Improved theory of helium fine structure

Area of Science:

• Atomic physics
• Quantum electrodynamics (QED)

Background:

• Helium's fine-structure splitting is a key test for quantum electrodynamics.
• Previous theoretical models have limitations in precision.

Purpose of the Study:

• To provide improved theoretical predictions for the 2(3)PJ levels in helium.
• To calculate higher-order contributions to fine-structure splitting.

Main Methods:

• Calculation of contributions of order alpha^5 Ry.
• Utilizing advanced theoretical methods in bound state QED.

Main Results:

• New theoretical predictions for transition frequencies nu(01) and nu(12).
• Results show significant disagreement with experimental values.

Conclusions:

• The discrepancy indicates an unresolved issue in bound state QED.
• Further theoretical and experimental investigation is required.