Page 165 - Tandem Techniques
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Page 148
cage of solid argon and, as the argon insulates the sample from the gold surface, there can be no
catalyzed decomposition, or molecular rearrangement. The carrier gas is removed by a low-pressure
turbo-molecular pump that contains no oil, and thus eliminates the possibility of any long-term sample
contamination.
Figure 4.14
The Mattson GC/IR Cryostatic TM Interface
Courtesy of Mattson Instruments Inc.
Due to the extremely inert condition of the trapping system, the samples can be held for a very long
time on the drum without loss or change. Consequently, the spectrum of any particular sample can be
taken repeatedly, any number of times, to improve the signal-to-noise ratio and thus the overall
sensitivity.
