The anisotropic potential energy surfaces of H<sub>2</sub>, N<sub>2</sub>, and Ar with C<sub>2</sub>H<sub>2</sub>from total differential scattering experiments
作者:Moonbong Yang、Robert O. Watts
DOI:10.1063/1.466400
日期:1994.3
The total differential scattering cross sections for H2, N2, and Ar with C2H2 were measured on an in-plane crossed molecular beam apparatus at collision energies of 1051, 1056, and 929 K, respectively. Well resolved rainbow oscillations for N2 and Ar, and diffraction oscillations for H2, showed two interference effects. Effective spherical and anisotropic potentials were obtained from analysis using single channel and infinite-order-sudden (IOS) methods, based on the semiclassical Jeffreys–Wentzel–Kramers–Brillouin (JWKB) approximation. The damping of oscillations showed the importance of anisotropy in the pair potentials. Total differential scattering cross sections calculated using the IOS method were in excellent agreement with the experimental data.
Structure and properties of the argon⋅acetylene van der Waals molecule
作者:Robert L. DeLeon、J. S. Muenter
DOI:10.1063/1.439056
日期:1980.6
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 (√<cos2ϑ≳)=72(1)° for the complex.