Photodetachment study of the 1s3s4s ^4S resonance in He^-

Details Photodetachment study of the 1s3s4s ^4S resonance in He^- Photodetachment study of the 1s3s4s ^4S resonance in He^-

1997-03-06

arxiv.org/abs/physics/9703011v2

Phys. Rev. A, 56(4), 2788-2791, (1997)

Physics

Atomic Physics

LaTeX article, 4 pages, 3 figures, 21 references

Scientific paper

10.1103/PhysRevA.56.2788

A Feshbach resonance associated with the 1s3s4s ^{4}S state of He^{-} has been observed in the He(1s2s ^{3}S) + e^- (\epsilon s) partial photodetachment cross section. The residual He(1s2s ^{3}S) atoms were resonantly ionized and the resulting He^+ ions were detected in the presence of a small background. A collinear laser-ion beam apparatus was used to attain both high resolution and sensitivity. We measured a resonance energy E_r = 2.959 255(7) eV and a width \Gamma = 0.19(3) meV, in agreement with a recent calculation.

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