32 citations · 42 across the 4 of their papers we have counts for
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Precision Positronium Spectroscopy as a Test of the Helium Ionization Energy Anomaly
J. Pérez-Ríos, D. B. Cassidy
Precise measurements of the metastable helium (1s)(2s) ionization energy have revealed a 9 discrepancy with QED theory that persists in isotopic measurements, suggestin…
Positronium density measurements using polaritonic effects
Erika Cortese, David B. Cassidy, Simone De Liberato
Recent experimental advances in Positronium (Ps) physics have made it possible to produce dense Ps ensembles in which Ps-Ps interactions may occur, leading to the production of Ps$…
Formation of positron-atom bound states in collisions between Rydberg Ps and neutral atoms
A. R. Swann, D. B. Cassidy, A. Deller +1
Predicted twenty years ago, positron binding to neutral atoms has not yet been observed experimentally. A new scheme is proposed to detect positron-atom bound states by colliding R…
Single-color two-photon spectroscopy of Rydberg states in electric fields
T. E. Wall, D. B. Cassidy, S. D. Hogan
Rydberg states of atomic helium with principal quantum numbers ranging from n=20 to n=100 have been prepared by non-resonance-enhanced single-color two-photon excitation from the m…