Dynamics of NF3 in a condensed film on Au(1 1 1) as studied by electron-stimulated desorption

Izabela Irena Rzeznicka, Junseok Lee, John T. Yates

研究成果: Article

5 引用 (Scopus)

抄録

We report a low-temperature dynamics study of condensed layers of NF3 on Au(1 1 1) by time-of-flight electron-stimulated desorption ion angular distribution (TOF-ESDIAD), temperature-programmed desorption (TPD) and low-temperature scanning tunneling microscopy (LT-STM). Upon adsorption at 30 K, molecular NF3 adsorption occurs first at the step edges and at minor terrace defect sites with the formation of 2D islands. Within the islands, NF3 is adsorbed in an upright conformation via the nitrogen lone pair electrons projecting fluorine atoms away from the surface as judged by the presence of only a sharp F+ central beam in the ESDIAD pattern. At higher coverages, 3D islands start to populate the surface. Electron bombardment of a thick NF3 (∼6 ML) layer adsorbed on the Au(1 1 1) surface leads to emission of F+, N+, NF+, NF2 + and NF3 + ions as observed in the TOF-ESD distribution. Upon heating to ∼37 K, a sudden decrease of the NF2 + and NF3 + ion yield, which is not related to thermal desorption, is observed which reflects the surface migration of NF3 molecules, leading to local thinning of the film. The thinning process occurs at the temperature of onset of molecular rotations and self-diffusion in the bulk NF3 crystal. In this process, some NF3 molecules move closer to the surface which results in higher efficiency for ion neutralization by the underlying metal surface. In the TPD spectra, the monolayer desorption is observed to begin at ∼65 K, exhibiting zero-order kinetics with an activation energy of 21 kJ/mol.

元の言語English
ページ(範囲)4492-4500
ページ数9
ジャーナルSurface Science
600
発行部数19
DOI
出版物ステータスPublished - 2006 10 1
外部発表Yes

Fingerprint

Desorption
desorption
Electrons
Ions
electrons
Temperature programmed desorption
ions
molecular rotation
adsorption
electron bombardment
Adsorption
Thermal desorption
Molecules
Fluorine
Angular distribution
metal surfaces
Scanning tunneling microscopy
temperature
fluorine
scanning tunneling microscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

これを引用

Dynamics of NF3 in a condensed film on Au(1 1 1) as studied by electron-stimulated desorption. / Rzeznicka, Izabela Irena; Lee, Junseok; Yates, John T.

:: Surface Science, 巻 600, 番号 19, 01.10.2006, p. 4492-4500.

研究成果: Article

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abstract = "We report a low-temperature dynamics study of condensed layers of NF3 on Au(1 1 1) by time-of-flight electron-stimulated desorption ion angular distribution (TOF-ESDIAD), temperature-programmed desorption (TPD) and low-temperature scanning tunneling microscopy (LT-STM). Upon adsorption at 30 K, molecular NF3 adsorption occurs first at the step edges and at minor terrace defect sites with the formation of 2D islands. Within the islands, NF3 is adsorbed in an upright conformation via the nitrogen lone pair electrons projecting fluorine atoms away from the surface as judged by the presence of only a sharp F+ central beam in the ESDIAD pattern. At higher coverages, 3D islands start to populate the surface. Electron bombardment of a thick NF3 (∼6 ML) layer adsorbed on the Au(1 1 1) surface leads to emission of F+, N+, NF+, NF2 + and NF3 + ions as observed in the TOF-ESD distribution. Upon heating to ∼37 K, a sudden decrease of the NF2 + and NF3 + ion yield, which is not related to thermal desorption, is observed which reflects the surface migration of NF3 molecules, leading to local thinning of the film. The thinning process occurs at the temperature of onset of molecular rotations and self-diffusion in the bulk NF3 crystal. In this process, some NF3 molecules move closer to the surface which results in higher efficiency for ion neutralization by the underlying metal surface. In the TPD spectra, the monolayer desorption is observed to begin at ∼65 K, exhibiting zero-order kinetics with an activation energy of 21 kJ/mol.",
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T1 - Dynamics of NF3 in a condensed film on Au(1 1 1) as studied by electron-stimulated desorption

AU - Rzeznicka, Izabela Irena

AU - Lee, Junseok

AU - Yates, John T.

