aqora

ac Stark effect in multiphoton ionization

Stephen E. Moody, Melissa Lambropoulos

Multiphoton ionization of atomic sodium has been studied experimentally for near resonance between the radiation field and several bound-bound transitions of the atom. It has been found that the atom-field interaction must be treated in a highly nonlinear way to describe successfully the observations, even when the absolute spectral power densities are relatively modest. Rabi frequencies as high as 10 GHz are found to be directly observable with simple flashlamp-pumped tunable dye lasers.

Physical Review AApr 1, 197746 citations

Nonresonant multiphoton ionization in atomic hydrogen (5 pages)

Rajesh Radhakrishnan, R. B. Thayyullathil

Physical Review AJan 1, 20041 citation

Direct (Nonresonant) Multiphoton Ionization of Atoms

Nikolai B. Delone, В. П. Крайнов

Springer eBooksJan 1, 19940 citations

Multiphoton Ionization of Hg and Xe

S. L. Chin, Neil R. Isenor, M. Young

Observations of laser-induced ionization of Hg and Xe are consistent with existing theory. Effects of the depletion of neutral atoms were observed in both cases. It is proposed that the experimental results of others may have deviated from theoretical results because of this saturation effect, and not because of level shifting as suggested.

Physical ReviewDec 5, 196937 citations

Direct (Nonresonant) Multiphoton Ionization of Atoms

Nikolai B. Delone, В. П. Крайнов

Springer eBooksJan 1, 20002 citations

Multiphoton Ionization of Alkali Atoms

R. N. Compton, Adila Dodhy, John A. D. Stockdale +1 more

Multiphoton ionization (MPI) of alkali atoms has played a pivotal role in our understanding of the interaction of intense electromagnetic radiation with matter. The "hydrogen-like" energy levels and absence of low-lying autoionizing states make the alkali atom theoretically tractable. The low ionization potential of these atomic species and the ease with which one can produce atomic beams of alkali atoms facilitate the experimental studies. Many of the early MPI studies involved high-powered fixed-frequency lasers. Presently, the availability of tunable dye lasers with wavelength extension (i.e., frequency doubling, Raman shifting, etc.) makes it possible to study one- to six-photon ionization of the alkali atom with continuously tunable radiation. Also, harmonic generation in these systems which may be present during ionization can be recorded more easily than in other systems since the radiation generated is in the visible or near ultraviolet spectral region. The ability to tune the laser to high Rydberg states with even or odd numbers of photons accesses electronic states of both parities. Stepwise excitation is capable of selectively producing states of high orbital angular momentum. Experiments in which highly excited states are produced in external electric or magnetic fields allow one to test fundamental ideas about the electron–Coulomb system in the quasi–continuum.3Multiphoton ionization (MPI) of alkali atoms has played a pivotal role in our understanding of the interaction of intense electromagnetic radiation with matter. The "hydrogen-like" energy levels and absence of low-lying autoionizing states make the alkali atom theoretically tractable. The low ionization potential of these atomic species and the ease with which one can produce atomic beams of alkali atoms facilitate the experimental studies. Many of the early MPI studies involved high-powered fixed-frequency lasers. Presently, the availability of tunable dye lasers with wavelength extension (i.e., frequency doubling, Raman shifting, etc.) makes it possible to study one- to six-photon ionization of the alkali atom with continuously tunable radiation. Also, harmonic generation in these systems which may be present during ionization can be recorded more easily than in other systems since the radiation generated is in the visible or near ultraviolet spectral region. The ability to tune the laser to high Rydberg states with even or odd numbers of photons accesses electronic states of both parities. Stepwise excitation is capable of selectively producing states of high orbital angular momentum. Experiments in which highly excited states are produced in external electric or magnetic fields allow one to test fundamental ideas about the electron–Coulomb system in the quasi–continuum.3

Topical Meeting on Laser Techniques in the Extreme UltravioletJan 1, 19840 citations

Nonresonant Multiphoton Ionization of He and Ne Atoms

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