Adsorption of N2 monolayers on Papyex in the liquid and vapor phases

Y. Finkelstein; R. Moreh; D. Nemirovsky; O. Shahal; H. Tobias

doi:10.1016/S0039-6028(99)00990-5

Adsorption of N₂ monolayers on Papyex in the liquid and vapor phases

Y. Finkelstein, R. Moreh, D. Nemirovsky, O. Shahal, H. Tobias

Department of Physics

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

The nuclear resonance photon scattering (NRPS) technique has been used for measuring the out-of-plane tilt angle of physisorbed ¹⁵N₂ relative to a graphite surface (in a Papyex form) between n=0.6 and 2.4 commensurate monolayers (CML), in the range 80-297 K. This was done by measuring the resonantly scattered intensities from the 6324 keV level in ¹⁵N with the photon beam parallel and perpendicular to the Papyex planes. For the first time, detailed measurements were carried out at high temperatures, well above the 2D tricritical point (T_c≈85 K), where the N₂ gas is known to occur in the vapor phase on Papyex. The results show beyond any doubt that even at T= 140 K, the molecules have, on average, a definite forward tilt with respect to the graphite surface and that the tilt angle increases with coverage. The results are compared with molecular dynamic simulations (MDS) and grand canonical Monte Carlo calculations (GCMC).

Original language	English
Pages (from-to)	89-98
Number of pages	10
Journal	Surface Science
Volume	443
Issue number	1-2
DOIs	https://doi.org/10.1016/S0039-6028(99)00990-5
State	Published - 10 Dec 1999

Keywords

Molecular coverage
Molecular orientation
N
Normal modes
Nuclear resonance photon scattering
Papyex
Physical adsorption
Zero-point energy

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10.1016/S0039-6028(99)00990-5

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title = "Adsorption of N2 monolayers on Papyex in the liquid and vapor phases",

abstract = "The nuclear resonance photon scattering (NRPS) technique has been used for measuring the out-of-plane tilt angle of physisorbed 15N2 relative to a graphite surface (in a Papyex form) between n=0.6 and 2.4 commensurate monolayers (CML), in the range 80-297 K. This was done by measuring the resonantly scattered intensities from the 6324 keV level in 15N with the photon beam parallel and perpendicular to the Papyex planes. For the first time, detailed measurements were carried out at high temperatures, well above the 2D tricritical point (Tc≈85 K), where the N2 gas is known to occur in the vapor phase on Papyex. The results show beyond any doubt that even at T= 140 K, the molecules have, on average, a definite forward tilt with respect to the graphite surface and that the tilt angle increases with coverage. The results are compared with molecular dynamic simulations (MDS) and grand canonical Monte Carlo calculations (GCMC).",

keywords = "Molecular coverage, Molecular orientation, N, Normal modes, Nuclear resonance photon scattering, Papyex, Physical adsorption, Zero-point energy",

author = "Y. Finkelstein and R. Moreh and D. Nemirovsky and O. Shahal and H. Tobias",

note = "Funding Information: We would like to express our gratitude to Professor W.A. Steele and to Professor V. Bekaev for many fruitful discussions and for lending us their GCMC code for calculating the tilt angles. Thanks are also due to Mr Y. Feuerlicht, D. Kalir and S. Melloul for their technical assistance during the course of this work. This research was supported by the German–Israeli Foundation for Scientific Research and Development (GIF).",

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AU - Finkelstein, Y.

AU - Moreh, R.

AU - Nemirovsky, D.

AU - Shahal, O.

AU - Tobias, H.

N1 - Funding Information: We would like to express our gratitude to Professor W.A. Steele and to Professor V. Bekaev for many fruitful discussions and for lending us their GCMC code for calculating the tilt angles. Thanks are also due to Mr Y. Feuerlicht, D. Kalir and S. Melloul for their technical assistance during the course of this work. This research was supported by the German–Israeli Foundation for Scientific Research and Development (GIF).

PY - 1999/12/10

Y1 - 1999/12/10

N2 - The nuclear resonance photon scattering (NRPS) technique has been used for measuring the out-of-plane tilt angle of physisorbed 15N2 relative to a graphite surface (in a Papyex form) between n=0.6 and 2.4 commensurate monolayers (CML), in the range 80-297 K. This was done by measuring the resonantly scattered intensities from the 6324 keV level in 15N with the photon beam parallel and perpendicular to the Papyex planes. For the first time, detailed measurements were carried out at high temperatures, well above the 2D tricritical point (Tc≈85 K), where the N2 gas is known to occur in the vapor phase on Papyex. The results show beyond any doubt that even at T= 140 K, the molecules have, on average, a definite forward tilt with respect to the graphite surface and that the tilt angle increases with coverage. The results are compared with molecular dynamic simulations (MDS) and grand canonical Monte Carlo calculations (GCMC).

AB - The nuclear resonance photon scattering (NRPS) technique has been used for measuring the out-of-plane tilt angle of physisorbed 15N2 relative to a graphite surface (in a Papyex form) between n=0.6 and 2.4 commensurate monolayers (CML), in the range 80-297 K. This was done by measuring the resonantly scattered intensities from the 6324 keV level in 15N with the photon beam parallel and perpendicular to the Papyex planes. For the first time, detailed measurements were carried out at high temperatures, well above the 2D tricritical point (Tc≈85 K), where the N2 gas is known to occur in the vapor phase on Papyex. The results show beyond any doubt that even at T= 140 K, the molecules have, on average, a definite forward tilt with respect to the graphite surface and that the tilt angle increases with coverage. The results are compared with molecular dynamic simulations (MDS) and grand canonical Monte Carlo calculations (GCMC).

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KW - Nuclear resonance photon scattering

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KW - Physical adsorption

KW - Zero-point energy

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Adsorption of N₂ monolayers on Papyex in the liquid and vapor phases

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