Photoexcitation and ionization of a hydrogen atom confined by a combined effect of a spherical box and Debye plasma

Two-photon transitions in confined hydrogenic atoms

“…These features can be explained on the basis of the change in energy spectrum and radial matrix elements with Debye as well as spherical confinement. The detailed structure of energy spectrum for such a confined system has been described in our earlier works [15,21]. The decrease in number of bound states and increasing separation of the energy levels for smaller r 0 values are responsible for the observed behaviour.…”

“…The spectrum, oscillator strengths and other physical quantities of confined systems are known to be highly dependent on the chosen confinement parameters and hence need an accurate evaluation. The evaluation of energy spectra and oscillator strengths of confined hydrogen in Debye plasma environment has been carried out and the results for various confining radii and Debye lengths characterizing different plasma conditions have been reported in our earlier works [15,21]. The steps necessary for arriving at these results are summarized below for ready reference.…”

“…The plasma environment considered here is Debye plasma where Debye screening length, λ D = k B T /(4πe 2 n), being a function of the plasma temperature T and its density n, plays an important role. Various sets of plasma conditions involved in real plasma environments can be simulated for one value of λ D as one can evaluate the plasma temperature for a particular number density and vice-versa by fixing λ D [15].…”

“…In case of atoms and molecules confined under various conditions, the potential is modelled by a so-called Debye-Hückel potential [16]. The other form of screened potential called the exponential cosine screened coulomb potential, has long been used to describe an ionized impurity inside a semiconductor heterostructure [13,15,17,18]. These screened potentials are prototype for many physical processes such as atoms confined in Debye or Debye-cosine plasmas, where atomic properties change drastically compared to free atoms, depending on the screening parameter, in particular [13,15,[19][20][21].…”

Two Photon Processes in an Atom Confined in Gaussian Potential

“…Also, CdSe quantum rods have been shown to exhibit four times larger TPA as compared to quantum dots of the same mass [24]. Similar studies have recently been initiated with much vigor in the case of atoms and ions confined in a variety of plasma environments and other confinements [25][26][27][28][29][30][31][32][33][34][35][36]. Some works on two-photon transitions in atoms or ions employing the Ion-Sphere model [37] for strongly-coupled plasmas were also reported in the literature [34,38,39].…”