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Emission Spectra02:39

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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.
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Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency...
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Atomic Emission Spectroscopy: Overview01:20

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
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IR Absorption Frequency: Delocalization01:04

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Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
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C IV吸収複合体周辺のコンパクト [C II]エミーターは赤偏移 5.7

Daichi Kashino1,2, Simon J Lilly3, Robert A Simcoe4

  • 1Institute for Advanced Research, Nagoya University, Nagoya, Japan. kashinod.astro@gmail.com.

Nature
|May 10, 2023
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まとめ

赤い偏移5.7の近くの2つの [C sup II]を放射する銀河を検出しました 高イオン化ガスのシステムに関連しています これらの銀河は,コンパクトなサイズと狭い線幅を示し,宇宙再イオン化中に星形成が隠されていることを示唆しています.

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科学分野:

  • 宇宙再イオン化
  • 銀河の進化について
  • 銀河間媒体の物理

背景:

  • 銀河周りの環境条件はクエーザーの吸収線を用いて調査される.
  • ガスイオン化状態と銀河の性質との関連が示唆されている.
  • 宇宙再イオン化は 吸収システムに世界的な変化を伴う

研究 の 目的:

  • 銀河周りの物理的条件を調査する
  • [C sup II]の放出と銀河の性質の関係を探求する.
  • 宇宙再イオン化中の高イオン化状態を理解するために

主な方法:

  • 背景クエーサースペクトルの間接吸収線システムの分析.
  • 赤偏差 z ≈ 5.7 で [C sup II] を発する銀河の検出
  • 水力学シミュレーションとの比較

主要な成果:

  • 2つの[C sup II]を放射する銀河がz ≈ 5.7で検出され,高イオン化C sup IVシステムに関連している.
  • 検出された銀河は,コンパクトなサイズ (<2.4 kpc) と狭い線幅 (FWHM ≈ 62-64 km/s) の超密度の一部です.
  • [C sup II]の放射源がひどく遮蔽されていることを示唆している.

結論:

  • この発見は[C sup II]放射特性,銀河の過剰密度,高ガスイオン化状態との関連を示唆している.
  • 狭い [C sup II]放射は,加熱された冷たい中性媒体の塊またはコンパクトな光解離領域から発生する可能性があります.
  • 初期の銀河の星形成の 深刻な遮蔽が示されている.