Journal ArticleDOI
Photoinduced Chemical Dynamics of High-Spin Alkali Trimers
John B. Higgins,Carlo Callegari,James Reho,Frank Stienkemeier,Wolfgang Ernst,Kevin K. Lehmann,Maciej Gutowski,Giacinto Scoles +7 more
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TLDR
In this article, a nanometer-sized helium droplets were used as an inert substrate on which to form spin-3/2 (quartet state) trimers, which undergo intersystem crossing to the doublet manifold and then dissociation into an atom and a covalently bound singlet dimer.Abstract:
Nanometer-sized helium droplets, each containing about 10 4 helium atoms, were used as an inert substrate on which to form previously unobserved, spin-3/2 (quartet state) alkali trimers. Dispersed fluorescence measurements reveal that, upon electronic excitation, the quartet trimers undergo intersystem crossing to the doublet manifold, followed by dissociation of the doublet trimer into an atom and a covalently bound singlet dimer. As shown by this work, aggregates of spin-polarized alkali metals represent ideal species for the optical study of fundamental chemical dynamics processes including nonadiabatic spin conversion, change of bonding nature, and unimolecular dissociation.read more
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Superfluidity Within a Small Helium-4 Cluster: The Microscopic Andronikashvili Experiment
TL;DR: The infrared spectrum of single oxygen carbon sulfide (OCS) molecules was measured inside large superfluidpure helium-4 droplets and nonsuperfluid pure helium-3 droplets, and it appears that 60 is the minimum number needed for superfluidity.
Journal ArticleDOI
Spectroscopy of atoms and molecules in liquid helium
J. P. Toennies,Andrey F. Vilesov +1 more
TL;DR: Within the past three years, a wide variety of molecules, ranging from OCS to large organic molecules such as amino acids and a number of van der Waals complexes and even large metal clusters, have been embedded in He droplets and studied either in infrared or in the visible region.
Journal ArticleDOI
Mechanism of host-guest complexation by cucurbituril.
TL;DR: The factors affecting host-guest complexation between the molecular container compound cucurbit[6]uril (CB6) and various guests in aqueous solution are studied, and a detailed complexation mechanism in the presence of cations is derived.
Journal ArticleDOI
Infrared spectroscopy of helium nanodroplets: novel methods for physics and chemistry
Myong Yong Choi,Gary E. Douberly,Travis M. Falconer,William K. Lewis,C. M. Lindsay,Jeremy M. Merritt,Paul L. Stiles,Roger E. Miller +7 more
TL;DR: In this article, it was shown that the helium nanodroplet spectra often resemble the corresponding gas-phase results for rotational spectroscopy, with the effects of the solvent being to...
References
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Molecular Reaction Dynamics and Chemical Reactivity
TL;DR: In this article, the authors deal with the molecular-level mechanism of elementary chemical reactions, and progress from the basic principles of physical chemistry to up-to-date research results to provide an understanding of chemical reactivity and physical rate processes from the fundamental point of view of atom-atom interactions all the way to the description of catalysis.
Journal ArticleDOI
Rotationally Resolved Spectroscopy of SF6 in Liquid Helium Clusters: A Molecular Probe of Cluster Temperature.
TL;DR: A rotationally resolved infrared spectrum has been obtained for S${\mathrm{F}}_{6}$ molecules captured inside of helium clusters of approximately 4000 atoms in this article, where the spectrum is interpreted in terms of a spherical top Hamiltonian.
Journal ArticleDOI
Quantum chemistry of small clusters of elements of groups Ia, Ib, and IIa: fundamental concepts, predictions, and interpretation of experiments
Journal ArticleDOI
An analysis of the B 1Πu–X 1∑+g band system of Na2
P. Kusch,M. M. Hessel +1 more
TL;DR: In this paper, a critical analysis of the B 1 Πu −X 1 Σ+g band system of the Na2 molecule has been made and the coefficients in a Dunham expansion that replicates the frequencies of 12 591 lines that originate in 1297 different V′, J′ levels with an rms deviation between the observed and calculated frequencies of 0.011 cm−1.
Journal ArticleDOI
Infrared spectroscopy at the surface of clusters: SF6 on Ar
TL;DR: In this article, a photodissociation spectroscopy technique was used to obtain infrared spectra of molecules adsorbed on the surface of clusters, based on a simple but effective way to prepare mixed clusters.
Related Papers (5)
Rotationally Resolved Spectroscopy of SF6 in Liquid Helium Clusters: A Molecular Probe of Cluster Temperature.
Superfluidity Within a Small Helium-4 Cluster: The Microscopic Andronikashvili Experiment
Nonequilibrium Self-Assembly of Long Chains of Polar Molecules in Superfluid Helium
K. Nauta,R. E. Miller +1 more