Abstract
Rotational spectra have been detected in each of two low-energy vibrational states (A and B) for both allene…HF and allene…DF by pulsed-nozzle, FT microwave spectroscopy. Analysis of nuclear hyperfine structure in the 1 01←0 00 transition of each state leads to the coupling constants D aa HF for allene…HF and χ aa D and D aa DF for allene…DF. Rotational constants A=9385(2), B=3722.479(26) and C=2697.449(24) MHz determined for state A of allene…HF are interpreted in terms of an L-shaped hydrogen-bonded geometry for the dimer.
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