Hydrogen electron-phonon coupling

The model of the chain of hydrogen atoms with a completely delocalized (metallic) type of bonding is outlined in the preceding section. Intuitively, a chemist will find this model rather unreal, as he or she expects the atoms to combine in pairs to give H2 molecules. In other words, the chain of equidistant H atoms is expected to be unstable, so it undergoes a distortion in such a way that the atoms approach each other in pairs. This process is called Peierls distortion (or strong electron-phonon coupling) in solid-state physics ... 

The choice of the host material is generally dictated by the need to maintain a weak electron-phonon coupling and to prevent high-efficiency spectral hole-burning. The latter requirement has so far prevented hydrogen-bonded matrices from being sue-... 

Table II presents the DOS evaluated at the Fermi energy for fixed hydrogen concentration and a range of y values for each of the palladium-noble metal-hydrogen systems considered. These results have been used[14] to calculate the electron-phonon coupling and provide an explanation of the variation (as a function of y) of the superconducting transition temperature T found in Stritzker s[16] experiments.

Skin-resolved bond contraction and entrapment perturb that the Hamiltonian originates and the increased fraction of undercoordinated atoms expands the Eg-Energies of photon emission and photon absorption are superposition of the interatomic binding energy and the electron-phonon coupling i.e., Stokes shift. Polarization of the dangling bond electrons creates the mid-gap states and band tails, which lowers the quantum efficiency of photon emission hydrogenation could annihilate such defect states. 

The EMA is a quasi-particle theory, which treats the hole created in the valence band and electron excited to the conduction band, as free particles whose effective masses are determined by a quadratic fit to the curvature at the band minima (maxima) of the conduction (valence) band (Fig. 1). If we add the coulumbic attraction of an electron and hole to this picture, we can have a theoretically simple manifestation of an exciton. The electron and hole are bound together by a screened coulomb interaction to form a so-called Mott-Wannier exciton [29],This exciton presents an energy spectrum analogous to a hydrogen atom (i.e. with radial and angular quantum number) but it is further complicated by the fact that it is coupled to a thermal bath of phonons and that the mass of an exciton is energy dependent. 

---