High Mass Resolution and Sensitivity Simultaneously
Reflectron TOF Analyser
The TOF.SIMS 5 is equipped with a gridless reflectron type Time-of-Flight analyser.
The non-linear reflectron design provides very high transmission and very high mass resolution in positive and negative SIMS.
No apertures or slits need to be narrowed to achieve this level of mass resolution.
The instrument operates with full transmission all the time.
The extractor electrode is relatively small and has a conical shape. This compact design of the analyser extraction optics allows for direct access to the target for a large number of analytical components.
The design also minimises memory effects in depth profiling due to the special shape and the small area exposed to secondary particles.
The reflectron type Time-of-Flight analyser also provides an energy acceptance of up to 500 eV and a large angular acceptance.
The high transmission and mass resolution are maintained even at maximum energy acceptance.
High resolution mass spectra in positive and negative secondary ion mode. Both spectra were acquired using Bi1+ as the primary ion projectile.
The TOF.SIMS 5 extraction optics allows for a large depth-of-field. This is especially important for the analysis of topographical samples.
The example shows a chemical analysis of a human hair. The hair diameter is about 95 µm. The TOF.SIMS 5 provides homogenous sensitivity over the full analysis area and shows minimum shadowing effects.
Advanced Secondary Ion Detector for highest Dynamic Range
The TOF.SIMS 5 uses a special secondary ion detector with a single channelplate-scintillator-photomultiplier combination.
The lifetime of such a detector is about 1,000 times higher than for conventional dual channelplate detectors.
The detector can also process high count rates without suffering from detector degradation, an effect well known for dual channelplate detection systems.
Hence blanking of intense matrix ion peaks is not necessary at all.
In combination with the patented IONTOF EDR technology the TOF.SIMS 5 provides a dynamic range of up to seven orders of magnitude.