Study on tera-hertz time-domain spectroscopy of three kinds of pyrotechnic oxidants

The absorption spectra of pyrotechnics oxidants of KClO ₃, KClO ₄ and KNO ₃, in the frequency range between 0.2 and 2.5 THz, are calculated using quantum chemistry method. The experimental result obtained from THz time-domain spectroscopy system gives the detailed localities of the characteristic peaks of concerned oxidants. The experiment also provides the absorption spectrum of pyrotechnics which contains KClO ₄ between 0.2 and 2.5 THz. The characteristic peak of KClO ₃ is located at 2.4 THz. The characteristic peaks of both KClO ₄ and pyrotechnics which contain KClO ₄ are located at 2.0 and 2.2 THz. The characteristic peaks of KNO ₃ are located at 1.8 and 2.3 THz. Compared with experiment results, all the evidences indicate that KClO ₃, KClO ₄ and KNO ₃ have distinct characteristic spectroscopic peaks, which agree with the results of analog calculation.