Cesium hydride

Moritz, G., Wolf, A., Reiher, M. Relativistic DMRG calculations on the curve crossing of cesium hydride. J. Chem. Phys. 2005, 123(18), 184105. 

CsHC, or CsjCj. CaHa,wh crysts, mp ca 300, sol in liqNH, reacts explosively with some inorg compds. Was prepd by Moissan by treating cesium hydride with acetylene at 100° or by passing acetylene through Cs-NH, soln... 

Laser photoexcitation of cesium atoms to the 7P state in the presence of hydrogen gas leads to the formation of cesium hydride by a process which is shown to be indirect. The concentration of the reactants is studied under various experimental conditions using a laser fluorescence technique. The rate coefficient of CsH formation is found to be proportional to the Cs(6S) density suggesting a two step process with the formation of an intermediate species which reacts with ground state cesium atoms. 

This process was reported for the first time by Tam and Mapper (1). Using the lines of an argon ion laser they photoexcited the cesium atoms to the 7P state through the broadened 6S-7P lines and observed the formation of macroscopic crystals of cesium hydride ("laser snow"). More recently Picqu and coworkers ( ) have reported the same observation using a tunable dye laser resonant with each of the fine structure components of the 6S-7P transition. 

Cesium hydride, when heated directly with phosphorus gives CsPH ... 

The observation of electric transport in dense supercritical ionic phases stimulated the investigation of conductance in supercritical metals above 1500 °C and to pressures of about 2000 bar. The conductance of mercury was investigated and continuous metal-nonmetal transition was observed [25]. An impressive amount of further aspects of such metal-nonmetal transitions has been studied later in alkali metals and other fluids (see F. Hensel and coworkers) [25a]. A metal-nonmetal transition was also observed in cesium hydride and cesium in the liquid state at high hydrogen pressures [26] which corresponds to the earlier non-pressure work of Max Bredig [26a] with liquid metal-metal halide systems. 

Keller, E., and Franck, E.U., (1997X Electric Conductivity of Supercritical Cesium-Cesium Hydride Mixtures of High Temperatures and Pressures, Ber. Bunsenges. Physikal Chem. 101, 821-830. 

Ghandehari K, Luo H, Ruoff AL et al (1995) New high pressure crystal structure and equation of state of cesium hydride to 253 GPa. Phys Rev Lett 74 2264-2267... 

---