Near edge x-ray-absorption fine-structure determination of alkyl-chain orientation: Breakdown of the ‘‘building-block’’ scheme

Hähner, Georg; Kinzler, M.; Wöll, Ch.; Grunze, M.; Scheller, M. K.; Cederbaum, L. S.

doi:10.1103/physrevlett.67.851

Cited by 120 publications

(105 citation statements)

References 13 publications

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“…Peak ''f'' corresponds to the transition of C 1s of the aliphatic carbons to the C-C * anti-bonding orbitals in both SAMs prepared from alkanethiols 1 or 2. 31 Substitution of electronegative atoms of fluorine and oxygen on aromatic rings induces a partial positive charge on the carbon. which increases the binding energy of the C 1s level.…”

Section: Resultsmentioning

confidence: 99%

Dipole-induced structure in aromatic-terminated self-assembled monolayers—A study by near edge x-ray absorption fine structure spectroscopy

Luk

Abbott

Crain

et al. 2004

The Journal of Chemical Physics

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The structure of self-assembled monolayers presenting aromatic rings at a surface is studied by near edge x-ray absorption fine structure spectroscopy ͑NEXAFS͒. Fluorine substitution at asymmetric positions in the aromatic rings is used to generate a layer of dipoles at the surface of the monolayer. We find that fluorine substituted aromatic rings are more ordered than unsubstituted aromatic rings by a factor of two based on the polarization dependence of the lowest C 1s to * transition, which is associated with transitions from phenyl carbons attached to hydrogens. This result is consistent with the influence of dipole-dipole interactions and quadrupolar interactions between the aromatic groups due to the substitution of fluorine atoms. The work also serves to illustrate how subtle variations in the orientation of an end group of a self-assembled monolayer can be determined by using NEXAFS.

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Section: Resultsmentioning

confidence: 99%

Dipole-induced structure in aromatic-terminated self-assembled monolayers—A study by near edge x-ray absorption fine structure spectroscopy

Luk

Abbott

Crain

et al. 2004

The Journal of Chemical Physics

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“…6(a) for tetracontane melted onto silicon, with one sample having been slowly heated to 220 • C over the course of about an hour prior to the measurement, featuring characteristic peaks due to a C-H * bond near 288 eV and a σ * C-C bond near 292.3 eV, in agreement with previous observations. 72 The spectrum for polyethylene deposited on glass, shown in Fig. 6(b), displays these features as well as a small π * peak near 285.3 eV that is characteristic of a C=C double bond.…”

Section: Near Edge X-ray Absorption Fine Structurementioning

confidence: 99%

Investigation of antirelaxation coatings for alkali-metal vapor cells using surface science techniques

Seltzer¹,

Michalak²,

Donaldson³

et al. 2010

The Journal of Chemical Physics

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Many technologies based on cells containing alkali-metal atomic vapor benefit from the use of anti-relaxation surface coatings in order to preserve atomic spin polarization. In particular, paraffin has been used for this purpose for several decades and has been demonstrated to allow an atom to experience up to 10,000 collisions with the walls of its container without depolarizing, but the details of its operation remain poorly understood. We apply modern surface and bulk techniques to the study of paraffin coatings, in order to characterize the properties that enable the effective preservation of alkali spin polarization. These methods include Fourier transform infrared spectroscopy, differential scanning calorimetry, atomic force microscopy, near-edge X-ray absorption fine structure spectroscopy, and X-ray photoelectron spectroscopy. We also compare the light-induced atomic desorption yields of several different paraffin materials. Experimental results include the determination that crystallinity of the coating material is unnecessary, and the detection of C=C double bonds present within a particular class of effective paraffin coatings. Further study should lead to the development of more robust paraffin anti-relaxation coatings, as well as the design and synthesis of new classes of coating materials.

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“…Unlike for OTA, a distinct angular variation of the resonances is observed, as is evident from the spectra and the difference spectrum. The transitions into C-C * and C-H* orbitals exhibit an opposite polarization dependence, since the corresponding molecular orbitals are perpendicular for alkyl chains in an all-trans conformation (36,37). A more quantitative analysis of the angular variation was performed in order to determine the average tilt angle of the alkyl chains.…”

Section: Table 1 Assignment Of the Nexafs Transitions At The C 1s Edgementioning

confidence: 99%

Self-Assembled Monolayers of Alkylammonium Ions on Mica: Direct Determination of the Orientation of the Alkyl Chains

Brovelli

Caseri

Hähner

1999

Journal of Colloid and Interface Science

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Near edge x-ray-absorption fine-structure determination of alkyl-chain orientation: Breakdown of the ‘‘building-block’’ scheme

Cited by 120 publications

References 13 publications

Dipole-induced structure in aromatic-terminated self-assembled monolayers—A study by near edge x-ray absorption fine structure spectroscopy

Dipole-induced structure in aromatic-terminated self-assembled monolayers—A study by near edge x-ray absorption fine structure spectroscopy

Investigation of antirelaxation coatings for alkali-metal vapor cells using surface science techniques

Self-Assembled Monolayers of Alkylammonium Ions on Mica: Direct Determination of the Orientation of the Alkyl Chains

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