Ag ADSORPTION ON THE W(100) PLANE

Abstract

The surface structure of Ag/W(100) has been studied using LEED and Low Energy Ion Scattering Spectroscopy (ISS). We find that Ag coverages are saturated at 0.5 ML after annealing at 800°C regardless of the initial coverages between 0.7~1.0 ML. We observe a c(2×2) image after annealing the Ag/W(100) sample at 800°C. Using the ISS technique the adsorption site of Ag on the c(2×2) surface is found to be the center of the nearest two atoms on the W(100) surface. The height of the Ag adsorption layer is 1.58 Å above the W(100) surface.

Higgsino mass matrix ansatz for MSSM

“…In Z 3 orbifold compactifications, one needs Wilson lines to have the trinification spectrum [6]. One interesting model has been studied before [8], but there the trinification families appear from the untwisted sector. In general, the mass matrix of the untwisted sector is antisymmetric from the H-momentum rule [12,13], and we have an unacceptable relation m t = m c [10].…”

“…Thus, the bare value of sin 2 θ W can be calculated, using the quantum numbers of Eqs. (7,8), to give 2 7 if all sets are contained in tensor products of some elementary representations. In fact, ours does not belong to this category, contrary to the case of trinification, and the bare value of sin 2 θ W is not equal to 2 7 but turns out to be 1 4 .…”

“…To discuss the fields in terms of the SM gauge quantum numbers, let us follow the notation given in [8,9],…”

“…In Ref. [8], the trinification spectrum arises in the untwisted sector. However, that model has two phenomenological problems.…”