Improved result for helium 2(3)S1 ionization energy

Area of Science:

• Atomic Physics
• Quantum Electrodynamics (QED)
• Relativistic Quantum Mechanics

Background:

• The 2(3)S1 state in helium is a crucial system for testing fundamental theories.
• Precise theoretical predictions are essential for comparing with experimental measurements.
• Previous calculations lacked the precision to fully resolve experimental discrepancies.

Purpose of the Study:

• To perform a complete calculation of relativistic and quantum electrodynamic effects to order malpha(6) for the helium 2(3)S1 state.
• To reduce the theoretical uncertainty in the energy prediction of this state.
• To provide improved theoretical predictions for comparison with experimental data.

Main Methods:

• Application of relativistic quantum mechanics.
• Inclusion of quantum electrodynamic effects up to order malpha(6).
• Detailed theoretical calculation of energy levels.

Main Results:

• A complete calculation of relativistic and QED effects to order malpha(6) was performed.
• The result for the energy shift is -3.00(1) MHz.
• This calculation significantly reduces the theoretical uncertainty for the 2(3)S1 state.

Conclusions:

• The improved theoretical predictions offer a more precise value for the helium 2(3)S1 state energy.
• The new results aid in resolving discrepancies between theory and experiment.
• This work advances the precision of atomic physics calculations.