As the inventor of the Zeeman technique in the late 1960s, Varian patented all possible Zeeman configurations and chose to adopt the more sensitive AC modulated Zeeman technique. This system has proven to give the best detection limits of any Zeeman spectrometer available. Today, Varian offers the new generation AA240Z and AA280Z Zeeman instruments. These instruments continue to set the industry benchmarks for uncompromised Zeeman performance. The SpectrAA Zeeman instruments offer the highest sensitivity, performance, simplicity of operation and industry leading software expected of a worldwide leader in atomic spectroscopy.
The combination of a Constant Temperature Zone graphite furnace, fast Zeeman background correction and polynomial interpolation ensures superior spectral interference correction and maximum sample accuracy. In addition, Varian's low thermal mass graphite tubes with their long atom cell and fixed 0.8 Tesla AC magnetic field maximizes sensitivity.
Varian's Zeeman range comprises the AA240Z with up to 4 fixed lamp positions and the AA280Z with up to 8 fixed lamp positions (shown above). These instruments are supplied complete with the GTA120 Zeeman graphite tube atomizer, ensuring superior graphite furnace performance
Key benefits include:
Enhanced detection limit performance
For ultra trace level detection limits, simply plug in Varian's UltrAA lamps. UltrAA lamps are high intensity boosted discharge lamps that reduce noise and enhance sensitivity, ensuring better (lower) detection limits can be achieved.
Optimized performance
The AA280Z/AA240Z enable the user to optimize the background correction to enhance sensitivity and reduce interferences. To achieve this, the magnetic field strength is PC-controlled over range 0.1–0.8 Tesla. Yet the field strength remains locked during measurement minimizing effect of mains voltage variations.
Versatility
Using the VGA for Zeeman adaptor, you can use the hydride generation technique on the Varian Zeeman instruments. This offers an easy and reliable way of validating your Zeeman graphite furnace AA results, and also offers you the flexibility to analyze difficult matrices.
The AA240Z and AA280Z are controlled by our acclaimed Windows based Worksheet software. Use multi-tasking capabilities to start today's analysis while simultaneously preparing a report on yesterday's results.
