Elemental composition of ions associated with low mass carbon clusters generated by UV laser ablation of polyimide
✍ Scribed by J.T. Brenna; W.R. Creasy; W. Volksen
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 334 KB
- Volume
- 163
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
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, C., 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, C-H,, rather than C,_,N, 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 m the high energy, multi-element plasma induced by the laser.