Number Of Xe Atoms Research Articles

Phase Transitions in Confinements: Controlling Solid to Fluid Transitions of Xenon Atoms in an On-Surface Network.

This study reports on "phase" transitions of Xe condensates in on-surface confinements induced by temperature changes and local probe excitation. The pores of a metal-organic network occupied with 1 up to 9 Xe atoms are investigated in their propensity to undergo "condensed solid" to "confined fluid" transitions. Different transition temperatures are identified, which depend on the number of Xe atoms in the condensate and relate to the stability of the Xe clustering in the condensed "phase." This work reveals the feature-rich behavior of transitions of confined planar condensates, which provide a showcase toward future "phase-transition" storage media patterned by self-assembly. This work is also of fundamental interest as it paves the way to real space investigations of reversible solid to fluid transitions of magic cluster condensates in an array of extremely well-defined quantum confinements.

Atomistic simulations of the small xenon bubble behavior in U–Mo alloy

Abstract The behavior of small xenon (Xe) bubble in U–Mo alloy fuel is investigated by the classical molecular dynamics (MD) simulations. The results indicate that the pressure in the Xe bubble is initially quite high and then rapidly decreases with the increasing Xe atoms until it reaches a minimum, and then slowly increases. The radius of Xe bubble increases rapidly with the increase of the number of Xe atoms at beginning and slows down at a high number of Xe atoms. The evolution processes of Xe bubbles coalescence in U–Mo alloy matrix and Xe gas atoms release near U–Mo alloy surface show that the critical temperature of the bubbles coalescence increases with increasing the initial distance between the centers of two bubbles and the critical temperature of the Xe atoms release increases with the initial distance from the center of bubble to the surface of the U–Mo alloy, respectively. The evolution processes of small Xe bubbles in the U–Mo alloy are similar although the Xe bubbles under the different initial conditions. The surface energy of U–Mo alloy is estimated between 0.45 and 0.50 J/m2, which is in accordance with the theoretical values of 0.43 and 0.5 J/m2 used in the literature.

Time-resolved dynamics of charge transfer to solvent states in solvated iodide clusters

Abstract The dynamics of the cluster precursors to charge-transfer-to-solvent (CTTS) states have been studied in clusters of iodide with xenon, water, D 2 O, ammonia and methanol using femtosecond photoelectron spectroscopy. The dynamics of these states differ dramatically according to solvent type and number. Excitation of the lower CTTS state in I − (Xe) n clusters yields a state that is stable over the time scale of the experiment (∼200 ps), whereas the upper spin-orbit state decays by spin-orbit autodetachment within 500 to 1000 fs, depending on the number of Xe atoms. The hydrogen-bonded clusters show evidence for partial solvation of the excess electron following CTTS excitation. In general they exhibit more complicated dynamics which correspond to internal rearrangement in one or more electronic states. A description including isomerization and electron solvation is given for the I − (D 2 O) n clusters, and compared to the dynamics observed in I − (NH 3 ) n and I − (CH 3 OH) n clusters.