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Four elliptically polarized waves acting in a cold and unmagnetized plasma are shown to be responsible for the parametric evolution in time of the rotation of the principal polarization axes (the precession frequency) and some other nonlinear effects in two evolving waves by two other powerful...
For the case in which laser radiation interacts with two levels of an atom, it is shown that there can be gain, even when there is no population inversion, because of recoil effects. The effect of recoil on certain precision measurements is also shown.
The impact-parameter dependences of the ionization probability of the carbon and aluminum K shells by proton impact have been measured in a proton-x-ray coincidence experiment. Influences of the fluorescence yield and of the multiple scattering of the projectiles inside the target foils on the...
The energy dependence of the cross sections for both the K α (one-electron, one-photon) and K α α (two-electron, one-photon) x-ray emissions for Ni-Ni collisions have been measured in the energy range 17.6-91.5 MeV. To account for these observations, we have extended the electron promotion...
Cross sections for the photoionization of H 2 ( X Σ g + 1 , v i ) in vibrational levels v i = 0 - 14 are determined for a range of photon energies by a two-center treatment in which the derived electronic matrix elements are averaged over the initial and final vibrational states of the molecule...
Using a laser-excitation, optical-detection scheme, we have observed microwave transitions from the nd to the nf and ng orbital levels in lithium states with principal quantum number n from 7 to 11. These measurements yield precise values for the d , f , and g state fine-structure intervals as...
Rotational excitation cross sections for e -C O 2 scattering in the energy range from 0.07 to 10.0 eV have been calculated using a coupled-channels procedure together with the adiabatic-nuclei (impulse) approximation. Results are presented for excitation from j = 0 to j ′ = 0 , 2 , and 4 ....
Semiclassical expressions of two-photon ionization of two colliding atoms are derived for a wide range of electromagnetic field intensity and detunings from the isolated atom line. The dependence of the ionization yield on the details of the interaction potential of the system is derived. This...
Transitions between adiabatic surfaces are described semiclassically via trajectories propagating about their complex intersection point. This intersection point is a branch point of the potential function and a simple pole of the nonadiabatic coupling. Thus transitions may be described without...
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