Reaction-Path Selection with Molecular Orientation of CH<sub>3</sub>Cl on Si{100}

Okada, Michio; Goto, Seishiro; Kasai, Toshio

doi:10.1021/ja070931b

Cited by 22 publications

(32 citation statements)

References 28 publications

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“…Although there are a lot of studies on the steric effects of diatomic molecules on surfaces, [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][26][27][28][29][30][31][35][36][37]41 the works on polyatomic molecules are rare. 1,[17][18][19][20][21][22][23][24][25][31][32][33][38][39][40] The steric effects of a polyatomic system was first reported by Novakoshi and McClelland in the CF 3 H scattering from Ag(111) surface. 1 They determined the molecular orientation of the outgoing molecule after collisions.…”

Section: Introductionmentioning

confidence: 94%

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Steric Effects in the Scattering of Oriented CH₃Cl Molecular Beam from a Graphite Surface: Weak Interaction of Physisorption

2009

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We report results of a study on steric effects appearing in the scattering of an oriented CH(3)Cl molecular beam from highly oriented pyrolytic graphite (HOPG) surface at 300 K. Data presented here show that the scattered CH(3)Cl beam intensity measured at a fixed scattering angle clearly depends on the initial molecular orientation toward the HOPG surface. The scattered CH(3)Cl beam intensity for the CH(3)-end collision is larger than that for the Cl-end collision, suggesting that strong anisotropy of the interaction potential induces the molecular-orientation-dependent energy dissipation during transient trapping into the physisorption well.

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Section: Introductionmentioning

confidence: 94%

“…[38][39][40] Therefore, to clarify the importance of the dynamical process in such transient trapping into a precursor state, the weakly bound CH 3 Cl/HOPG is one of the best candidates.…”

Section: Introductionmentioning

confidence: 99%

Steric Effects in the Scattering of Oriented CH₃Cl Molecular Beam from a Graphite Surface: Weak Interaction of Physisorption

2009

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“…selection may be possible in such a process, depending on the molecular orientation. [92] It is quite interesting that when the |212〉 state at Ei = 120 meV was dosed on the surface, no large orientation effects were observed, as shown in Figure 11. According to theoretical calculations, [96,97] one of the possible precursors is almost parallel to the surface, with CH3 between the two dimer rows and Cl close to the lower Si of a dimer, as shown in Figure 12.…”

Section: Steric Effects In Ch3cl/si(100)mentioning

confidence: 94%

Supersonic Molecular Beam Experiments on Surface Chemical Reactions

Okada

2014

The Chemical Record

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The interaction of a molecule and a surface is important in various fields, and in particular in complex systems like biomaterials and their related chemistry. However, the detailed understanding of the elementary steps in the surface chemistry, for example, stereodynamics, is still insufficient even for simple model systems. In this Personal Account, I review our recent studies of chemical reactions on single-crystalline Cu and Si surfaces induced by hyperthermal oxygen molecular beams and by oriented molecular beams, respectively. Studies of oxide formation on Cu induced by hyperthermal molecular beams demonstrate a significant role of the translational energy of the incident molecules. The use of hyperthermal molecular beams enables us to open up new chemical reaction paths specific for the hyperthermal energy region, and to develop new methods for the fabrication of thin films. On the other hand, oriented molecular beams also demonstrate the possibility of understanding surface chemical reactions in detail by varying the orientation of the incident molecules. The steric effects found on Si surfaces hint at new ways of material fabrication on Si surfaces. Controlling the initial conditions of incoming molecules is a powerful tool for finely monitoring the elementary step of the surface chemical reactions and creating new materials on surfaces.

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“…[35][36][37] The quantitative degree of orientation has been studied in detail. 38,39) In previous work, [1][2][3][4] we reviewed the principles of focusing and orientation of CH 3 Cl by an electrostatic hexapole and a uniform field in front of the crystal surface. Kleyn and coworkers also reviewed the focusing and orientation of NO.…”

Section: Methodsmentioning

confidence: 99%

“…[1][2][3][4] In the previous work on the measurements of sticking probability using the King-Wells (KW) methods, [1][2][3][4] we demonstrated the possibility of selection of reaction paths by controlling molecular orientation. In the KW methods monitoring gas-phase products, the chemicalreaction products on the surface induced by an oriented molecular beam are not identified at all.…”

Section: Introductionmentioning

confidence: 99%

New Oriented-Molecular-Beam Machine for Surface Stereochemistry with X-ray Photoemission Spectroscopy

Okada

Hashinokuchi

Moritani

et al. 2008

jjap

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The stereochemical control of surface reactions is one of the ultimate goals of surface scientists. An oriented-molecular-beam technique based on the Stark effect of a molecule in an inhomogeneous hexapole electrostatic field is a potential tool for achieving this goal. This technique allows us to select a specific rotational quantum state and also an orientation of a reagent molecule. We have designed, built, and tuned a new UHV-compatible oriented-molecular-beam machine for the elucidation of surface chemical reactions and their related surface modifications. This apparatus is equipped with the components for Xray photoemission spectroscopy (XPS) in order to detect the surface-reaction products. In the dissociative adsorption of NO on a Si{111} surface, we found a steric effect in the reactivity by monitoring the products on the surface with the new machine. The N-end collision is more reactive than the O-end collision at an incident energy of 58 meV. To our knowledge, this is the first measurement of the steric effect appearing in the reaction products on a surface.

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Reaction-Path Selection with Molecular Orientation of CH₃Cl on Si{100}

Cited by 22 publications

References 28 publications

Steric Effects in the Scattering of Oriented CH₃Cl Molecular Beam from a Graphite Surface: Weak Interaction of Physisorption

Steric Effects in the Scattering of Oriented CH₃Cl Molecular Beam from a Graphite Surface: Weak Interaction of Physisorption

Supersonic Molecular Beam Experiments on Surface Chemical Reactions

New Oriented-Molecular-Beam Machine for Surface Stereochemistry with X-ray Photoemission Spectroscopy

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Reaction-Path Selection with Molecular Orientation of CH3Cl on Si{100}

Cited by 22 publications

References 28 publications

Steric Effects in the Scattering of Oriented CH3Cl Molecular Beam from a Graphite Surface: Weak Interaction of Physisorption

Steric Effects in the Scattering of Oriented CH3Cl Molecular Beam from a Graphite Surface: Weak Interaction of Physisorption

Supersonic Molecular Beam Experiments on Surface Chemical Reactions

New Oriented-Molecular-Beam Machine for Surface Stereochemistry with X-ray Photoemission Spectroscopy

Contact Info

Product

Resources

About

Reaction-Path Selection with Molecular Orientation of CH₃Cl on Si{100}

Steric Effects in the Scattering of Oriented CH₃Cl Molecular Beam from a Graphite Surface: Weak Interaction of Physisorption

Steric Effects in the Scattering of Oriented CH₃Cl Molecular Beam from a Graphite Surface: Weak Interaction of Physisorption