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Clean, robust alkali sources by intercalation within highly oriented pyrolytic graphite.

Rudolph N Kohn1, Matthew S Bigelow2, Mary Spanjers3

  • 1Space Dynamics Laboratory, Albuquerque, New Mexico 87106, USA.

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|April 9, 2020
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Summary
This summary is machine-generated.

New rubidium vapor dispensers using intercalated graphite (IHOPG) offer superior performance. These advanced dispensers hold more material, use less power, and produce fewer impurities than traditional salt dispensers.

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Area of Science:

  • Materials Science
  • Atomic Physics
  • Chemical Engineering

Background:

  • Rubidium vapor dispensers are crucial for applications in atomic clocks and precision measurements.
  • Current commercial dispensers, often based on chromate salts, have limitations in capacity, power consumption, and purity.

Purpose of the Study:

  • To develop and characterize novel rubidium vapor dispensers utilizing intercalated highly oriented pyrolytic graphite (IHOPG).
  • To compare the performance of IHOPG dispensers against conventional chromate salt dispensers.

Main Methods:

  • Fabrication of rubidium-intercalated HOPG (IHOPG) materials.
  • Characterization of IHOPG dispenser properties, including rubidium capacity, heating power requirements, and impurity emission.
  • Testing dispenser stability and atmospheric exposure tolerance.

Main Results:

  • IHOPG dispensers demonstrated an order of magnitude higher rubidium capacity compared to commercial dispensers.
  • They required less than one-fourth the heating power.
  • Impurity emission was reduced by more than half.
  • Processed IHOPG showed tolerance to atmospheric exposure for over 90 minutes.

Conclusions:

  • IHOPG dispensers represent a significant advancement over traditional rubidium vapor sources.
  • The demonstrated performance improvements suggest potential for widespread adoption in precision measurement applications.
  • The intercalation method is potentially applicable to other alkali metals like cesium, potassium, and lithium.