抄録
We studied the interaction between He molecules and vertically aligned single wall carbon nanotubes (VA-SWNTs) using molecular beam scattering experiments. The time-of-fight (TOF) distributions of the scattered He molecules were measured at various angles of reflection. The angle-resolved flux distributions and energy accommodation coefficients were calculated from the TOF distributions. The angle-resolved flux distributions are all cosine distributions independent of the angles of incidence. The accommodation coefficients are very high and these are near the perfect accommodation. This is because He molecules go inside of the VA-SWNTs and collide with carbon nanotubes many times. The accommodation coefficients depend on angles of both incidence and reflection. This tendency suggests that VA-SWNTs have 'disturbed layer' at the surface.
