Structure and properties of the argon⋅acetylene van der Waals molecule

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Abstract
Radio frequency spectroscopy and Stark effect measurements have been carried out on Ar⋅HCCH and Ar⋅DCCD produced in acetylene seeded argon beams. Because of the very small electric dipole moment, μ=0.02697(3) D, only the 110–111 transition and low frequency pure Stark transitions were observed. Observations are only compartible with a T‐shaped equilibrium structure with an Ar to acetylene distance of 3.25(1)Å. Deuterium hyperfine data provide a 204.4(10) KHz value for eqQ of acetylene and arcos (√2ϑ≳)=72(1)° for the complex.