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Clearly resolved hyperfine structure has been observed in the extreme ultraviolet XUV  spectra of the C 1, v=0−X 1+, v=0 transition of H19F obtained through 1 XUV+1 UV resonance enhanced multiphoton ionization spectroscopy. The hyperfine splitting within the R-branch lines shows significant perturbations, which we attribute to mixing with the rotational levels of the nearby v=29 level of the B 1+ ion-pair state. A deperturbation analysis quantitatively explains the apparent variation of the fluorine magnetic hyperfine parameter aF, for which a value of 403483 MHz was obtained by averaging over the values derived from the R0–R4  lines, after correcting for the effects of the perturbations. © 2008 American Institute of Physics. DOI: 10.1063/1.300640

Observation of molecular hyperfine structure in the extreme ultraviolet: The HF C-X spectrum