Complete determination of excitation amplitudes and phases for the 31D state of helium

A. G. Mikosza*, J. F. Williams, J. B. Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Observations of triple coincidence polarization correlations of the sequential cascading photons (667.8 nm 31D → 21P and 58.4 nm 21P → 1S transitions) and the scattered electrons from electron impact excitation of the 31D state of helium have determined the amplitudes and relative phases of the magnetic substates. The ambiguity of electron-photon coincidence measurements, which determine only the cosine of the sum of the phases between the m = ±2 amplitudes, is resolved. The measured amplitudes and phases at 60 eV incident energy and 40° scattering angle confirm the convergent close coupling values.

Original languageEnglish
Pages (from-to)3375-3378
Number of pages4
JournalPhysical Review Letters
Issue number18
Publication statusPublished - 3 Nov 1997
Externally publishedYes


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