Abstract
Through resonance ionization measurements involving two-color, three-photon excitation, and four-photon ionization we observe very large, multiple, pressure-dependent line shifts in Xe. All features of the observed collective line shifts are in very close agreement with accompanying theoretical predictions.
- Received 8 January 1990
DOI:https://doi.org/10.1103/PhysRevLett.64.1717
©1990 American Physical Society
