The adsorption of cyanogen (C2N2) on Cu(001) has been investigated using helium atom scattering. Adsorption at 263 K produces a two domain structure with periodicity c(10 × 6) and symmetry c2 mm. The principle axes of the two domains in the c(10 × 6) pattern lie at right angles to one another....

The adsorption of acetonitrile (CH3CN) on Cu(001) has been studied using elastic Helium atom scattering (HAS) and has been analyzed using a novel method of direct HAS diffraction image inversion. At low temperatures (138 K) acetonitrile permanently adsorbs forming a c(4 × 2) structure at...

Suppose a two-dimensional dynamical system has a stable attractor that is surrounded by an unstable limit cycle. If the system is additively perturbed by white noise, the rate of escape through the limit cycle will fall off exponentially as the noise strength. The presence of this slowly...