Abstract
Time-resolved Fourier transform spectroscopy (TR-FTS) is reviewed, with emphasis on synchronous FTS using continuously scanning interferometers. By using a high-resolution Bruker IFS 120 HR, a TR-FTS method has been developed with the help of a microcontroller SX, where a maximum of 64 time-resolved data are recorded with a preset time interval in a single scan of the interferometer. The time resolution is 1 μs, limited by the response time of the detector system used. This method has been applied to a pulsed discharge in an Ar and H 2 mixture to observe time profiles of ArH + and ArH emission spectra. Electronic transitions of He 2 have been observed in the infrared region with this method, and from the time profiles, He 2 in Rydberg states with higher energy than the b 3Π state is found to be produced efficiently in afterglow plasma. Fifteen bands in the 2300–8000 cm −1 region have been assigned by using previously reported data from the optical region. A new band from the 5 f state has been assigned for the first time through the 5 f–4 d band in the 2600 cm −1 region.
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