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Double-focusing LC/MS system The JMS-700 MStation double-focusing mass spectrometer is designed for high sensitivity at high mass resolution (60,000) and detects molecular masses up to 2300 Da at the maximum accelerating voltage of 10 keV. It accommodates GC and LC interfaces with a variety of ionization modes and can be configured for MS/MS. The MStation uses a Hewlett Packard 9000-700 series EWS to control the instrument and provide data acquisition and reduction. The fully automated system can complete autotuning and resolution adjustment to maintain optimum performance. The Complement software has been converted to a fully X-windows compatible software platform, allowing the user to employ a wider variety of programs for data analysis. The mass analyzer system consists of an ion optics system with a 5:1 image-to-magnification ratio. This design allows for the use of wide en-
trance slits while focusing ions with nonoptimal trajectories. Because higher order aberrations are optimized, high resolution can be obtained without complicated manual adjustment of the instrument ion optical elements. The spectrometer accommodates ion sources such as EI, CI, FAB, and FD. A frit-FAB probe is used with a splitter as an interface for LC/MS of nonvolatile and thermolabile compounds, and a frit-CI probe is offered for LC/MS of volatiles. The system also offers two types of GC/MS
Calorimetry High-pressure cell for differential scanning Near-IR calorimetry accommodates pressures up The MLA 8100 is a near-IR spectrophoto 42 bar (600 psi) for applications such as tometer with an acoustooptic tunable filter. stability testing of polymers, oils, lubriThe solid-state analyzer, with no moving cants, and greases. The cell is a standparts, is designed for determining multialone accessory that connects directly to ple analytes in liquids. Applications inthe standard sample holder connector on clude determination of the water content DSC-7, DSC-4, and DSC-2 differential scanof organic solutions, octane number meaning calorimeters. Perkin Elmer surement, solvent recovery, textile dye • 402 composition, and milk composition. A fiber-optic cable permits samples to be Gravimetry placed at a distance away from the anaThe IGA automated gravimetry analyzer, lyzer. The analyzer is not sensitive to am- designed for studying gas-solid reactions, bient temperature changes and has self- is PC controlled and can be programmed checking diagnostics. It provides sepaby users to perform multiple measurerate analog outputs for each compound ment protocols over periods of days or being monitored and can be interfaced weeks. The analyzer incorporates a reacwith a remote PC. Rosemount tor vessel designed to UHV standards with Analytical • 401 an operating pressure range from INSTRUMENTATION
816 A
Analytical Chemistry, Vol. 66, No. 15, August 1, 1994
sample inlet systems, a jet separator for packed columns, and a directcoupling interface for capillary columns. The GC/MS inlet can be left in place while the LC/MS interface is connected to the front of the ion source. The spectrometer can also be configured for MS/MS by using either linked scans or alternative instrument configurations such as hybrid or tandem systems. The gas collision cells can operate at potentials from ground potential to floating ±10 keV for examination of collisions at low or high energies. JEOL • 403
10"6 mbar to 20 bar and with control options for temperatures from -150 °C to 1000 °C. A liquid nitrogen Dewar can be placed around the sample reactor for surface area/pore volume determination. The on-board computer can be interfaced with a PC for data analysis, and the analyzer can be coupled with a downstream mass spectrometer for evolved gas composition analysis. Hiden Analytical • 404 LITERATURE Thermal desorption for GC Brochure describes the Model TD-2 short-path thermal desorption system for GC, GC/MS, and GC/FT-IR. Topics include theory of operation, direct thermal desorption applications, and purge-and-
