Rotational Study of Carbon Monoxide Solvated with Helium Atoms

Surin, L. A.; Потапов, А. В.; Думеш, Б. С.; Schlemmer, S.; Xu, Yunjie; Raston, Paul L.; Jäger, Wolfgang

doi:10.1103/physrevlett.101.233401

Cited by 56 publications

(87 citation statements)

References 33 publications

(71 reference statements)

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“…The turn around of B with N was observed for the first time in 2003, with N 2 O as the dopent molecule. Since then, along with OCS [14] and N 2 O [2,3,[15][16][17][18][19][20], the vibrational and rotational spectra of several other molecules, e.g., HCCCN [9], CO 2 [31], CO [32], etc., for very small N, have also been reported.…”

Section: Experimental Studiesmentioning

confidence: 99%

Quantum dynamics of molecules in 4He nano-droplets: Microscopic superfluidity

et al. 2011

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High resolution spectroscopy of doped molecules in He nano-droplets and clusters gives a signature of superfluidity in microscopic system, termed as microscopic superfluidity. Ro-vibrational spectrum of HeN-M clusters is studied with the help of some important observations, revealed from experiments (viz., localised and orderly arrangement of He atoms, although, being free to move in the order of their locations; individual He atoms can not be tagged as normal/ superfluid, etc.) and other factors (e.g., consideration that the 4 4 4 4 4 He atoms which happen to fall in the plane of rotation of a molecule, render a equipotential ring and thus, do not take part in rotation; etc.) which effect the rotational and vibrational spectrum of the system. This helps us in successfully explaining the experimental findings which state that the rotational spectrum of clusters have sharp peaks (indicating that the molecule rotates like a free rotor) and moment of inertia and vibrational frequency shift have a non-trivial dependence on N.

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Section: Experimental Studiesmentioning

confidence: 99%

Quantum dynamics of molecules in 4He nano-droplets: Microscopic superfluidity

et al. 2011

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“…We note that the ∆J = 0, ±2 selection rule would be relaxed for symmetric top molecules and may indeed indicate the involvement of C 2 H 2 -(He) n clusters. However, the good match of these transitions with multiples of the b constant of free C 2 H 2 is difficult to explain considering that in other molecule-helium complexes such lines are always shifted 90 .…”

Section: Time-resolved Alignment and Fourier Transformationmentioning

confidence: 99%

Formation of coherent rotational wavepackets in small molecule-helium clusters using impulsive alignment

et al. 2014

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We show that rotational line spectra of molecular clusters with near zero permanent dipole moments can be observed using impulsive alignment. Aligned rotational wavepackets were generated by non-resonant interaction with intense femtosecond laser pump pulses and then probed using Coulomb explosion by a second, time-delayed femtosecond laser pulse. By means of a Fourier transform a rich spectrum of rotational eigenstates was derived. For the smallest cluster, C 2 H 2 -He, we were able to establish essentially all rotational eigenstates up to the dissociation threshold on the basis of theoretical level predictions. The C 2 H 2 -He complex is found to exhibit distinct features of large amplitude motion and very early onset of free internal rotor energy level structure.

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“…Such experiments are directed on the detection of a superfluid response of molecular rotation in helium clusters [6,7]. It was shown that the lighter probe molecules allow one to measure the effective inertia of He clusters while maintaining a maximum…”

Section: Introductionmentioning

confidence: 99%

Rotational spectrum of the NH₃–He van der Waals complex

Surin

Schnell

2016

EPJ Web Conf.

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Abstract.The interaction between ammonia and helium has attracted considerable interest over many years, partly because of the observation of interstellar ammonia. The rate coefficients of NH3-He scattering are an important ingredient for numerical modeling of astrochemical environments. Another, though quite different application in which the NH3-He interaction can play an important role is the doping of helium clusters with NH3 molecules to perform high-resolution spectroscopy. Such experiments are directed on the detection of non-classical response of molecular rotation in helium clusters addressing fundamental questions related to the microscopic nature of superfluidity. High-resolution spectroscopy on the NH3-He complex is an important tool for increasing our understanding of intermolecular forces between NH3 and He.The experimental spectra of NH3-He would be of great importance to test the accuracy of available potential energy surfaces used in the analysis of the role of resonances in low energy collisions [1,2]. The rate coefficients of NH3-He scattering are an important ingredient for numerical modeling of astrochemical environments. This is one of the reasons why NH3-He interactions have been studied experimentally and theoretically by several groups (see [1,2] and Refs. therein). Recently, a new four-dimensional potential energy surface (PES), based on a high-quality fit of 4180 ab initio points, was calculated [1]. The potential has a well depth of De = 35.08 cm , which is to be compared with the well depth of 33.46 cm −1 for the earlier potential of Hodges and Wheatley [3]. Although this difference is not very large, it was found that small differences in the potential can have profound consequences for the observed resonance structures at low scattering energies. High-resolution spectra of the NH3-He complex could be an additional test of the PES's quality, but these spectra have not been observed yet. High-resolution infrared and/or microwave spectra of the related NH3-Ar (see [4] and Refs. there) and NH3-Ne [5] in the gas phase have been reported, but no comparable data exist for helium.A very different experiment in which the NH3-He interaction plays an important role, is the trapping of NH3 molecules inside He nanodroplets to perform high resolution spectroscopy. Such experiments are directed on the detection of a superfluid response of molecular rotation in helium clusters [6,7]. It was shown that the lighter probe molecules allow one to measure the effective inertia of He clusters while maintaining a maximum

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Rotational Study of Carbon Monoxide Solvated with Helium Atoms

Cited by 56 publications

References 33 publications

Quantum dynamics of molecules in 4He nano-droplets: Microscopic superfluidity

Quantum dynamics of molecules in 4He nano-droplets: Microscopic superfluidity

Formation of coherent rotational wavepackets in small molecule-helium clusters using impulsive alignment

Rotational spectrum of the NH₃–He van der Waals complex

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Rotational Study of Carbon Monoxide Solvated with Helium Atoms

Cited by 56 publications

References 33 publications

Quantum dynamics of molecules in 4He nano-droplets: Microscopic superfluidity

Quantum dynamics of molecules in 4He nano-droplets: Microscopic superfluidity

Formation of coherent rotational wavepackets in small molecule-helium clusters using impulsive alignment

Rotational spectrum of the NH3–He van der Waals complex

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Rotational spectrum of the NH₃–He van der Waals complex