Two-electron-one-photon transitions in polycenter systems

P. G. Bodashko, Sergey A. Zapryagaev, U. I. Safronova +1 more

Vinay Shukla, Vaishali Naik, Alok Chakrabarti +1 more

M. A. Bondarev, E. Yu. Perlin

A theory of the transient absorption of femtosecond light pulses at a two-photon–one-photon double resonance on adjacent interband transitions in the electronic system has been developed. Approximate expressions for the reactive component of the nonlinear polarization of the three-level system, P s, which determines the absorbed power in the medium, have been obtained, and the dependences of P s on the light intensity and detunings of resonances have been calculated.

K. N. Lyashchenko, O. Yu. Andreev, Deyang Yu

We have studied two-electron one-photon transitions in dielectronic recombination with H-like ions ($Z=5--54$) within ab initio QED theory. It was found that interference between dielectonic recombination with two-electron one-photon transitions and radiative recombination is prominent for light and medium ions being large enough for experimental observation. The interference manifests itself firstly in a sharp Fano-like resonance structure and secondly in a noticeable distortion of the photon angular distribution of the radiative recombination.

Pavel A Apanasevich, G. I. Timofeeva

Alexander B Voitkiv, Bennaceur Najjari

We consider one-photon ionization in a system consisting of two different atoms, $A$ and $B$, which are well separated in space. In such a case, photoionization of the atom with a lower ionization potential can be very strongly influenced, via two-center electron-electron correlations, by resonant electron dipole transitions induced in the other atom. We present a detailed consideration of this resonant photoionization process and discuss a number of effects that are inherent to it.