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Publication
Chemical Physics Letters
Paper
Elemental composition of ions associated with low mass carbon clusters generated by UV laser ablation of polyimide
Abstract
Previously, it has been shown that three types of C clusters, characterized by mass range and relative intensities, are produced upon laser ablation of polyimide. The low mass clusters, Cn 9 < n < 25, always appear coincident with peaks 2 amu greater than the bare C cluster. Using perdeuterated polyimide, we have established the elemental composition of these peaks to be predominately, CnH2, rather than Cn-1N, which is allowed since polyimide contains 5 at% N. These results establish the positive ion spectrum of polyimide to be composed of C and H with little contribution from heteroatoms, and show that low mass C clusters preferentially add 2 H atoms in the high energy, multi-element plasma induced by the laser. © 1989.