関連する実験動画

Updated: Aug 6, 2025

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Published on: May 27, 2018

カーボンテトラクロライドによるヤーン=テラー地形図の超高速画像化

Max D J Waters¹, Zi Xuan Ng¹, Nicholas R Monahan¹

¹Laboratory for Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland.

Journal of the American Chemical Society

|March 23, 2023

まとめ

カーボンテトラ塩化物におけるジャン=テラー効果によって超高速なダイナミクスを直接観測しましたこの研究は,時間解像度光電子スペクトロスコーピーを用いて,ヤーン-テラー円交差点の局所的な地形を明らかにします.

科学分野:

化学物理学
分子力学
スペクトロスコーピー

背景:

Jahn-Teller効果は分子対称性と電子構造において重要な現象である.
化学反応や物質の性質を制御する鍵となるのが超高速ダイナミクスです

研究の目的:

カーボン四塩化物におけるジャン=テラー効果によって引き起こされる超高速のダイナミクスを直接観察し,特徴づけること.
Jahn-Teller円交差点の局所的な地形をリアルタイムでマッピングする.

主な方法:

真空紫外線フェムト秒源を使用した時間解像度光電子スペクトル.
炭素四塩化物の高位ライドバーグ状態の調製
核運動分析のための時間依存密度関数理論 (TD-DFT) 計算.

主要な成果:

Jahn-Teller効果に関連した超高速ダイナミクスの直接観測.
主要な核運動としてCCl4 t2曲げモードの識別.
Jahn-Teller 円形の交差点地域の局所的な地形をマッピングする.

結論:

この研究はヤーン・テラーによるダイナミクスの前例のない洞察力をもたらします
フェムトセカンドスペクトロスコーピーは自発的な対称性破裂と分子歪みを明らかにしています
強いビブロニックカップリングにより観測された興奮状態の信号の超高速崩壊.

さらに関連する動画

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry

Published on: March 4, 2021

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

関連する概念動画

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...

Atomic Force Microscopy

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.

Double Resonance Techniques: Overview

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

¹H NMR of Labile Protons: Temporal Resolution

¹H NMR of Labile Protons: Temporal Resolution

Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...

Total Internal Reflection Fluorescence Microscopy

Total Internal Reflection Fluorescence Microscopy

Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.