Large amplitude motion of the acetylene molecule within acetylene–neon complexes hosted in helium droplets

M. Briant (1, 2) , E. Mengesha (1, 2) , P. De Pujo (1, 2) , M.-A. Gaveau (1, 2) , B. Soep (1, 2) , J.-M. Mestdagh (2, 1) , L. Poisson (1, 2)

1 LIDYL - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
2 DyR - Dynamique Réactionnelle

Superfluid helium droplets provide an ideal environment for spectroscopic studies with rotational resolution. Nevertheless, the molecular rotation is hindered because the embedded molecules are surrounded by a non-superfluid component. The present work explores the dynamical role of this component in the hindered rotation of C2H2 within the C2H2–Ne complex. A HENDI experiment was built and near-infrared spectroscopy of C2H2–Ne and C2H2 was performed in the spectral region overlapping the ν3/ν2 + ν4 + ν5 Fermi-type resonance of C2H2. The comparison between measured and simulated spectra helped to address the above issue.

Domaines: Chimie théorique et/ou physique

M. Briant, E. Mengesha, P. De Pujo, M.-A. Gaveau, B. Soep, et al.. Large amplitude motion of the acetylene molecule within acetylene–neon complexes hosted in helium droplets . Physical Chemistry Chemical Physics, 2016, 18, pp.16414-16422. ⟨10.1039/C6CP02989B⟩. ⟨cea-01426380⟩