# HYPERFINE STRUCTURE OF ROTATION-INVERSION LEVELS IN THE EXCITED $\nu_{2}$ STATE OF AMMONIA

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 Title: HYPERFINE STRUCTURE OF ROTATION-INVERSION LEVELS IN THE EXCITED $\nu_{2}$ STATE OF AMMONIA Creators: Belov, S. P.; Winnewisser, G.; Urban, Š. Issue Date: 1997 Publisher: Ohio State University Abstract: Hyperfine structures of the rotation-inversion transitions with $J=3-2,s-a$, and $K = 0,1,2$, and with $J=0-1$, a-s, and K = 0 in the excited $\nu_{2}$ vibrational state have been resolved and measured by sub-Doppler saturation spectroscopy using the Cologne terahertz spectrometer with an accuracy of about 1 KHz. The line frequencies of the hyperfine structures of the rotation inversion transitions (at 466,769,742,and 763 GHz) have been simultaneously analyzed with the previously published $\nu_{2}$ transition J=2-1,s-a,K=1 in terms of effective nuclear quadrupole and spin-rotation parameters. In addition to those, the corresponding purely rotation-inversion frequencies deperturbed from the hyperfine effects have been derived. Description: Author Institution: I. Physikalisches Institut, Universitaet zu Koeln; J. Heyrovsky Institute of Physical Chemistry, Institute of Chemical Technology URI: http://hdl.handle.net/1811/13883 Other Identifiers: 1997-MI-05