Abstract
Molecular beam electric resonance spectroscopy has been used to observe the P(16) e and P(16) f transitions in the ν 5- ν 4 band of dideutero acetylene. Hyperfine transitions were resolved in the P(16) e case, providing deuterium quadrupole coupling and spin rotation information. The hyperfine properties are essentially the same for ν 4, J = 16 and ν 5, J = 15 with eQq = 209(1) kHz and C = −0.42(2) kHz. This information is compared with other measurements of deuterium quadrupole coupling in acetylene.
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