State-selective energy and angular resolved detection of neutral species ejected from keV ion bombarded C6H6/Ag{1 1 1}

Vandeweert, Erno; Meserole, Chad A.; Sostarecz, Audra G.; Dou, Yusheng; Winograd, Nicholas; Postawa, Zbigniew

doi:10.1016/s0168-583x(99)01105-2

Cited by 13 publications

(10 citation statements)

References 12 publications

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“…In order to reduce the photofragmentation process, resonance enhanced multi‐photon ionization (REMPI) was used. To ionize the phenyl‐containing molecular particles, resonant two‐photon one‐colour photoionization was used at 259 nm with relatively low photon fluence (∼10 18 photons/cm 2 ) 40. The created photoions were subsequently accelerated and detected in a linear time‐of‐flight mass spectrometer with a mass resolution of about 200.…”

Section: Methodsmentioning

confidence: 99%

Ion‐Beam‐Induced Desorption as a Method for Probing the Stability of the Molecule‐Substrate Interface in Self‐Assembled Monolayers

et al. 2011

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[a] During recent years self-assembled monolayers (SAMs) have been recognized as model structures for different areas in nanotechnology, ranging from nanolithography and molecular electronics to sensors and biocompatible materials.[1] A growing range of possible new SAM applications demands better understanding of their detailed molecular structure, which is a result of balancing molecule-molecule and molecule-substrate interactions in the monolayer. Despite the numerous structural studies of SAMs available nowadays, the structure and stability of the SAM-substrate interface is still poorly understood. Even for a most simple SAM system of methanethiol on Au(111), identification of the adsorption geometry (the AuÀS interface) remains controversial. [2,3] As a consequence, the experimental and theoretical analysis of the bonding geometry and the stability of the molecule-substrate interface for technologically relevant, and therefore more complicated SAMs, is extremely difficult. Importantly, this missing information remains fundamental for most of SAMs potential applications with molecular electronics in particular.[4]Herein we propose using ion-induced desorption in combination with neutral fragment mass spectrometry as a method to analyze the chemical stability of the molecule-substrate interface in complicated and technologically relevant SAMs. This work builds on previous studies analyzing the behavior of SAMs on a Au(111) substrate upon bombardment with beams of Ar + ions in the keV range. [5][6][7][8] It was shown that the bombardment of aromatic thiol SAMs on a Au(111) substrate results in the ejection of neutral molecular fragments via two distinct desorption mechanisms. A minor percentage of the SAM fragments leave the surface with high kinetic energy (~eV) as a result of the direct momentum transfer from the collision cascade developed in the substrate upon primary ion impact. The overwhelming majority of desorbing particles leaves the surface with low kinetic energies (~10 À2 eV) as a result of "gentle"cleavage of chemical bonds (with no significant momentum transfer) within the organic layer by chemical reactions initiated by reactive fragments (e.g. radicals) created in the organic film as a result of the primary ion impact. Following these findings, ion-induced desorption experiments were performed for aromatic SAMs that form different structural phases on the Au(111) surface. [9] These experiments unambiguously demonstrated that the ion-induced cleavage of chemical bonds in SAMs is extremely sensitive to details of their geometric and electronic configuration, due to the chemical reaction mechanisms involved. To further investigate this effect, a homologue series of 4,4'-biphenyl-substituted alkanethiols [CH 3 ÀC 6 H 4 ÀC 6 H 4 À(CH 2 ) n ÀSH; BPnS; n = 1-6] deposited on a Au(111) substrate was analyzed.[10] Former microscopic [11] and spectroscopic [12,13] experiments demonstrated that, depending on the parity of the number of CH 2 units (the parameter n is odd or even), two different structure...

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Section: Methodsmentioning

confidence: 99%

Ion‐Beam‐Induced Desorption as a Method for Probing the Stability of the Molecule‐Substrate Interface in Self‐Assembled Monolayers

et al. 2011

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show abstract

“…In order to reduce the photofragmentation process, resonance enhanced multi‐photon ionization (REMPI) was used. To ionize the phenyl‐containing molecular particles, resonant two‐photon one‐colour photoionization was used at 259 nm with relatively low photon fluence (∼10 18 photons cm −2 ) 34. The created photoions were subsequently accelerated and detected in a linear time‐of‐flight mass spectrometer with a mass resolution of about 200.…”

Section: Methodsmentioning

confidence: 99%

The potential impact of biogenic emissions of isoprene on urban chemistry in the United Kingdom

Watson

Wang

Hamer

et al. 2006

Atmospheric Science Letters

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“…To ionize the phenylcontaining molecular particles, resonant two-photon one-colour photoionization was used at 259 nm with relatively low photon fluence (~10 18 photons cm À2 ). [34] The created photoions were subsequently accelerated and detected in a linear time-of-flight mass spectrometer with a mass resolution of about 200. Changing the delay time between the incidence of the primary ion beam pulse on the sample and the firing moment of the laser, kept at a fixed position above the sample surface, enables selection of the kinetic energy of the analyzed species.…”

Section: à2mentioning

confidence: 99%

Odd‐Even Effects in Ion‐Beam‐Induced Desorption of Biphenyl‐Substituted Alkanethiol Self‐Assembled Monolayers

et al. 2010

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State-selective energy and angular resolved detection of neutral species ejected from keV ion bombarded C6H6/Ag{1 1 1}

Cited by 13 publications

References 12 publications

Ion‐Beam‐Induced Desorption as a Method for Probing the Stability of the Molecule‐Substrate Interface in Self‐Assembled Monolayers

Ion‐Beam‐Induced Desorption as a Method for Probing the Stability of the Molecule‐Substrate Interface in Self‐Assembled Monolayers

The potential impact of biogenic emissions of isoprene on urban chemistry in the United Kingdom

Odd‐Even Effects in Ion‐Beam‐Induced Desorption of Biphenyl‐Substituted Alkanethiol Self‐Assembled Monolayers

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