THE ROTATIONAL SPECTRUM OF FLUORONIUMYL ($HF^{+}$)

Author Institution: Department of Chemistry, University of California; Zum Pfarrhag 2, 6238 Hofheim 6, West Germany; Instituto de Fisica, Universidade Estadual de Campinas, Brazil; Herzberg Institute for Astrophysics, National Research Council, CanadaWe have recently measured the rotational spectrum of $X^{2}\Pi HF^{+}$ by laser magnetic resonance; this measurement continues our study of the hydrogen halide ion series $(HCl^{+}, HBr^{+}\ldots)$. $\Lambda$-doubling and hyperfine structure from the halide nucleus was resolved in each case; for $HF^{+}$, hydrogen hyperfine structure was observed as well. The magnetic resonance rotational transitions, augmented by combination differences from optical data, were analyzed using a Zeeman Hamiltonian in a single, weighted least squares fit. Eight molecular constants were determined. Current work is directed towards measuring the rotational spectrum of $DF^{+}$