Thermo Scientific™ TRITON Plus Thermal Ionization MS

Description

The Thermo Scientific™ TRITON Plus thermal ionization mass spectrometer sets another standard in high-precision TIMS isotope ratio measurements. It builds upon the strong field-proven reliability and cutting-edge technology from the TRITON instrument: high sample throughput, variable multi-collector, zoom optics, and multi-ion counting. New features include a dual RPQ and multiple discrete dynode electron multipliers for high dynamic ranges, as well as unsurpassed linearity and stability.

The thermal ionization source is characterized by a very small kinetic energy spread of the ions (~0.5 eV). A single focusing geometry that focuses on angular divergence only is therefore fully sufficient. Chromatic aberrations due to the initial energy spread of the ions can be neglected. In this configuration, the magnetic sector lens focuses ions of different mass along an inclined focal plane with a 45° angle. The magnet is laminated for high-speed peak jumping and low hysteresis. The inner width of the flight tube is 14 mm, ensuring minimal scattering. Baffles are present along the flight path to directly catch any diverging ions and to minimize scattering at the side walls.

The ion source optics of the Thermo Scientific™ TRITON Plus TIMS have been optimized for maximum ion transmission for both single and double filament techniques. The sample turret holds 21 single or double filaments. The filaments can be easily exchanged without using any tools. The TRITON Plus system allows easy glove box adaptation for nuclear applications. It also offers an optional preheat device to heat up the next sample (max. 2) prior to analysis. A gas bleed system can be installed as well to bleed in gas into the ion source. The ion source is held at an acceleration potential of  10 kV to achieve optimum sensitivity.

The Faraday cups used in the TRITON PlusTIMS are the largest ever produced for a commercial multi-collector. They are laser machined from solid carbon to guarantee a uniform response, high linearity, low noise and long lifetimes. The Faraday cups are designed to completely eliminate the need for cup factors.  At increasing ion-optical magnifications, the divergent angles of the ion beams are reduced and dispersion is increased. As a result, cups can be wider and deeper. Scattered particles released from the cup sidewalls by the incoming ion beams are less likely to escape and do not alter the “true” ion current measured.

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