Infrared high-resolution emission spectroscopy of metal compounds produced by laser ablation

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The purpose of this project is to test a new spectroscopic system for detecting infrared emission from metal compounds produced by laser ablation. Experiments are summarized as follows,(1) Construction of a grating spectrometer with an InSb array detectorThe spectrometer consists of a grating with the size of 120 x 140 mm, reflecting mirror, slits etc. A Czerny-Turner configuration was used. The spectrometer covers 1-5 μm with a relative resolution of 40,000. The read-out system for the array detector was constructed using multi-channel A/D board, clock generator, and driver board. The control was carried out by using a workstation SUN-IV.(2) Construction of vacuum chamber for laser ablation.The chamber installed a pulse nozzle, a metal rod with rotation mechanism, and pumped with a 10" diffusion pump. By observing the NィイD22ィエD2O signal millimeter wavelength region, it was conformed that the molecules were cooled down to about 50 K.(3) Observation of Low-temperature matrix isolation spectra.As a test of ablation, we observed the vibration spectra of carbon chain molecules CィイD23ィエD2, CィイD24ィエD2, CィイD25ィエD2, and CィイD212ィエD2 K Ar matrix, which was produced by the laser ablation from a carbon rod.(4) Construction of data acquisition system for Fourier transform spectrometer.We developed a new type data acquisition system for pulsed laser or pulse discharge by using a recently available a chip computer. A signal of He-Ne fringe from the FT spectrometer is used to produce a trigger for pulse laser or pulse discharge after processing by the chip computer, and a new data acquisition system was also arranged for the pulse laser usage.