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Quantum Beats In The Electric-Field Quenching Of Metastable Hydrogen, A. Van Wijngaarden, E Goh, Gordon W. F. Drake, P. S. Farago
Quantum Beats In The Electric-Field Quenching Of Metastable Hydrogen, A. Van Wijngaarden, E Goh, Gordon W. F. Drake, P. S. Farago
Physics Publications
The strong field-induced quantum beats observed in beam-foil studies of Ly- alpha radiation are obtained in a conventional metastable-hydrogen quenching experiment. The phase relation between the Stark shifted 2s 1/2- 2p 1/2 Lamb-shift oscillations and the much more rapid 2s 1-2p 3/2 fine-structure oscillations depends on the detailed way in which the quenching field is switched on. Apart from a phaseshift, the results agree with a non-perturbative theoretical calculation which assumes that the field is applied suddenly. Various frequency components of the time-dependent radiation intensity are identified with specific hyperfine transitions or groups of transitions. No adjustable parameters are used …
Relativistic Corrections To Spin-Forbidden Electric-Dipole Transitions, Gordon W. F. Drake
Relativistic Corrections To Spin-Forbidden Electric-Dipole Transitions, Gordon W. F. Drake
Physics Publications
Theoretical results for spin-forbidden electric-dipole transitions have recently been questioned on the grounds that relativistic corrections to the transition operator were not included. It is shown here that these corrections are automatically included when the transition operator is expressed in the dipole length form. The above criticism of previous dipole-length calculations is therefore unfounded. The 1s2p 3P1-1s21S0 and 1s2p 3P1-1s2s 1S0 transitions of helium are discussed as specific numerical examples.
Calculated Anisotropies For The Quenching Radiation In The Hydrogen Isoelectronic Sequence, Gordon W. F. Drake, C. P. Lin
Calculated Anisotropies For The Quenching Radiation In The Hydrogen Isoelectronic Sequence, Gordon W. F. Drake, C. P. Lin
Physics Publications
Accurate values of the Lamb shift can be derived from measurements of the anisotropy in the angular distribution of the radiation accompanying the electric field induced 2s-1s transition of hydrogen. Calculations of the anisotropy, including relativistic and hyperfine structure corrections, are presented for the hydrogenic ions up to S15+. The data enable the calculation of the Lamb shift from a measured value of the anisotropy. © 1976 The American Physical Society.