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- W1988202205 abstract "The highly sensitive method of infrared-radiofrequency double resonance inside a CO2N2O laser cavity has been applied to the observation of “pure” nuclear quadrupole resonance and direct A1-A2 transitions of CH3Br. More than 150 quadrupole resonances have been observed for 12CH379Br, 12CH381Br, 13CH379Br, and 13CH381Br using direct double resonance as well as collision-induced satellites. Accurate hyperfine constants, i.e., the quadrupole coupling constant eqQ and its rotational dependence χJ and χK, Hougen's coefficient χd, and the spin-rotation constants CN and CK have been determined for the ground state. The eqQ in the excited states ν3, ν6, ν3 + ν6, and 2ν6 have also been determined. About 60 direct l-doubling transitions have been observed, which has enabled us to determine the l-doubling constant qv(1,1), its rotational dependence δqvJ(1,1) and the asymmetry parameter for the quadrupole coupling constant eqQη for the ν6 and ν3 + ν6 states. A set of direct A1-A2 transitions in the 2ν6 state with K = 1 and l6 = −2 and that in the ν6 state with K = 2 and l6 = −1 have been observed. The rovibrational and isotope assignments of the observed A1-A2 are helped by the existence of quadrupole hyperfine structure and many collision-induced satellites. The rovibrational assignments of CH3Br transitions which are coincident with laser lines are summarized." @default.
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- W1988202205 date "1980-07-01" @default.
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- W1988202205 title "Radiofrequency spectroscopy inside a laser cavity: Nuclear quadrupole resonance and A1-A2 splitting of CH3Br" @default.
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- W1988202205 doi "https://doi.org/10.1016/0022-2852(80)90099-5" @default.
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