Gerald T. Fraser coauthored validation of Fourier-transform microwave spectroscopy for trace-gas measurements. The instrument combines controlled excitation and molecular expansion with a rotational spectroscopic readout.
Changing carrier conditions can change the sampled populations, so an instrument's sensitivity must be separated from the chemical composition presented to it.[ref]
The Validation of Fourier-Transform Microwave Spectroscopy for Trace-Gas Analysis. Printed pages 25–27, apparatus and nozzle comparisons
Identity source: www.nist.gov/people/gerald-t-fraser
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