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Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
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A compact and highly collimated atomic/molecular beam source.

Geetika Bhardwaj1, Saurabh Kumar Singh1, Pranav R Shirhatti1

  • 1Tata Institute of Fundamental Research Hyderabad, 36/P Gopanpally, Hyderabad 500046, Telangana, India.

The Review of Scientific Instruments
|December 11, 2023
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Summary
This summary is machine-generated.

Researchers developed a compact atomic beam source using a segmented capillary design. This innovative Helium beam source achieves high collimation, enabling precise surface monitoring applications.

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Area of Science:

  • Atomic and Molecular Physics
  • Surface Science
  • Materials Science

Background:

  • Developing precise atomic and molecular beam sources is crucial for advanced surface characterization.
  • Existing sources often lack the desired collimation or compactness for specific applications.

Purpose of the Study:

  • To design, characterize, and demonstrate the application of a novel, compact, and highly collimated atomic/molecular beam source.
  • To investigate the effectiveness of a segmented capillary design for beam collimation.

Main Methods:

  • Construction of a segmented capillary beam source using a syringe needle.
  • Angular width measurements of the generated Helium beam.
  • Free molecular flow simulations to analyze beam characteristics.
  • Application in monitoring real-time surface coverage changes on a Cu(110) surface exposed to oxygen via specular reflectivity measurements.

Main Results:

  • The segmented capillary design effectively suppresses off-axis trajectories, resulting in a narrow Helium beam with a full width half maximum of 7 mrad.
  • The source is demonstrated to be suitable for real-time monitoring of surface coverage.
  • Specular reflectivity measurements using the Helium beam provided insights into surface changes.

Conclusions:

  • The developed segmented capillary atomic/molecular beam source offers a simple, compact, and highly collimated solution.
  • This source is effective for precise surface science studies, including real-time monitoring of surface coverage.
  • The design represents a significant advancement for applications requiring narrow atomic beams.