Development of Time-Resolved Fourier Transform Infrared Spectroscopy and Applications to Interstellar Chemistry
By using a high-resolution spectrometer, a time-resolved Fourier transform infrared spectroscopic method has been developed with the help of a microcontroller SX and/or FPGA, where a maximum of 64 time-resolved data are recorded with a preset time interval in a single scan of the interferometer. This method has been applied to observations of infrared emission spectra from pulsed discharge products such as CN, He2, H3+, HNC/HCN. He2 in Rydberg states with higher energy than the b3Π state was found to be produced efficiently in afterglow plasma, and the quantum defect theory was applied to identification of each line in electronic states originated from 5f and 6f orbitals. From the observed time-profiles of emission lines of the H3+ ν2 band, the rate constant for recombination reaction of H3+ and electron has been estimated. The time-resolved system was also applied for emission lines from laser ablation products by using a high repetition rate Nd:YLF laser.
Keywords: Time-Resolved FT, Infrared Emission Spectra, CN Radical, He,2, H3+, laser ablation