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関連する概念動画

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
Electromagnetic Waves01:30

Electromagnetic Waves

James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws of electricity and...
Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in the...
Sampling Theorem01:15

Sampling Theorem

In signal processing, the analysis of continuous-time signals, denoted as x(t), often involves sampling techniques to convert these signals into discrete-time signals. This process is essential for digital representation and manipulation. A critical component in sampling is the train of impulses, characterized by the sampling interval and the sampling frequency. The relationship between these parameters and the original signal's properties dictates the success of the sampling process.
Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next sampling...
Aliasing01:18

Aliasing

Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original signal...

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Updated: Jul 17, 2026

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
13:31

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

Published on: December 22, 2015

キラル総周波数スペクトロスコーピーの方へ

Na Ji1, Victor Ostroverkhov, Mikhail Belkin

  • 1Department of Physics, University of California at Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

Journal of the American Chemical Society
|July 6, 2006
PubMed
まとめ

研究者らは,キラル総周波数 (SF) スペクトロスコピーを実証し,初めて実際のSFスペクトル応答成分と想像上のSFスペクトル応答成分の両方を測定しました. 1,1'-bi-2-naphtholを使用するこの技術は,分子構成と適合性を決定するのに役立ちます.

科学分野:

  • 非線形光学は,非線形光学である.
  • スペクトル顕微鏡検査です.
  • カイロプティカル・メソッド

背景:

  • 総周波数 (SF) スペクトロスコピーは,表面やインターフェースを研究するための強力な技術です.
  • SF応答の実際の構成要素と想像上の構成要素の両方を測定することで,より包括的なスペクトル情報が得られます.
  • これまでのキラルSFスペクトロスコピーの方法は,提供できる情報が限られていた.

研究 の 目的:

  • SFスペクトル応答の実際の構成要素と想像上の構成要素の両方を測定できる新しいキラル総周波数 (SF) スペクトロスコピー技術を実証する.
  • よく特徴づけられたキラル分子,1.1 -bi-2-naphthol (BN) を用いてテクニックを検証する.
  • 絶対的構成と適合を決定するキラルSFスペクトルの有用性を示す.

主な方法:

  • SF信号の干渉を分散しないSF参照で基にしたキラルSFスペクトルスコピーの方法の開発.
  • 1.1 -bi-2-ナフトール (BN) の溶液に対する技術の適用.
  • BNの最初のエクシトン-スプリットトランジションにおけるキラルSFスペクトルの獲得.

主要な成果:

  • リアルコンポーネントとイマジナリコンポーネントの両方を測定するキラルSFスペクトロスコピーの実証.

さらに関連する動画

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
09:36

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

Published on: June 25, 2021

関連する実験動画

Last Updated: Jul 17, 2026

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
13:31

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

Published on: December 22, 2015

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
09:36

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

Published on: June 25, 2021

  • 1,1 -bi-2-ナフトール (BN) の最初のエクシトン-スプリットトランジションで得られたキラルSFスペクトル.
  • 得られたスペクトルは,BNのキラル特性に関する詳細な情報を提供します.

    • 結論:

    • 実証されたキラルSFスペクトロスコピー技術は,カイロプティカル・メソッドの重要な進歩です.
    • この技術は,キラル分子のより徹底的な特徴付けを可能にします.
    • キラルSFスペクトルは,キラル分子の絶対的構成と構成を決定するのに価値があります.