MILLIMETER SUBMILLIMETER-WAVE SPECTRUM OF THE FIRST EXCITED TORSIONALSTATE IN HOOH/

The millimeter and submillimeter (mm/submm)-wave spectrum of hydrogen peroxide has been extended to include the first excited torsional stat e, n = 1. The 135 newly assigned rotational transitions within the n = 1 torsional state range from K-a = 2 to 9 and up to J = 30. Sixty-sev en new observations in n = 0, which include rotational quantum numbers up to J = 47 and K-a = 5, supplement the previously measured 349 tors ional ground state transitions. All of the observed mm/submm-wave tran sitions within the n = 0 and 1 torsional states, as well as recent inf rared data, have been fit simultaneously to their respective experimen tal uncertainties using a Watson-type Hamiltonian for each of the tors ional states, tau. A Fermi interaction between the torsional levels in n = 0, 1, and 2 has been included. (C) 1995 Academic Press, Inc.