High resolution vibrational overtone spectroscopy of hydrogen peroxide in the Δv=4 region

The vibrational overtone spectrum of H2 O2 vapor between 7400 and 7600 Å is recorded under both bulk gas and supersonic beam conditions. An absorption band corresponding to a Δv=4 O–H stretch is observed in this spectral region. Rotational analysis indicates that it is a hybrid band with mainly parallel character. In addition to the 59 rovibrational transitions that could be assigned to this band, another 83 lines are observed that did not fit an interpretable asymmetric rotor pattern. Spectral linewidths are found to be Doppler limited in all cases (7 MHz FWHM with the supersonic beam).