多価イオン化学研究のための Bradbury-Nielsen ion gate の設計・製作と性能評価
We succeeded to select a single isotope peak of multiply charged ions by using the time-of-flight mass spectrometer equipped with curved-field reflectron and newly constructed Bradbury-Nielsen gate (BNG). BNG consists of tungsten wires (10 μm in diameter) with 196 μm spacing (standard deviation 7.7%). The multiply charged xenon was produced by femtosecond laser irradiation (0.8 μm, 40 fs). The actual selection ability for 134Xe3+ (5.3 ns fwhm) was 30 ns (fwhm). The rise and fall time (10% to 90%) were 9 and 8 ns, respectively. It is found that our BNG is capable of selecting a single isotope peak from the others separated by 40 ns. The charge dependent reactions of the multiply charged molecular ions such as quadruply charged triphenylene can be investigated.