Microwave electric-resonance optothermal spectroscopy of (H2O)2

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Abstract
The microwave spectrum of (H2O)2 has been measured between 14 and 110 GHz using a newly developed electric‐resonance optothermal spectrometer (EROS) described here. The reported measurements extend previous results on the a‐type K a =0–0 and 1–1 bands for the A ± 2 , B ± 2 , and E ± rotational‐tunneling states and include the first observations of the c‐type K a =1–0 band for the A ± 2 and B ± 2 states and the a‐type K a =0–0 band for the A ± 1 states. For the A ± 1 states an interconversion tunneling splitting of 22.6 GHz is obtained, compared to the 19.5 GHz value found previously for the K a =0 A ± 2 and B ± 2 states.
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