Abstract
Hyperfine structure in the 313→303 rotation—inversion transition of deuterated ammonia NH2D at 18 807.7 Mc/sec has been studied with a beam maser microwave spectrometer giving a linewidth of 7 kc/sec. All details of the observed hyperfine structure have been accounted for in terms of the various quadrupole, spin—rotation, and spin—spin interactions of the four coupling nuclei. The hyperfine coupling constants which have been determined with the aid of a digital electronic computer are, for the 313 state: (eqJQ)D=—62.5±1.0 kc/sec, CD=—2.7±0.3 kc/sec, CH=—13.6±0.5 kc/sec; and for the 303 state: (eqJQ)D=—73.9±1.0 kc/sec, CD=—2.7±0.3 kc/sec, CH=—12.3±0.5 kc/sec. On the assumption that the electric field at the deuteron is cylindrically symmetric about the N—D bond direction ξ, we find that (eVξξQ)D=282±12 kc/sec, or Vξξ=1.38±0.06×1015 statV/cm2, where Vξξ is the second derivative of the electrostatic potential along ξ.
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