Modifikation der spektralen Eigenschaften eines einzelnen Moleküls vor einer Oberfläche

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2001
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Schmitt, Carmen
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Modification of the spectral properties of a single molecule in front of a surface
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Abstract
This work treats experiments with single molecules in two different configurations: First, the molecules are embedded in a microcrystal which is glued to the tip of an optical fibre and approaches a gold surface. In these experiments a distance-dependent lineshift as well as a broadening of the spectral lines of single molecules are observed. Both effects are attributed to mechanical influences on the molecules. In the second configuration, the dye molecules are embedded in nanocrystals which are situated on a cover glass. The latter can be moved in front of an electrically contacted probe using a scanner. Owing to the Stark effect, in this case a strongly position-dependent lineshift of a single molecule can be induced by applying a voltage to the probe. This shift is used to image the probe
Summary in another language
Die Arbeit stellt Experimente mit einzelnen Molekülen in zwei verschiedenen Konfigurationen vor: Einmal sind die Moleküle in einen Mikrokristall eingebettet, der an die Spitze einer Glasfaser geklebt und an eine Goldoberfläche angenähert wird. Dabei werden eine abstandsabhängige Linienverschiebung sowie eine Verbreiterung der Spektrallinien einzelner Moleküle beobachtet. Beide Effekte werden auf mechanische Einflüsse zurückgeführt. In der zweiten Anordnung sind die Farbstoffmoleküle in Nanokristalle eingebettet, die sich auf einem Deckglas befinden. Dieses kann mit Hilfe eines Scanners in drei Dimensionen vor einer elektrisch kontaktierten Sonde bewegt werden. In diesem Fall kann aufgrund des Stark-Effekts durch Anlegen einer Spannung an die Sonde eine stark positionsabhängige Linienverschiebung eines einzelnen Moleküls erreicht werden. Diese Verschiebung wird zur Abbildung der Sonde benutzt.
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530 Physics
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Single molecule spectroscopy
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ISO 690SCHMITT, Carmen, 2001. Modifikation der spektralen Eigenschaften eines einzelnen Moleküls vor einer Oberfläche [Master thesis]
BibTex
@mastersthesis{Schmitt2001Modif-4846,
  year={2001},
  title={Modifikation der spektralen Eigenschaften eines einzelnen Moleküls vor einer Oberfläche},
  author={Schmitt, Carmen}
}
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