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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...
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)...
UV–Vis Spectroscopy: Beer–Lambert Law01:09

UV–Vis Spectroscopy: Beer–Lambert Law

The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The modern...
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in the...

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Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation
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Published on: October 30, 2012

マリナー9号の紫外線スペクトロメーター実験:最初の結果

C A Barth, C W Hord, A I Stewart

    Science (New York, N.Y.)
    |January 21, 1972
    PubMed
    まとめ
    この要約は機械生成です。

    火星の紫外線で輝く空気は,太陽活動に関連した一酸化炭素帯の変動を示しています. 原子酸素と水素の排出は一貫して観察され,火星の塵は大気反射に大きく影響する.

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    UV-Vis Spectroscopic Characterization of Nanomaterials in Aqueous Media
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    UV-Vis Spectroscopic Characterization of Nanomaterials in Aqueous Media

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    Assays to Detect UV-reflecting Structures and Determine their Importance in Mate Preference using the Sailfin Molly Poecilia latipinna

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    Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation
    09:53

    Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation

    Published on: October 30, 2012

    UV-Vis Spectroscopic Characterization of Nanomaterials in Aqueous Media
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    UV-Vis Spectroscopic Characterization of Nanomaterials in Aqueous Media

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    科学分野:

    • 惑星科学 惑星科学
    • 大気物理学 大気物理学
    • スペクトル顕微鏡検査です.

    背景:

    • 火星の大気組成と動態を理解することは,惑星探査にとって極めて重要です.
    • 以前のミッションでは,紫外線による空気光と大気散乱に関する限られたデータしか得られなかった.

    研究 の 目的:

    • 火星の紫外線光スペクトルを測定する.
    • 大気中の放射能と反射力の変動を調査する.
    • 火星の大気中の塵の役割をモデル化するために.

    主な方法:

    • 1971年の30日間の軌道宇宙船の測定結果.
    • 一酸化炭素 (CO) の排出率の分析 キャメロンと4番目の陽性帯.
    • 原子酸素 (1304 Å) と原子水素 (1216 Å) の測定 高度の関数としてエアグローライン.
    • 下層大気の反射率のスペクトル光度測定.

    主要な成果:

    • 太陽活動と相関する,CO キャメロン帯の空気光のスケール高さの有意な変動が観察されました.
    • 観測期間中,原子酸素と水素の空気光線が一貫して検出されました.
    • 火星の大気反射率は1969年の測定値の約50%であり,粒子の散乱を示しています.
    • 紫外線吸収と光学深さ > 1 の塵でモデル化された反射率の変動.
    • 火星の極域の上の大気は,他の地域よりも澄んでいることが判明しました.

    結論:

    • 太陽の活動は,火星の一酸化炭素の空気の輝きのスケール高に影響します.
    • 原子酸素と水素は,火星上層大気の恒常成分である.
    • 火星の塵は,大気の散乱,特に紫外線スペクトルにおける重要な要因です.
    • 大気の澄度は地域によって異なるが,極域は塵によって遮られることが少ない.