Millimeter and submillimeter wave rotational transitions have been measured for different isotopic species of arsine and stibine from which accurate values of the rotational constants, including centrifugal stretching constants, nuclear quadruple and nuclear magnetic coupling constants, were obtained. Results (in Mc/sec) are for ' AsH3, Bp=

Articles you may be interested inMicrowave spectrum, structure, dipole moment, and deuterium nuclear quadrupole coupling constants of the acetylene-sulfur dioxide van der Waals complex J. Chem. Phys. 94, 6947 (1991); 10.1063/1.460228 8 3Kr nuclear quadrupole coupling, microwave spectrum, and structure of KrHCN J. Chem. Phys. 78, 3483 (1983); 10.1063/1.445171Nuclear quadrupole coupling constants of cispropylene imine from the microwave spectrum

The microwave spectrum of propylene imine has been investigated in the range 9–40 GHz. The rotational constants associated with two species of molecules were found to be 16 893.00, 6533.71, and 5761.26 MHz for the trans isomer and 16 665.66, 6558.64, and 5812.36 MHz for what is probably the cis isomer. The dipole-moment components for the trans isomer were found to be μa = 0.21±0.06, μb = 0.81±0.03, and μc = 1.36±0.02 D, and for the other species of molecule, μa = 1.28±0.01, μb = 0.95±0.08, and μc = 0.78±0.08 D.

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The microwave spectrum of trans-propyleneimine has been studied in the ground state and the first excited state of the methyl torsion. Ground-state rotational constants for the normal isotopic species and for the C3H6N—D species are as follows: A = 16 892.59, B = 6533.63, C = 5761.37 and A = 16 082.31, B = 6338.70, C = 5537.81 MHz, respectively. The height of the barrier to internal rotation has been found to be 2608±26 cal/mole by analysis of splittings of ground-state and first excited-state lines. Measurements of the Stark effect have led to a total dipole moment of 1.57 D, and analysis of hyperfine structure has given the quadrupole coupling constants of the 14N nucleus: χaa=0.67±0.02, χbb=2.24±0.02, χcc=−2.91±0.01 MHz. An estimate has been given of the quadrupole coupling constants in the principal axis system of the electric-field-gradient tensor, and the molecular structure has been discussed.