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関連する概念動画

Emission Spectra02:39

Emission Spectra

When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
Interaction of EM Radiation with Matter: Spectroscopy01:12

Interaction of EM Radiation with Matter: Spectroscopy

Electromagnetic (EM) radiation can be considered an oscillating electric and magnetic field propagating through a medium that can interact with matter in its path. The electric field in the radiation can interact with electrical charges in the atoms or molecules in the matter. On the other hand, the magnetic field can interact with the magnetic field in the atomic nucleus. The study of the interaction between electromagnetic radiation and matter is termed spectroscopy. Spectroscopy is the study...
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.
Momentum And Radiation Pressure01:20

Momentum And Radiation Pressure

An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container. Nichols...
Radiation Pressure: Problem Solving01:09

Radiation Pressure: Problem Solving

The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force per...
Mass Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...

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関連する実験動画

Updated: Jun 24, 2026

Measuring Spatially- and Directionally-varying Light Scattering from Biological Material
11:57

Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

Published on: May 20, 2013

小惑星ベスタ:スペクトル反射性と構成上の影響

T B McCord, J B Adams, T V Johnson

    Science (New York, N.Y.)
    |June 19, 1970
    PubMed
    まとめ
    この要約は機械生成です。

    この研究は,小惑星ヴェスタ,パラス,セレスに対する最初のスペクトル反射度測定を提示しています. ヴェスタは独特の吸収帯を示しており,ベースタルトアコンドライトに似た表面組成を示唆している.

    さらに関連する動画

    Scattering And Absorption of Light in Planetary Regoliths
    11:34

    Scattering And Absorption of Light in Planetary Regoliths

    Published on: July 1, 2019

    Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
    08:01

    Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

    Published on: November 21, 2019

    関連する実験動画

    Last Updated: Jun 24, 2026

    Measuring Spatially- and Directionally-varying Light Scattering from Biological Material
    11:57

    Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

    Published on: May 20, 2013

    Scattering And Absorption of Light in Planetary Regoliths
    11:34

    Scattering And Absorption of Light in Planetary Regoliths

    Published on: July 1, 2019

    Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
    08:01

    Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

    Published on: November 21, 2019

    科学分野:

    • 惑星科学は惑星科学である.
    • スペクトル顕微鏡検査です.
    • ミネラロジーは,鉱物学です.

    背景:

    • 小惑星の表面構成は,初期の太陽系についての洞察を提供します.
    • これまでの小惑星のスペクトルデータは,特に0.30~1.10ミクロンの範囲では限られていた.

    研究 の 目的:

    • 小惑星ヴェスタ,パラス,セレスのスペクトル反射率を初めて測定した.
    • 特徴的な吸収帯を特定し,既知の鉱物学的組成と比較する.

    主な方法:

    • スペクトル反射性の測定は,紫外線から近赤外線スペクトル (0.30〜1.10ミクロン) にわたって行われました.
    • 小惑星のスペクトルの比較と隕石の実験室測定とアポロ月のサンプル.

    主要な成果:

    • ヴェスタは0.9ミクロンで強い吸収帯,0.5-0.6ミクロンで弱い吸収帯を示し,紫外線の反射力が低下しています.
    • パララスとおそらくセレスには,顕著な0.9ミクロンの吸収帯が欠けている.
    • ヴェスタの吸収帯は,マグネシウムピロキセンの亜鉄に起因する,固体太陽系天体で観測された中で最も強いものです.

    結論:

    • ヴェスタの表面の組成は,特定の玄武岩アコンドライト隕石と非常に似ています.
    • ヴェスタのユニークなスペクトル特徴は,その地質の歴史と起源に関する重要な手がかりを提供します.
    • 比較スペクトロスコピーは,小惑星鉱物学を理解するための強力なツールです.