The schematics of the cylindrically symmetric LAMA instrument. The figure also shows the focusing of the laser to the target and illustrative ion trajectories.
The simulated and experimentally measured mass resolutions plotted as a function of the radial impact position. The two curves are not to compare directly. See text for details.
The radial position (in millimeters) of ion impacts on the ion detector as a function of the initial energy and elevation angle.
The fraction of ions collected as a function of the detector radius. See text for details.
The optical setup used for the focusing of the laser beam.
The crated generated by an intense laser bombardment of copper target as viewed under a microscope. The crater is the small dark spot approximately in the middle of the brighter spot.
(a) The mass spectrum from a contaminated brass surface. (b) Mass spectrum after cleaning the surface. The insets show the details of the brass peaks.
The mass resolution of the Na and Cu peaks plotted as a function of the peak intensity.
The mass spectra measured on a lead target. (a) The spectrum at low laser energy from a surface before cleaning. (b) The mass spectrum after cleaning the surface. (c) The spectrum at high laser energy setting .
The mass spectra measured on a graphite target. The spectra are for (a) , (b) , and (c) laser energy.
The mass spectrum of negative ions obtained from a brass target.
The dimension of the annular and ring electrodes and their bias potentials. The annular electrodes are measured as a radial distance from the cylindrical axis of the instrument. The ring electrodes are measured as distance from the grounded grid electrode (Fig. 1).
Article metrics loading...
Full text loading...