A study of the rotational-torsional spectrum of hydrogen peroxide between 80 and 700 GHz

One hundred and thirty-three new rotational transitions that occur between pairs of torsional sublevels in the ground vibrational state of hydrogen peroxide have been measured in the 80 to 700 GHz region of the spectrum. These data, in combination with the 50 previously measured lines, have been theoretically analyzed to within the expected experimental uncertainty (?0.1 MHz). The rotational constants for the τ = 1, 2 state are (in MHz): A = 301 878.857 ± 0.015, B = 26 211.9019 ± 0.0059, C = 25 099.1400 ± 0.0059, and for the τ = 3, 4 state: A = 301 583.825 ± 0.075, B = 26 156.337 ± 0.13, C = 25 185.771 ± 0.13. The splitting between the torsional levels is 342 885.03 ± 0.05. These measurements and analysis accurately characterize the nine branches that make substantial contributions in the spectral region below 700 GHz.