Density functional prediction of the structural, elastic, electronic, and thermodynamic properties of the cubic and hexagonal (c, h)-Fe2Hf

Using density functional theory (DFT), the structural, elastic, electronic, and thermodynamic properties of Fe2Hf in the cubic and hexagonal solid phases with Fd-3m and P63/mmc are reported with generalized gradient approximations (GGA). To achieve energy convergence, we report the k-point mesh density and plane-wave energy cut-offs. The calculated equilibrium parameters are in good agreement with the available theoretical data. A complete elastic tensor and crystal anisotropies of the ultra-incompressible Fe2Hf are determined in the wide pressure range. Finally, by using the quasi-harmonic Debye Model, the isothermal and adiabatic bulk modulus and heat capacity of Fe2Hf are also successfully obtained in the present work. By the elastic stability criteria, it is predicted that Fd-3m and P63/mmc structures of Fe2Hf are stable in the pressure range studied, respectively

TIME RESOLVED TRANSIENT ABSORPTION PROBING OF A LASER PLASMA

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Time resolved transient absorption probing of a laser plasma

The described experimental setup allows the kinetic analysis of a pulsed-laser generated gas-plasma by transient visible absorption spectroscopy at a time resolution of 10 ns and a spectral resolution of 0.3 cm$^{-1}$. Absorption from the first-4s level manifold towards the 5p level manifold of the argon atom is reported in the spectral range around 420 nm. An example of time dependence is given for the 4s[3/2]$_2$ level population.On décrit un dispositif expérimental qui permet l'étude de la dynamique de déclin d'un plasma, créé dans un gaz par un laser en impulsion, par spectroscopie d'absorption transitoire dans le visible, avec une résolution temporelle de 10 ns et une résolution spectrale de 0,3 cm$^{-1}$. On donne comme exemple l'absorption à partir des premiers niveaux excités 4s vers des niveaux 5p de l'argon. La dépendance temporelle est donnée pour la population du niveau 4s[3/2]$_2$

TIME RESOLVED TRANSIENT ABSORPTION PROBING OF A LASER PLASMA

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Rempi and LRF spectroscopy of Kr2* excimer

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