A puzzle in the inelastic scattering of atoms from surfaces

The insensitivity of helium atoms to possible inelastic scattering involving bulk phonons that terminate at the surface is explained in terms of the experimental parameters that need to be incorporated into the scattering theory.     

Evaluation of the pion-nucleon sigma term

We have evaluated the σ-commutator term for πN scattering by using a new method to extrapolate the C⁽⁺⁾ amplitude below threshold. Reproducing kernel techniques are used to extrapolate along hyperbolic curves whose lower branches lie within the physical region for energies above the elastic threshold. The value obtained is σ_NN^ππ = 57 ± 12 MeV.     

Preparation,structure and asymmetric diels-alder reactions of 10-arylsulfonylisobornyl acrylates

The crystalline chiral auxiliaries 4 and 5 were readily prepared from camphorsulfonic acid. Their acrylates underwent the diels-alder reactions 6 → 7 with modest asymmetric induction consistent with an X-ray study of $\text{6a}$.     

De-excitation processes near the surface of ion bombarded SiO2 and Si

Ion bombardment induced secondary ion and optical excitation from oxide coated Si has been studied as the oxide layer is eroded away. By comparing ion and photon yields, a model for the role of resonant and Auger electron transitions in the neutralisation and de-excitation of the sputtered atoms and ions has been suggested.