15min:

K. KAWAGUCHI, A. FUJIMOTO, Department of Chemistry, Faculty of Science, Okayama University, Okayama 700-8530, Japan.

A continuously scanning FT spectrometer (Bruker IFS 120 HR) has been applied for observing time-resolved spectra after pulse phenomena by a multi-sampling method with a help of a chip computer SX. In the present study, we used a pulse discharge with a duration of 40 µsec in a mixture of N₂ (120 mTorr) and CH₄ (15 mTorr) to produce HNC and HCN emissions which were monitored by the ₁ bands (C-H stretch in HCN or NH stretch in HNC) with a resolution of 0.06 cm^-1. The cell was cooled down by liquid nitrogen or dryice. Thirty data were collected to produce 30 interferograms with a 2 µsec interval. The emission intensities from v₁ = 1 of HCN and HNC decreased for 15 µsec after turning off the discharge and increased later. The emission from v₁ = 2 of HCN showed similar time profile as the v₁ = 1 emission. However, the emission from v₂=2 of HNC showed a different time profile.