Infrared spectroscopy of water clusters co-adsorbed with hydrogen molecules on a sodium chloride film

Yamakawa, Koichiro; Fukutani, Katsuyuki

doi:10.1016/j.chemphys.2016.02.023

Cited by 11 publications

(5 citation statements)

References 33 publications

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“…In each of these studies, an infrared band was observed within the range of 3200−3230 cm −1 and was attributed to cage hexamer. However, as was pointed out, 10 this assignment to the cage isomer is not compatible with a recent detailed calculation, which showed that the cage hexamer has relatively strong absorption bands around 3400 and 3600 cm −1 in addition to the most intense one below 3200 cm −1 . 22 The 3218 cm −1 band is more likely to originate from the book or bag hexamer because spectra of these isomers have relatively suppressed absorption intensities in the OH stretch region except for ∼3200 cm −1 .…”

Section: -4contrasting

confidence: 77%

“…On the other hand, Yamakawa and Fukutani measured infrared spectra of water clusters in an adsorption layer of H 2 on a deposited NaCl film, and successfully detected infrared absorption due to the two-dimensional matrix of H 2 in addition to that due to the clusters. 10 The application of methane to the matrix species is promising because its infrared-active property and chemical inertness enable one to investigate the structure of the matrix as well as water clusters. A methane molecule does not have the electric dipole nor quadrupole owing to the high symmetry of T d .…”

Section: Introductionmentioning

confidence: 99%

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Infrared spectroscopy of water clusters isolated in methane matrices: Effects of isotope substitution and annealing

et al. 2016

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Using infrared-active solvents of CH4 and CD4 for matrix isolation, we measured infrared spectra of H2O and D2O clusters at 7 K. The solute-concentration dependence of the spectrum of H2O clusters in a CH4 matrix was investigated and was used for the peak assignment. Annealing procedures were found to promote the size growth of water clusters in methane matrices for all the combinations of (H2O, CH4), (H2O, CD4), (D2O, CH4), and (D2O, CD4). We also monitored the ν3 absorption due to methane to find the annealing-induced structural change only of solid CH4. The matrix effects on the vibrations of the clusters are discussed on the basis of “Tc plots”, where their frequencies are plotted as a function of the square root of the matrix critical temperature, Tc. The obtained plots assure the validity of the assignment of the cluster peaks.

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Section: -4contrasting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Infrared spectroscopy of water clusters isolated in methane matrices: Effects of isotope substitution and annealing

et al. 2016

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“…12 Yamakawa et al measured infrared spectra of H 2 O clusters in a two-dimensional H 2 matrix on a NaCl film with raising the substrate temperature, and quantitatively analyzed the cluster-size distribution. 17 In order for the detailed investigation of the pure effect of annealing on the cluster-size distribution, we should distinguish spectral changes irreversible with temperature from reversible ones such as the peak shift and broadening. However, there have been no reports on infrared spectra of matrix-isolated water clusters measured at a fixed temperature after heating at systematically varied temperatures.…”

Section: Introductionmentioning

confidence: 99%

D2O clusters isolated in rare-gas solids: Dependence of infrared spectrum on concentration, deposition rate, heating temperature, and matrix material

2018

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The infrared absorption spectra of D2O monomers and clusters isolated in rare-gas matrices were systematically reinvestigated under the control of the following factors: the D2O concentration, deposition rate, heating temperature, and rare-gas species. We clearly show that the cluster-size distribution is dependent on not only the D2O concentration but also the deposition rate of a sample; as the rate got higher, smaller clusters were preferentially formed. Under the heating procedures at different temperatures, the cluster-size growth was successfully observed. Since the monomer diffusion was not enough to balance the changes in the column densities of the clusters, the dimer diffusion was likely to contribute the cluster growth. The frequencies of the bonded-OD stretches of (D2O)k with k = 2-6 were almost linearly correlated with the square root of the critical temperature of the matrix material. Additional absorption peaks of (D2O)2 and (D2O)3 in a Xe matrix were assigned to the species trapped in tight accommodation sites.

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“…Therefore, the role of phonons in energy relaxation should be considered. In order to discuss the influence of the solid phonons in the conversion process, let me return to the interpretation of the steep temperature dependence of the conversion rate on the ASW surfaces at very low temperature, as measured in 2013-6 by the Japanese teams [154,155].…”

Section: Thermal Accommodations In Nano-cagesmentioning

confidence: 99%

Hydrogen Conversion in Nanocages

Ilisca

2021

Hydrogen

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Hydrogen molecules exist in the form of two distinct isomers that can be interconverted by physical catalysis. These ortho and para forms have different thermodynamical properties. Over the last century, the catalysts developed to convert hydrogen from one form to another, in laboratories and industries, were magnetic and the interpretations relied on magnetic dipolar interactions. The variety concentration of a sample and the conversion rates induced by a catalytic action were mostly measured by thermal methods related to the diffusion of the o-p reaction heat. At the turning of the new century, the nature of the studied catalysts and the type of measures and motivations completely changed. Catalysts investigated now are non-magnetic and new spectroscopic measurements have been developed. After a fast survey of the past studies, the review details the spectroscopic methods, emphasizing their originalities, performances and refinements: how Infra-Red measurements characterize the catalytic sites and follow the conversion in real-time, Ultra-Violet irradiations explore the electronic nature of the reaction and hyper-frequencies driving the nuclear spins. The new catalysts, metallic or insulating, are detailed to display the operating electronic structure. New electromagnetic mechanisms, involving energy and momenta transfers, are discovered providing a classification frame for the newly observed reactions.

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Infrared spectroscopy of water clusters co-adsorbed with hydrogen molecules on a sodium chloride film

Cited by 11 publications

References 33 publications

Infrared spectroscopy of water clusters isolated in methane matrices: Effects of isotope substitution and annealing

Infrared spectroscopy of water clusters isolated in methane matrices: Effects of isotope substitution and annealing

D2O clusters isolated in rare-gas solids: Dependence of infrared spectrum on concentration, deposition rate, heating temperature, and matrix material

Hydrogen Conversion in Nanocages

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