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Simplest molecules as candidates for precise optical clocks.

S Schiller1, D Bakalov2, V I Korobov3

  • 1Institut für Experimentalphysik, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany.

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|July 26, 2014
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Summary
This summary is machine-generated.

Precise molecular transition frequencies are key for fundamental physics. Researchers identified hydrogen molecular ions (H2+) and HD+ for ultra-accurate measurements, reaching uncertainties in the 10(-18) range.

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Area of Science:

  • Atomic and Molecular Physics
  • Quantum Chemistry
  • Metrology

Background:

  • Precise measurement of transition frequencies in cold, trapped molecules is crucial for fundamental physics research.
  • High accuracy is desirable for exploring subtle physical phenomena and testing theories.
  • Simple molecules with a single electron are ideal candidates due to calculable external-field corrections.

Purpose of the Study:

  • To identify simple molecular candidates for precise transition frequency measurements.
  • To theoretically calculate external-field shift corrections for high-precision spectroscopy.
  • To develop methods for reducing systematic uncertainties in molecular transition frequencies.

Main Methods:

  • Theoretical calculation of external-field shift corrections for single-electron molecules.
  • Identification of specific transitions in H(2)(+) with potential for high precision.
  • Generalization of the composite frequency method for systematic shift cancellation.
  • Application of composite frequencies to HD(+) for uncertainty reduction.

Main Results:

  • H(2)(+) exhibits transitions with fractional systematic uncertainties reducible to 5×10(-17) at room temperature.
  • The composite frequency method creates tailored linear combinations of transition frequencies.
  • These composite frequencies are independent of external perturbing field strengths.
  • Uncertainty for composite frequencies in HD(+) reaches the 10(-18) range.

Conclusions:

  • Simple molecular ions like H(2)(+) and HD(+) are highly relevant for metrology.
  • The composite frequency technique significantly enhances measurement precision by eliminating systematic shifts.
  • These findings pave the way for future high-precision spectroscopic studies and tests of fundamental physics.