Abstract: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-… Show more
“…As the slow rotations that have just been reviewed, the hindered rotations in molecular complexes are likely perturbed by the nonsuperfluid component of the complex. With collaborators, we have explored this issue both experimentally and theoretically by considering C 2 H 2 -Ne, Ar and Kr complexes, 187,188 . The (C 2 H 2 ) 2 dimer has been studied also.…”
Section: Hampered Deformations Of Molecular Complexes Hosted In Heliu...mentioning
This perspective article reviews experimental and theoretical works where rare gas clusters and helium nanodroplet are used as nanoreactor to investigate chemical dynamics in a solvent environment. A historical perspective...
“…As the slow rotations that have just been reviewed, the hindered rotations in molecular complexes are likely perturbed by the nonsuperfluid component of the complex. With collaborators, we have explored this issue both experimentally and theoretically by considering C 2 H 2 -Ne, Ar and Kr complexes, 187,188 . The (C 2 H 2 ) 2 dimer has been studied also.…”
Section: Hampered Deformations Of Molecular Complexes Hosted In Heliu...mentioning
This perspective article reviews experimental and theoretical works where rare gas clusters and helium nanodroplet are used as nanoreactor to investigate chemical dynamics in a solvent environment. A historical perspective...
“…(d) Taken from Ref. 5 . fact with the angular basis vectors built from C 2 H 2 rotation lev-els of high j.…”
Section: Spectra Of Free 1:1 Complexesmentioning
confidence: 99%
“…This issue was addressed in the Saclay laboratory for the C 2 H 2 −Ne complex in a work that associates HENDI spectroscopy with a theoretical modeling of the C 2 H 2 −Ne deformation dynamics. 5 Hereafter, this work is referred to as Paper I. It explored the deformation of the complex when the C 2 H 2 moiety is vibrationally excited in the vicinity of the ν 3 /ν 2 + ν 4 + ν 5…”
Near-infrared spectroscopy of the C2H2–Ar, Kr complexes was performed in the spectral region overlapping the ν3/ν2 + ν4 + ν5 Fermi-type resonance of C2H2. The HElium NanoDroplet Isolation (HENDI) technique was used for this purpose.
“…The Ne-C 2 H 2 complex was explored first in a work which combines high resolution IR-HENDI-spectroscopy and numerical simulations. 10 The simulations are based on closecoupling calculations to derive the bound states of the Ne-C 2 H 2 complex. Then, the dynamical effect of the helium environment is modeled phenomenologically in the same spirit as recalled above for molecular rotations.…”
Section: Introductionmentioning
confidence: 99%
“…A side results in ref. 10 concerns spectra where acetylene only is present in the droplet. Close to lines assigned to the low energy component of the n 3 /n 2 + n 4 + n 5 Fermi dyad of the C 2 H 2 monomer, bands assigned to the K a (2 ' 1), K a (1 ' 0) and K a (0 ' 1) transitions of the dimer (C 2 H 2 ) 2 were observed.…”
The CH antisymmetric stretch of the CH moieties in acetylene dimers was explored over the range 3270-3290 cm 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.
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