10min:

SUSANNA L. WIDICUS, Division of Chemistry, California Institute of Technology, Pasadena, CA 91125; BRIAN J. DROUIN, California Institute of Technology, Jet Propulsion Laboratory, Microwave Millimeter and Submillimeter Spectroscopy Lab, Pasadena, CA 91109; KATHRYN A. DYL AND GEOFFREY A. BLAKE, Division of Geology and Planetary Science, California Institute of Technology, Pasadena, CA 91125.

The rotational spectrum of aminoethanol (NH₂CH₂CH₂OH) has been characterized in the 75 -- 120 GHz region using the 1-meter flow cell apparatus at the Jet Propulsion Laboratory. Previous studies of the rotational spectrum of aminoethanol in the 8 -- 40 GHz region probed the ground state to the J = 8 level and included determination of the dipole moment and rotational constants. Fourth-order centrifugal distortion constants were subsequently determined from these data. We present here extended measurements of the ground state transitions up to J = 51, as well as ₂₇=1 transitions up to J = 50, ₂₆=1 transitions up to J = 35, and ₂₅=1 transitions up to J = 29. Rotational transitions from the ₂₇=2, ₂₆=2, and ₂₅=2 states as well as three combination bands have also been assigned. Spectroscopic parameters, including standard rotational constants and fourth- and sixth-order centrifugal distortion constants, were determined using the SPFit/SPCat program suite.