Nuclear Quadrupole Hyperfine Structure of the Direct /-Type Transitions
نویسنده
چکیده
The direct Itype transitions of H l 3 C , 4 N l 6 0 in the vibrational states ( i^ i ' s ) = (01) and (03) were measured in the frequency range from 18 to 40 GHz. These transitions show a nuclear quadrupole hyperfine structure caused by the l 4 N nucleus, which could partially be resolved at Doppler-limited resolution. The analogous transitions of the parent species. H l 2 C l 4 N 1 6 0 , were remeasured. They displayed a very similar hyperfine structure, also partially resolved. The hyperfine patterns of both H l 2 C l 4 N l 6 0 and H 1 3 C 1 4 N 1 6 0 were analysed by means of contour fitting s to the absorption profiles. The parameter l ^eQq , which is responsible for the splittings, is determined to be 645(20) kHz for the vibrational state (01) and 890(44) kHz for the vibrational state (03) for H l 2 C l 4 N l 6 0 and 642(32) kHz for (01) and 898(22) kHz for (03) for H 1 3 C l 4 N 1 6 0 . This unexpectedly large splitting parameter for states involving the large amplitude motion (HCN bending) is discussed as another consequence of the quasilinearity of fulminic acid, in view of the fact that the analogous transitions for the vibrational state (10) (NCO bending) do not split or even show a significant line broadening at the resolution used for the present measurements.
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