Knowledge Bank

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 $constants.a$ Fourth-order centrifugal distortion constants were subsequently determined from these $data.b$ We present here extended measurements of the ground state transitions up to $J=51$, as well as $\nu 27=1$ transitions up to $J=50,\nu 26=1$ transitions up to $J=35$, and $\nu 25=1$ transitions up to $J=29$. Rotational transitions from the $\nu 27=2,\nu 26=2$, and $\nu 25=2$ 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.