関連する実験動画
Updated: Jul 12, 2026

09:20
Picoinjection of Microfluidic Drops Without Metal Electrodes
Published on: April 18, 2014
まとめ
天文学者は,イオのナトリウム雲の最初の直接画像を撮影し,バナナ形の構造が10万km以上広がっていることを明らかにしました. ナトリウム原子は主にイオに先行し,月の表面から局所的な脱出を示唆しています.
科学分野:
- 惑星科学は惑星科学である.
- 宇宙物理学 宇宙物理学
- 天文学 天文学
背景:
- 木星の火山活動のある月イオは,薄い大気とエクソスフィアを持っています.
- 以前の観測は,ナトリウムの存在を暗示していたが,直接的なイメージングは欠けていた.
研究 の 目的:
- イオのナトリウムエクソスフィアの最初の直接画像を取得し,分析する.
- ナトリウム雲の空間的分布と形態を特徴づけるために.
主な方法:
- Io.のナトリウム排出量を捕捉するために,直接イメージング技術が採用されました.
- フォトメトリック分析を使用して,ナトリウム雲の強度分布を決定しました.
主要な成果:
- 最初の直接的な画像は,Ioの軌道に沿って10 ^ 5 kmにわたって広がる部分的なトロイドナトリウム雲を明らかにしました.
- 雲は独特の"バナナ形"を示し,イオの先行する方がイオの後に続くよりも多くのナトリウム原子が検出されました.
- イオの表面からの局所的なナトリウム脱出のモデルは,観測されたデータにうまく適合した.
結論:
- イオのナトリウム雲の観測された形態学は,ナトリウムが脱出するための局所的なソースメカニズムをサポートしています.
- イオの表面からの同位体脱出は,観察されたナトリウム原子の分布を十分に説明できない.
関連する概念動画
Precipitation of Ions
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
Ions, Molecules, and Compounds
Ions - When an atom participates in a chemical reaction that results in the donation or acceptance of one or more electrons, the atom becomes positively or negatively charged. This frequently happens for most atoms to have a full valence shell. This can happen either by gaining electrons to fill a shell that is more than half-full or by giving away electrons to empty a shell that is less than half-full, thereby leaving the next smaller electron shell as the new, full valence shell. An atom with...
Ions and Ionic Charges
In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called ions.
Photosystem I
Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
Ionic Crystal Structures
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Ionization Energy
The amount of energy required to remove the most loosely bound electron from a gaseous atom in its ground state is called its first ionization energy (IE1). The first ionization energy for an element, X, is the energy required to form a cation with 1+ charge:

