Synchrotron x-ray study of the structures and phase transitions of monolayer xenon on single-crystal graphite

Hong, Hawoong; Peters, Charles C.; Mak, A. A.; Birgeneau, R. J.; Horn, Paul; Suematsu, Hiroyoshi

doi:10.1103/physrevb.40.4797

Cited by 51 publications

(38 citation statements)

References 41 publications

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“…At low temperatures the 1 st monolayer of an inert gas is known to grow by condensation of twodimensional (2D) solid islands from a coexisting 2D gas [13]. The origin of zero order kinetics for desorption from graphite surfaces has been studied in detail and is attributed to the thermal equilibrium of Xenon atoms desorbing from the 2D gas on free patches of the surface with Xe atoms desorbing from the second layer on top of the Xe islands [14,15].…”

Section: Resultsmentioning

confidence: 99%

“…The uncertainty of the binding energy within the CDD model is estimated by computing its dependence on different parameters entering the calculation. The dependence of the binding energy ∆E B /E B on the pre-exponential factor νis ∆E B /E B ≈ ∆ν 6·10 -15 s. Using the same pre-exponential factor as for desorption of Xe from HOPG of 3·10 13 s -1 and allowing for an error in the exponent of ±0.5 we obtain an uncertainty of the binding energy of at most 3%. Further contributions may arise from the uncertainty of the mean free path within the samples λ, which should be between 20 nm and 200 nm (6% uncertainty).…”

Section: (11) It Can Be Shown That This Is the Case If (λν/A S D 0 )mentioning

confidence: 94%

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Desorption kinetics and interaction of Xe with single-wall carbon nanotube bundles

Ulbricht

Kriebel

Moos

et al. 2002

Chemical Physics Letters

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We present a study on the kinetics of xenon desorption from single-wall carbon nanotube (SWNT) bundles using thermal desorption spectroscopy (TDS). TD-spectra from SWNT samples show a broad desorption feature peaked at significantly higher temperature than the corresponding low-coverage desorption feature on graphite. The observations are explained using a coupled desorption-diffusion (CDD) model, which allows the determination of the low-coverage Xe binding energy for adsorption on SWNT bundles, 27 kJ/mol. This energy is about 25% higher than the monolayer binding energy on graphite, 21.9 kJ/mol. By comparison with molecular mechanics calculations we find that this increase of the binding energy is consistent with adsorption in highly coordinated groove-sites on the external bundle surface.* Corresponding

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Section: Resultsmentioning

confidence: 99%

Section: (11) It Can Be Shown That This Is the Case If (λν/A S D 0 )mentioning

confidence: 94%

Desorption kinetics and interaction of Xe with single-wall carbon nanotube bundles

Ulbricht

Kriebel

Moos

et al. 2002

Chemical Physics Letters

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“…The monolayer condenses as an incommensurate solid at least down to [42][43][44] T 15 K, as reviewed in Paper I. Ellis et al [42] give L u = 4.42Å at 15 K, a smallest misfit m = 3.7%. The lattice constant data of D'Amico et al [9], Mowforth et al [43], and Venables et al [45,46] at or near the 2D sublimation curve are shown in Fig.…”

Section: A Summary Of Experimental Datamentioning

confidence: 97%

Thermal excitation in a spatially modulated monolayer solid: Incommensurate xenon/graphite

Novaco

Bruch

2014

Phys. Rev. B

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Calculations of the properties of monolayer xenon/graphite for temperatures up to its triple point at 100 K are reported. The average lattice constant and orientational epitaxy angle for the monolayer solid are evaluated along its (two-dimensional) sublimation curve. The incommensurate rotated lattice approaches the incommensurate aligned configuration as the melting temperature is approached, as in experiments. The calculated temperature, latent heat of melting, and solid-liquid density difference at the triple point agree with experiment. The methods include molecular dynamics simulations for large submonolayer patches of xenon and both self-consistentphonon and perturbation-variation approximations. An overall quantitative agreement between the simulations, calculations, and experimental data is achieved with an interaction model that includes the spatially periodic xenon-graphite corrugation energy.

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“…The phase transitions in this system have been the subject of intense study for the past ten years and a detailed picture of the complex phase diagram has emerged [167]. Only two NMR studies of xenon/graphite have appeared in the literature [150,168].…”

Section: Graphitementioning

confidence: 99%

Applications of highly spin-polarized xenon in NMR

Long

1993

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Synchrotron x-ray study of the structures and phase transitions of monolayer xenon on single-crystal graphite

Cited by 51 publications

References 41 publications

Desorption kinetics and interaction of Xe with single-wall carbon nanotube bundles

Desorption kinetics and interaction of Xe with single-wall carbon nanotube bundles

Thermal excitation in a spatially modulated monolayer solid: Incommensurate xenon/graphite

Applications of highly spin-polarized xenon in NMR

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