Helium, embedding function

A Y/ A Z or AF/A(0/H) may vary, either systematically as a function of Z or randomly, e.g. if some H n regions are self-polluted with helium and other elements (e.g. N) ejected in winds from massive embedded stars. There is some evidence that this actually happens in a very few cases, such as the nucleus of NGC 5253, where the continuum shows a strong, broad feature at the He+ wavelength X 4686, due to Wolf-Rayet stars. 

The VMC and QMC methods can be successfully applied to vibrational problems as well. For example, Blume et al. [51] calculated the vibrational frequency shift of HF molecules embedded in helium clusters as a function of cluster size, for up to 198 helium atoms. They obtained good agreement with experimental results. Quantum clusters have also been studied by Rick et al. [52] and Barnett and Whaley [53], with good agreement between the calculated energies and the exact values. 

The applications of this model is mostly restricted to hydrogen and helium like systems. Winkler [25] has calculated the detachment energies of H embedded in a variety of Debye plasmas. He used a correlated description of the two-particle wave functions introducing interparticle coordinate in the expansion of the basis set. The linear variational parameters are determined by solving the generalized secular equation... 

Fig. 7.4. Dependence of the depletion signals for infra-red bands of (SFe) clusters embedded inside helium droplets with N = 4.1 10 atoms as a function of the SFe pressure in a pickup cell. ° Solid curves are best fits based on a Poisson distribution (Eq. (7.2.1)) for a pick up cross section of 3900 A. The insert shows a schematic representation of the pick-up, coagulation and resulting heating induced evaporation. ...

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