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|a eng
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|a Yeganeh, Mohsen S
|e verfasserin
|4 aut
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|a Sum frequency generation studies of surfaces of high-surface-area powdered materials
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|c 2006
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|a Text
|b txt
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|a ohne Hilfsmittel zu benutzen
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|2 rdamedia
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|a Date Completed 25.06.2007
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|a Date Revised 10.01.2006
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a We report the first observation of sum frequency generation (SFG) photons on high-surface-area powders, critically important materials in heterogeneous catalysis. We utilize SFG in total internal reflection (TIR) geometry and show that the TIR-SFG approach markedly reduces the destructive interference associated with nonlinear optical spectroscopy of small particle surfaces, making SFG studies of high-surface-area powders possible. The index of refraction of materials and their distance from the TIR-SFG prism are key parameters in generating and detecting the sum frequency signal. We find that TIR-SFG is highly sensitive to capillary condensation. To demonstrate the capability of the TIR-SFG technique, we measure the thermodynamics of methanol adsorption and desorption on high-surface-area SiO2
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|a Journal Article
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|a Dougal, Shawn M
|e verfasserin
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|a Silbernagel, Bernard G
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1991
|g 22(2006), 2 vom: 17. Jan., Seite 637-41
|w (DE-627)NLM098181009
|x 0743-7463
|7 nnns
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| 773 |
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|g volume:22
|g year:2006
|g number:2
|g day:17
|g month:01
|g pages:637-41
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