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関連する概念動画

Light as Energy01:35

Light as Energy

The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit less...
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
UV–Vis Spectrum01:30

UV–Vis Spectrum

When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar absorptivity (ε) or log ε on the y-axis (ordinate)...
Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels. Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.

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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
08:12

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing

Published on: March 13, 2013

水性ミセラ溶液における2光子の吸収

Han Young Woo1, Dmitry Korystov, Alexander Mikhailovsky

  • 1Mitsubishi Chemical Center for Advanced Materials, Department of Materials, Institute for Polymers and Organic Solids, University of California, Santa Barbara, California 93106, USA.

Journal of the American Chemical Society
|October 6, 2005
PubMed
まとめ
この要約は機械生成です。

硫酸ドデシルナトリウムのような表面活性物質を添加すると,電荷を持つ [2.2]パラサイクロファンの分子の発光特性が強化されます. この発見は,2フォトン顕微鏡の応用を理解し,より優れた分子プローブを設計するために不可欠です.

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科学分野:

  • フォトケミストリー フォトケミストリー
  • 超分子化学 超分子化学
  • マテリアルサイエンス 材料科学

背景:

  • ドナー-ピ-ドナー (D-pi-D) 構造を持つ充電された [2.2]パラサイクロファンの染色体には,その光学的性質が興味深い.
  • 水性環境での彼らの行動を理解することは,生物学的および材料のアプリケーションにとって不可欠です.
  • 表面活性物質は,分子の局所環境を変化させ,その光物理的性質に影響を与えることができます.

研究 の 目的:

  • 充電された [2.2]パラサイクロファンの染色体の光量子収量と2フォトンの吸収横断面に対するドデシル硫酸ナトリウム (SDS) の影響を調査する.
  • ミセラー溶液の光物理的性質を有機溶媒の光物理的性質と比較する.
  • 水中の2フォトン特性を強化した分子を設計するための洞察を提供すること.

主な方法:

  • 充電された [2.2]パラサイクロファンの染色体とD-pi-D部分の合成.
  • 微細粒子の臨界濃度を超えるSDSを含む水溶液における光譜測定 (光量子収量,二光子吸収横断)
  • トロウエンの中性アナログとスペクトルデータの比較.

主要な成果:

  • SDSの追加により,光量子収量と2光子の吸収交差点を有意に増加させた.
  • ミセラー溶液のスペクトルは,トルーエンの中性同類のスペクトルと非常に似ています.
  • 測定された2フォトンの作用横断面 (エタデルタ) 値は高 (1Cには1300GM,2Cには1920GM) であり,トルーエンの値と同等またはそれ以上であった.

結論:

  • 表面活性ミセルは,充電された染色体の光物理的性質を最適化する環境を作り出すことができます.
  • この研究は,顕微鏡における基板濃度に対する2光子誘発放射の誤った解釈の可能性を強調しています.
  • 発見は,水中のアプリケーションのための改善された2フォトン作用横断面を持つ分子構造を設計するためのガイドラインを提供します.