“…Quantitative composition analyses of the ®lms were performed by RBS. High energy 4 He ion beams of 3.5 MeV with a ®xed scattering angle of 165³ were employed to increase the sensitivity of N and C elements. 15,16 The non-RBS cross sections of 4 He ion from C and N 15,16 were linked to the RUMP2 program (ver.…”