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関連する概念動画

IR Spectrum Peak Broadening: Hydrogen Bonding01:23

IR Spectrum Peak Broadening: Hydrogen Bonding

The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular hydrogen bonding...
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...
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,...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to the...
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...

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関連する実験動画

Updated: May 23, 2026

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
09:40

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown

Published on: February 14, 2014

寒いクラスターで水の拡散OHの振動スペクトルを拡張する

Nan Yang1, Chinh H Duong1, Patrick J Kelleher1

  • 1Sterling Chemistry Laboratory, Yale University, New Haven, CT 06520, USA.

Science (New York, N.Y.)
|April 20, 2019
PubMed
まとめ
この要約は機械生成です。

Cs+·(D2O) 20イオンケージ内の水分子を調査すると,水素結合構造がそれらのスペクトルサインにどのように影響するか明らかになる. この研究では,ヒドロキシ群 (OH) 周波数とアンハーモニック貢献の場所依存の相関が詳細に示されています.

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Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
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関連する実験動画

Last Updated: May 23, 2026

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
09:40

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown

Published on: February 14, 2014

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10:28

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科学分野:

  • 物理化学
  • スペクトロスコーピー
  • 材料科学

背景:

  • 水の分散した振動スペクトルは,個々のヒドロキシ群 (OH) 振動器に対する水素結合効果の理解を妨げています.
  • 水の水素結合ネットワークの特徴は 多くの化学的,生物学的プロセスに不可欠です

研究 の 目的:

  • 定義された水素結合環境内の個々の水分をスペクトル的に識別する.
  • 特定の水素結合のトポロジをOH振動器の振動周波数と相関させる.
  • 水の振動スペクトルへのアンハーモニックの貢献を定量化するために.

主な方法:

  • 冷たい,同位体で標識された水クラスターイオン (H2OとD2O) を利用する.
  • 単一のH2O分子をCs+·(D2O) 20のクラスラートのようなケージ構造に埋め込む.
  • 赤外線 (IR) のスペクトルシグネチャを分析してOH群の振動を検出する.

主要な成果:

  • 水分子のスペクトルシグネチャーを 異なる場所に観測した.
  • 単一の水分子の2つのOH群の頻度間の場所依存の相関が確立された.
  • 低エネルギースペクトル帯に 結合されたOH群を特定した.
  • 同質な線幅を明らかにし,分子内屈曲と分子間モードへの非調和的結合を定量化しました.

結論:

  • この研究は,水素結合トポロジが個々の水分子振動にどのように影響するかの直接的なスペクトル証拠を提供します.
  • 場所特有の分析により,異なるOHオシレータからのスペクトル寄与を詳細に理解できます.
  • アハーモニー効果の定量化により,水群の振動エネルギー流の洞察が得られます.