ANALYSIS OF THE MICROWAVE SPECTRUM OF HYDRAZINE
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Date
1982
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Ohio State University
Abstract
Microwave measurements from 7 to 130 GHz, consisting of 444 rotational transitions in the ground vibrational state of hydrazine with $J \leq 31$ and $K_{a}\leq 6$ have been fit to an effective rotational Hamiltonian containing 9 asymmetric rotor constants, $14 NH_{2}$ inversion parameters, and 1 internal rotation parameter, with an overall standard deviation of the fit of 0.40 MHz. This set of parameters contains: (i) the three rotational constants; (ii) tunneling splitting constants for $NH_{2}$ inversion at one end of the molecule, for $NH_{2}$ inversion at both ends of the molecule, and for internal rotation through the trans barrier; (iii) three K-type doubling constants affecting the K=1 levels: (iv) an a-type Coriolis interaction with matrix elements linear in K; and (v) various centrifugal distortion corrections. A consistent group theoretical formalism has been used to label the energy levels and to select terms in the rotational Hamiltonian. The Hamiltonian matrix, which is set up in a tunneling basis set, is of dimension $16\times 16$ and contains only $\Delta |K| = 0$ matrix elements, asymmetric rotor effects being taken into account on the diagonal by a Polo expansion in $b^{n}$. Hyperfine interactions and force fields (barriers) have not been treated.