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Sensitivity Issues in Step-Scan FT-IR Spectrometry

Traditionally, the SNR of spectra measured by step-scan FT-IR has been poor. We have accepted the penalty because step-scan allowed access to time-resolved spectroscopy on a wide range of time scales. Further, the alternative rapid-scan techniques such as stroboscopic and asynchronous sampling are susceptible to the same noise sources as step-scan. The bottom line is that the SNR of rapid-scan instruments is 1 to 100 times better for the same data collection time.

 
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