Analytical Spectroscopy
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A resurgence of interest in spectroscopic sensors has been fueled by increases in performance made possible by advances in laser systems and applications in medicine, environmental monitoring and national security [1].
SMM sensors based on electronic frequency synthesis and frequency multiplication are comparable to their optical counterparts [1]. Systems based on pulsed lasers and difference frequency mixing have also been reported. If the sensitivity figure of merit is amount of sample, the lower optimum pressure (~10 mTorr) of SMM sensors increases their sensitivity by two to five orders of magnitude relative to Op/IR sensors or sensors based on SMM system with lower resolution.
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