.

Main Methods:

• Utilized a time-of-flight technique for velocity distribution measurement.
• Operated the apparatus at cryogenic temperatures.
• Employed a novel cryogenic nozzle geometry for hydrogen atom beam production.

Main Results:

• Achieved high signal-to-noise ratio for velocity distribution measurements.
• Demonstrated the capability to measure distributions for both 1S and 2S hydrogen.
• Observed effects of cryogenic nozzle geometry on the velocity distributions.

Conclusions:

• The developed apparatus provides a more accurate method for characterizing atomic hydrogen beams.
• This advancement can reduce systematic errors in precision spectroscopy.
• Further studies on nozzle geometry can optimize atomic beam properties for spectroscopy.