Dynamics of acetylene dimers hosted in helium droplets
M. Briant, E. Mengesha, M. A. Gaveau, B. Soep, J. M. Mestdagh and L. Poisson
Phys. Chem. Chem. Phys., 20, 2597, 2018 [doi]
The CH antisymmetric stretch of the C2H2 moieties in acetylene dimers was explored over the range 3270-3290 cm-1 using the helium nanodroplet isolation (HENDI) technique. This work is part of a general investigation which addresses the dynamical consequences of coupling the deformation motions of weakly bound complexes with a finite size quantum liquid (the helium droplet). The acetylene dimer is attractive from this point of view because one of its deformation coordinates promotes a tunneling isomerization process. A numerical simulation of the observed spectrum allows deriving a set of effective spectroscopic constants which help understanding the dynamical role played by the droplet on the rotation and deformation of the dimer.