Nu Instruments | Principles of Zoom Optics in Noblesse
This note explains how zoom optics allow Noblesse to vary mass dispersion while keeping ion beams focused at fixed collectors. It demonstrates the approach using Kr isotopes and shows why it supports flexible multicollection.
Zoom optics use a pair of miniature quadrupole lenses positioned between the magnet and collector. By adjusting the lenses, Noblesse can vary mass dispersion while maintaining focus at the collector slits.
This is especially useful for instruments with fixed collectors. The note demonstrates that, after a 2 amu mass shift, Kr isotope peaks no longer align unless the zoom setting is adjusted.
By restoring peak alignment instantly, zoom optics enable flexible multicollection without moving collectors. This avoids moving parts, reduces outgassing risks and supports fast changes during analysis.
Key Takeaways:
- Zoom optics vary dispersion while keeping ion beams focused.
- Fixed collectors can be used flexibly for different isotope sets.
- Peak alignment can be restored rapidly after mass shifts.
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