Secondary ion mass spectrometry (SIMS) has become a powerful tool for a chemical imaging of surfaces. In particular, cluster ion beams have been widely implemented with SIMS using spatial distributions of molecules as an analysis and imaging method for a sample composed of organic molecules. In this study, we developed a home-built time-of-flight (ToF)-SIMS instrument and generated organic molecular cluster ion beams ionized by multiphoton ionization (MPI) as a primary ion beam. Further, the sample stage loaded with rhodamine 6G was bombarded with size-controlled toluene cluster ions to produce secondary ions. Mass spectra of rhodamine 6G were acquired as a function of the size of toluene cluster ions. We plotted the fragments-to-parent ion ratio against each size of cluster ion, and we found that an intact rhodamine 6G signal would be observed with less fragmentations using (Tol) n > 18+ . We expect this combination of the organic molecular cluster ion beam generated by MPI and ToF-SIMS to greatly expand the field of surface analysis.
Choi, C. M., Lee, S. J., Baek, J. Y., Kim, J. J., & Choi, M. C. (2018). ToF-SIMS analysis of an organic layer using toluene and its cluster ion beam projectiles generated by multiphoton ionization. Applied Surface Science, 458, 805–809. https://doi.org/10.1016/j.apsusc.2018.07.157