IR SPECTROSCOPIC STUDY OF H2O2, HDO2, AND D2O2 ISOLATED IN AR, KR, AND XE MATRICES

The vibrational spectrum of hydrogen peroxide, released from an urea h ydrogen peroxide adduct compound, is studied in Ar, Kr, and Xe matrice s. The gaseous products of the thermal decomposition of urea hydrogen peroxide in an argon atmosphere are determined using a low-resolution fast scanning FTIR-gas analyzer. Upon the solid sample being warmed to temperatures of similar to 90 degrees C, only hydrogen peroxide is de tected, and above that, NH3 and HNCO are evolved due to the decomposit ion of urea. The hydrogen peroxide-rare gas matrices are prepared from urea hydrogen peroxide by sweeping Ar, Kr, or Xe gas over the solid s ample kept at a suitable temperature. The ratio between trapped monome r and multimers can be controlled by varying the amount and the temper ature of the sample and the gas flow rate. The results show that urea hydrogen peroxide is a convenient source of pure hydrogen peroxide for spectroscopic studies. The IR spectra of H2O2, HDO2, and D2O2 in argo n matrices are presented and compared with previous results. The krypt on and xenon spectra are presented for the first time. Many of the pea ks show a well-resolved doublet structure.