Phase diagram forortho-para-hydrogen monolayers
نویسندگان
چکیده
منابع مشابه
Orientational Ordering in Monolayers of Ortho-para Hydrogen
We discuss orientational ordering in monolayers of solid hydrogen in view of recent experimental findings in NMR studies of (ortho)c-(para)1−c-hydrogen mixtures on boron nitride substrate. Analysis of the temperature-concentration behavior for the observed NMR frequency splitting is given on the basis of a two-dimension (J = 1)c-(J = 0)1−c-rotor model with the quadrupolar coupling constant Γ0 =...
متن کاملFirst-principles surface phase diagram for hydrogen on GaN surfaces.
We discuss the derivation and interpretation of a generalized surface phase diagram, based on first-principles density-functional calculations. Applying the approach to hydrogenated GaN surfaces, we find that the Gibbs free energies of relevant reconstructions strongly depend on temperature and pressure. Choosing chemical potentials as variables results in a phase diagram that provides immediat...
متن کاملMonolayers of Ortho-para Hydrogen on Substrate. New Types of Short-range Orientational Ordering
Orientational ordering in monolayers of solid hydrogen is discussed in view of recent experimental findings in NMR studies of (ortho)c-(para)1−c-hydrogen mixtures on boron nitride substrate reported for ortho-H2 concentrations 0.35 ≤ c ≤ 0.92 and temperatures 0.14 ≤ T ≤ 1.80 K. Analysis of the temperature-concentration behavior for the observed NMR frequency splitting is given on the basis of a...
متن کاملNew insulating low temperature phase in dense hydrogen: The phase diagram to 421 GPa
In the quest to make metallic hydrogen at low temperatures a rich number of new phases have been found and the highest pressure ones have somewhat flat phase lines, around room temperature. We have studied hydrogen to static pressures of 421±13 GPa in a diamond anvil cell and down to liquid helium temperatures, using infrared spectroscopy. We report a new phase at a pressure of !356±13 GPa and ...
متن کاملUnderstanding the Phase Diagram of Self-Assembled Monolayers of Alkanethiolates on Gold
Alkanethiolate monolayers on gold are important both for applications in nanoscience as well as fundamental studies of adsorption and self-assembly at metal surfaces. While considerable experimental effort has been put into understanding the phase diagram of these systems, theoretical work based on density functional theory (DFT) has long been hampered by the inability of conventional exchange-...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: New Journal of Physics
سال: 2003
ISSN: 1367-2630
DOI: 10.1088/1367-2630/5/1/335