Molecules at Surfaces and Interfaces Studied Using Vibrational Spectroscopies and Related Techniques

Dumas, Paul; Weldon, M. K.; Chabal, Yves J.; Williams, Gwyn

doi:10.1142/s0218625x99000263

Cited by 51 publications

(21 citation statements)

References 139 publications

(148 reference statements)

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“…Direct experimental measurement using ultrafast 2D vibrational echoes also showed that the spectral diffusion is indeed much slower and much more insignificant in the molecular monolayer in comparison to that in the bulk liquid [133,134]. Therefore, in the treatment of the surface vibrational spectral lineshape, the Bloch dynamics is usually a reasonable approximation of the surface vibrational dynamics, particularly for well packed molecular monolayers [61,100,101,139]. Thus, the vibrational spectral lineshape based on Bloch dynamics model will be explicitly discussed along with the development of the HR-BB-SFG-VS in this review.…”

Section: Sfg-vs As a Two-dimensional Nonlinear Spectroscopymentioning

confidence: 99%

Sum frequency generation vibrational spectroscopy (SFG-VS) for complex molecular surfaces and interfaces: Spectral lineshape measurement and analysis plus some controversial issues

Wang

2016

Progress in Surface Science

113

127

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Sum-frequency generation vibrational spectroscopy (SFG-VS) was first developed in the 1980s and it has been proven a uniquely sensitive and surface/interface selective spectroscopic probe for characterization of the structure, conformation and dynamics of molecular surfaces and interfaces. In recent years, there have been many progresses in the development of methodology and instrumentation in the SFG-VS toolbox that has significantly broadened the application to complex molecular surfaces and interfaces. In this review, after presenting a unified view on the theory and methodology focusing on the SFG-VS spectral lineshape, as well as the new opportunities in SFG-VS applications with such developments, some of the controversial issues that have been puzzling the community are discussed. The aim of this review is to present to the researchers and students interested in molecular surfaces and interfacial sciences up-to-date perspectives complementary to the existing textbooks and reviews on SFG-VS.

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Section: Sfg-vs As a Two-dimensional Nonlinear Spectroscopymentioning

confidence: 99%

Sum frequency generation vibrational spectroscopy (SFG-VS) for complex molecular surfaces and interfaces: Spectral lineshape measurement and analysis plus some controversial issues

Wang

2016

Progress in Surface Science

113

127

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“…Despite this importance, quantitative, direct measurements of the two coupled components, the adsorbate vibrational mode and the underlying electronic continuum, with adequate resolution and sensitivity are rare [1,2]. While the phonon side of the problem is now well studied [3], there has been to date little or no work to directly see the effect of adsorbate phonons on electronic states.…”

mentioning

confidence: 99%

Coupling Between Adsorbate Vibrations and an Electronic Surface State

2000

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We report direct angle-resolved photoemission measurements of the coupling between the symmetric stretch vibrational mode of adsorbed hydrogen and a surface band on W(110). This coupling is manifested by the surface band being split into two branches at a binding energy comparable to the vibrational mode energy, as confirmed by observation of a dramatic hydrogen/deuterium isotope effect. The electron-phonon coupling parameter lambda is found to be significantly larger than that for bulk W, and to be closely related to the degree of surface localization of the surface state wave function.

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“…It indicates that OH Ϫ ions in the solution can remove the defects of the rough surface 19 and some ͑111͒ facets might be developed on it. 17,18 This assumption can be supported by the previous IR results 10,17,18 that a strong band ͑even stronger͒ 18 in the region of 2000-2200 cm Ϫ1 can still be found by using IR on the Si͑100͒ surface after the treatment by a pH-elevated solution. The changing trend in band intensity is different due to the roughened silicon surface in our case can become smoother, while an atomically rough surface can remain in IR investigation.…”

Section: Resultsmentioning

confidence: 58%

Initial Oxidation Processes on Hydrogenated Silicon Surfaces Studied by In Situ Raman Spectroscopy

Liu¹,

Ren²,

Yan³

et al. 2002

J. Electrochem. Soc.

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The influence of the solution pH on H-terminated silicon surfaces in different electrolytes was investigated by in situ confocal Raman microscopy. This study provides Raman evidence that the initial oxidation of the hydrogenated silicon surface could occur by two paths. In the lower pH solution, the H-terminated silicon surface could be directly oxidized by the attack of OH Ϫ ; in the higher pH solution, the surface oxidation occurs in the second layer by the insertion of OH Ϫ into the back bond of Si-H ͑Si-Si͒, in which an intermediate species of uO 3 SiH could be found. In the study of the influence of electrolytes, it was found that F Ϫ ion could assist and accelerate the oxidation reaction, while the attack of OH Ϫ ion is essential to the initial oxidation processes. By taking advantage of Raman spectroscopy in the study of the low frequency region and analyzing the results from various samples, the assignment of the band located at about 629 cm Ϫ1 is discussed in detail and attributed to the vibrations of the silicon hydride and multiphonon structure.Wet chemical etching and oxidation of silicon are crucial to the semiconductor industry in the manufacturing of integrated circuits. An in situ investigation of the wet chemical etching and oxidation processes is highly desirable. Vibrational spectroscopies are important tools in characterizing the local bonding environments in semiconductors. There are a wealth of reports on the hydrogen bonding on the flat silicon surfaces of various crystal faces and on polycrystalline by using IR spectroscopy. 1-4 This technique is highly sensitive, and has provided detailed information of the surface configurations, such as silicon oxides and silicon hydrides. Furthermore, IR can identify covalently bonded hydrogen to be distributed among four different environments in the hydrogenated silicon: monohydride ͑ϵSi-H͒, dihydride (ϭSiH 2 ), trihydride (-SiH 3 ), and polymeric hydride (SiH 2 ) n . 1-4 However, there is presently no consensus about the details of the mechanism involved for etching or oxidation processes, and consequently, controversy has developed over the veracity of several proposed models. 4-7 Moreover, it is difficult for IR spectroscopy to provide the low frequency vibrational ͑Ͻ650 cm Ϫ1 ͒ information. Thus, to unravel the detailed mechanism for the above processes, a complementary technique, such as Raman spectroscopy, is highly desirable.Raman spectroscopy has some unique advantages over other spectroscopic techniques on the study of the silicon surface. First it can provide simultaneously the signal from the surface species and the silicon substrate. Second, it can detect vibrational bands in the low frequency region easily, which may be helpful to elucidate the mechanism of the etching and oxidation processes. Third, Raman spectroscopy can be conveniently used to monitor the reaction processes in situ in the aqueous solution because the Raman signal of water is very weak. Therefore, even a thick solution layer over the silicon surface will not severely i...

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Molecules at Surfaces and Interfaces Studied Using Vibrational Spectroscopies and Related Techniques

Cited by 51 publications

References 139 publications

Sum frequency generation vibrational spectroscopy (SFG-VS) for complex molecular surfaces and interfaces: Spectral lineshape measurement and analysis plus some controversial issues

Sum frequency generation vibrational spectroscopy (SFG-VS) for complex molecular surfaces and interfaces: Spectral lineshape measurement and analysis plus some controversial issues

Coupling Between Adsorbate Vibrations and an Electronic Surface State

Initial Oxidation Processes on Hydrogenated Silicon Surfaces Studied by In Situ Raman Spectroscopy

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