Jet-FTIR Spectroscopy at Step-Scan Mode

We developed a new step-scan Fourier transform infrared (FTIR) spectrometer combined with a pulsed supersonic nozzle system. A pulsed supersonic jet is an excellent technique to produce rotationally cold molecules and van der Waals complexes, and also provides collision-free conditions which is realized in the interstellar medium (ISM). FTIR spectrometer is a useful method which can obtain high wavenumber resolution as well as the wide wavenumber coverage in a single measurement. In order to synchronize with the pulsed nozzle, FTIR spectrometer is run in step-scan mode. Recently we have applied jet-FTIR spectroscopy to observe the infrared absorption spectra of large molecular clusters such as (C2H2)n and (C6H6)n.
In future experiments, the present system will be applicable with minor modification to time-resolved jet-FTIR emission spectroscopy combined with pulsed discharge and/or pulsed laser as excitation source.




Jet-FTIR spectrometer



Schematic diagram of the experimental apparatus (Click on the figure to enlarge)



Infrared absorption spectra for C2H2 monomer and clusters

Reference: S. Hirabayashi and Y. Hirahara, Chem. Phys. Lett. 361, 265 (2002).

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