Modification of time-resolved step-scan and rapid-scan FTIR spectroscopy for modulation spectroscopy in the frequency range from Hz to kHz

Physics – Condensed Matter

Scientific paper

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Infrared Spectrometers, Auxiliary Equipment, And Techniques, Time-Resolved Optical Spectroscopies And Other Ultrafast Optical Measurements In Condensed Matter

Scientific paper

Interleaved Rapid-Scan (continuous scan) and time-resolved Step-Scan techniques were modified in order to use these techniques for modulation experiments. The demodulation of the time-resolved spectra was done by software, replacing expensive Lock-In amplifiers. The new techniques lead to the same results compared to conventional Lock-In Step-Scan methods but show dramatically shortened measurement times with respect to the same signal-to-noise ratio.

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