Near edge x‐ray absorption fine structure investigation of the orientation and 
thermally induced order–disorder transition in thin organic films containing 
long chain hydrocarbons

Schertel, A.; Hähner, G.; Grunze, M.; Wöll, Ch.

doi:10.1116/1.580339

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

Near edge x‐ray absorption fine structure investigation of the orientation and thermally induced order–disorder transition in thin organic films containing long chain hydrocarbons

MPS-Authors

/persons/resource/persons211638

Grunze, M.
Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

External Resource

http://avs.scitation.org/doi/pdf/10.1116/1.580339
(Any fulltext)

https://doi.org/10.1116/1.580339
(Any fulltext)

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Schertel, A., Hähner, G., Grunze, M., & Wöll, C. (1996). Near edge x‐ray absorption fine structure investigation of the orientation and thermally induced order–disorder transition in thin organic films containing long chain hydrocarbons. Journal of Vacuum Science and Technology A: Vacuum, Surfaces, and Films, 14(3), 1801-1806. doi:10.1116/1.580339.

Cite as: https://hdl.handle.net/21.11116/0000-0001-AF00-A

Abstract

The thermally induced structural changes in Langmuir–Blodgett films of Ca‐arachidate with one and nine layer thicknesses and those in self‐assembled monolayers of alkanethiols were investigated systematically between 300 and 410 K using near edge x‐ray absorption fine structure (NEXAFS) spectroscopy. With increasing temperature the initial strong linear NEXAFS dichroism reflecting the high degree of orientational order within the films decreases continuously and vanishes above 390 K. In addition, the spectra recorded for elevated temperatures (above 400 K) show a peak splitting of the prominent R* resonance at 287.7 eV which is attributed to changes in the electronic structure of the alkane chains caused by thermally induced structural defects, i.e., gauche conformations. The intensity of this new feature increases exponentially with temperature and allows one to extract an energy of 46 kJ/mol (480 meV) for the creation of a gauche conformation in densely packed hydrocarbon films.