Abstract
The rotational spectrum of diazomethane, H 2CNN, was investigated in the frequency range 100 to 400 GHz. Due to the C 2 v symmetry of the molecule, which is planar, only a-type dipole transitions were observed. The measurements were analyzed using Watson's S-reduced Hamiltonian. A detailed centrifugal distortion analysis yielded the following rotational and quartic centrifugal distortion constants: A = 272 979.1(8.1) MHz, B = 11 305.42697(45) MHz, C = 10 845.22028(47) MHz, D J = 4.14620(74) kHz, D JK = 396.817(92) kHz, D K = 22.0 MHz (fixed), d 1 = −192.55(42) kHz, d 2 = −57.27(39) Hz. Some sextic and higher-order distortion constants were determined and are discussed.
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