Direct recoil spectrometry

The surface structures of ionic liquids have been studied by direct recoil spectrometry. In this experiment, a pulsed beam of 2-3 keV inert gas ions is scattered from a liquid surface, and the energies and intensities of the scattered and sputtered (recoiled) ions are measured as a function of the incident angle, a, of the ions. Figure 4.1-16 shows a scheme of the process for both the scattered and sputtered ions. 

Figure 4.1-17 The experimental set-up used to generate thin films of Ionic liquid for analysis by direct recoil spectrometry. Reproduced from reference 58 with permission.

Figure 4.1-18 Ion intensity as a function of incident angle measured using time of flight direct recoil spectrometry on [OMIMJfPFg]. Reproduced from reference 57 with permission.

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