Observation of C-H stretch vibrations of monolayers of molecules optical sum-frequency generation

Hunt, James B.; Guyot‐Sionnest, Philippe; Shen, Y. R.

doi:10.1016/0009-2614(87)87049-5

Cited by 389 publications

(259 citation statements)

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“…Most of the existing spectroscopic techniques, unfortunately, have serious limitations. Recently, we have developed a new versatile surface spectroscopic tool, infrared-visible sumfrequency generation (SFG) [2][3][4][5], that has a number of clear advantages over the existing techniques. Like optical second harmonic generation [6], SFG is highly surface-specific, and is applicable to all interfaces accessible by light.…”

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confidence: 99%

“…With the help of ultrashort pump pulses, it has the potential of monitoring in-situ surface dynamics, surface reactions, and intermediate transient species with picosecond time resolution. In several recent publications, we have successfully demonstrated the possibility of using SFG to obtain vibrational spectra of monolayers of molecules adsorbed at air/liquid [4], air/glass [2,3], and liquid/glass [5] interfaces. However, to many researchers, studies of molecules adsorbed on metals and semiconductors are far more interesting because of their relevance to surface catalysis and surface preparation of electronic devices.…”

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confidence: 99%

“…In the case of surface vibrational studies of molecules on metals and X where a refers to the various near-resonant modes, each specified by ( 3) A 0 , w 0 , and r 0 • The nonresonant part of x( 2 ) can generally be written…”

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confidence: 99%

“…Our experimental setup of IR-visible sum-frequency spectroscopy has been described elsewhere [3]. The visible pump pulses were fixed at 0.532 ~m while the IR pump pulses were tunable around 3.…”

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Surface vibrational spectroscopy of molecular adsorbates on metals and semiconductors by infrared-visible sum-frequency generation

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“…The data were baseline-subtracted and normalized for acquisition time and incoming pulse energy. The spectra were fit according to the well-known formulas for the SFG intensity (see e.g., [22,29]):…”

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Generation and application of high power femtosecond pulses in the vibrational fingerprint region

Sugiharto¹,

Johnson²,

Aguiar³

et al. 2008

Appl. Phys. B

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We present a novel high power femtosecond infrared laser source, based on a three-stage chirped-pulse amplification scheme. Owing to the high power output of the Ti:sapphire amplifiers, it becomes routinely possible to produce femtosecond infrared laser pulses in the wavelength region of 2.6-20 µm with minimum pulse energies of 15 µJ, to our knowledge roughly an improvement of an order of magnitude. With such pulses we have performed femtosecond second-order nonlinear optical surface spectroscopy in the fingerprint region. We have probed the skeletal modes of the first few monolayers of a polymer/air interface in a femtosecond vibrational sum frequency generation experiment. This development opens up new possibilities to investigate surface structures and dynamics of, e.g., organo-metallic compounds, proteins, and peptides.PACS 82.35.Ps

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Assembly of long chain phosphatidylcholines at a liquid-liquid interface

Smiley

Richmond

2000

Biopolymers

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The molecular‐level organization of mixed and pure saturated symmetric chain 1,2‐diacyl‐sn‐glycero‐3‐phosphocholines (PCs) adsorbed at a carbon tetrachloride–aqueous interface is explored by probing the hydrocarbon chain conformation within the adsorbed layer. PCs of the chain lengths found most frequently in biological systems, which in pure form are seen to form either very well‐ordered or disordered layers, are observed in these studies to assemble into interfacial layers ranging from disordered to ordered states when mixed in various proportions. Independently, while C16 and shorter chain PCs tend to form disordered layers, a strong increase in ordering is observed for C18 and longer chain PCs in which the hydrocarbon chains are found to be primarily in an all trans conformation. Pure C17‐PCs adsorbed at the interface produce layers with an intermediate degree of chain ordering. The ability to tune interfacial layer properties in mixed systems as a function of molecular composition, including PC chain length as demonstrated here, is an important mechanism by which surface characteristics of oil–water emulsion systems can be controlled both in vivo and in numerous commercial applications. © 2000 John Wiley & Sons, Inc. Biopolymers (Biospectroscopy) 57: 117–125, 2000

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Observation of C-H stretch vibrations of monolayers of molecules optical sum-frequency generation

Cited by 389 publications

References 2 publications

Surface vibrational spectroscopy of molecular adsorbates on metals and semiconductors by infrared-visible sum-frequency generation

Surface vibrational spectroscopy of molecular adsorbates on metals and semiconductors by infrared-visible sum-frequency generation

Generation and application of high power femtosecond pulses in the vibrational fingerprint region

Assembly of long chain phosphatidylcholines at a liquid-liquid interface

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