PY - 2006/10/1

Y1 - 2006/10/1

N2 - We report a low-temperature dynamics study of condensed layers of NF3 on Au(1 1 1) by time-of-flight electron-stimulated desorption ion angular distribution (TOF-ESDIAD), temperature-programmed desorption (TPD) and low-temperature scanning tunneling microscopy (LT-STM). Upon adsorption at 30 K, molecular NF3 adsorption occurs first at the step edges and at minor terrace defect sites with the formation of 2D islands. Within the islands, NF3 is adsorbed in an upright conformation via the nitrogen lone pair electrons projecting fluorine atoms away from the surface as judged by the presence of only a sharp F+ central beam in the ESDIAD pattern. At higher coverages, 3D islands start to populate the surface. Electron bombardment of a thick NF3 (∼6 ML) layer adsorbed on the Au(1 1 1) surface leads to emission of F+, N+, NF+, NF2 + and NF3 + ions as observed in the TOF-ESD distribution. Upon heating to ∼37 K, a sudden decrease of the NF2 + and NF3 + ion yield, which is not related to thermal desorption, is observed which reflects the surface migration of NF3 molecules, leading to local thinning of the film. The thinning process occurs at the temperature of onset of molecular rotations and self-diffusion in the bulk NF3 crystal. In this process, some NF3 molecules move closer to the surface which results in higher efficiency for ion neutralization by the underlying metal surface. In the TPD spectra, the monolayer desorption is observed to begin at ∼65 K, exhibiting zero-order kinetics with an activation energy of 21 kJ/mol.

AB - We report a low-temperature dynamics study of condensed layers of NF3 on Au(1 1 1) by time-of-flight electron-stimulated desorption ion angular distribution (TOF-ESDIAD), temperature-programmed desorption (TPD) and low-temperature scanning tunneling microscopy (LT-STM). Upon adsorption at 30 K, molecular NF3 adsorption occurs first at the step edges and at minor terrace defect sites with the formation of 2D islands. Within the islands, NF3 is adsorbed in an upright conformation via the nitrogen lone pair electrons projecting fluorine atoms away from the surface as judged by the presence of only a sharp F+ central beam in the ESDIAD pattern. At higher coverages, 3D islands start to populate the surface. Electron bombardment of a thick NF3 (∼6 ML) layer adsorbed on the Au(1 1 1) surface leads to emission of F+, N+, NF+, NF2 + and NF3 + ions as observed in the TOF-ESD distribution. Upon heating to ∼37 K, a sudden decrease of the NF2 + and NF3 + ion yield, which is not related to thermal desorption, is observed which reflects the surface migration of NF3 molecules, leading to local thinning of the film. The thinning process occurs at the temperature of onset of molecular rotations and self-diffusion in the bulk NF3 crystal. In this process, some NF3 molecules move closer to the surface which results in higher efficiency for ion neutralization by the underlying metal surface. In the TPD spectra, the monolayer desorption is observed to begin at ∼65 K, exhibiting zero-order kinetics with an activation energy of 21 kJ/mol.

KW - Au(1 1 1)

KW - Condensed molecular films

KW - Low-temperature scanning tunneling microscope

KW - Molecular rotation

KW - Nitrogen trifluoride

KW - Temperature-programmed desorption

KW - Time-of-flight electron-stimulated desorption ion angular distribution

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U2 - 10.1016/j.susc.2006.07.014

DO - 10.1016/j.susc.2006.07.014

M3 - Article

AN - SCOPUS:33749251820

VL - 600

SP - 4492

EP - 4500

JO - Surface Science

JF - Surface Science

SN - 0039-6028

IS - 19

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