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Related Concept Videos

Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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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...
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NMR Spectroscopy: Chemical Shift Overview01:15

NMR Spectroscopy: Chemical Shift Overview

2.6K
The position of the absorption signal of a sample is reported relative to the position of the signal of tetramethylsilane (TMS), which is added as an internal reference while recording spectra. The difference between the absorption frequencies of the sample and TMS (in Hz) is divided by the spectrometer operating frequency (in MHz) to obtain a dimensionless quantity called the chemical shift. It is reported on the δ (delta) scale and expressed in parts per million.
For instance, the proton...
2.6K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.2K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.2K
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

1.1K
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...
1.1K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.2K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Vibrational Frequency Used as Internal Clock Reference to Access Molecule-Metal Charge-Transfer Times.

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  • 1Fachbereich Physik und Wissenschaftliches Zentrum für Materialwissenschaften der Philipps-Universität Marburg, Renthof 5, 35032 Marburg, Germany.

Physical Review Letters
|April 2, 2021
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Dynamical charge transfer at molecule-metal interfaces, crucial for optoelectronics, can now be studied using vibrational excitations. This method reveals charge transfer timescales by observing asymmetric line shapes from electron-vibron coupling.

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Area of Science:

  • Surface science and condensed matter physics.
  • Investigating ultrafast interfacial charge dynamics.

Background:

  • Charge transfer at molecule-metal interfaces is vital for optoelectronic devices, occurring on femtosecond timescales.
  • Understanding charge transfer at the Fermi energy in electronic ground states remains challenging.

Purpose of the Study:

  • To demonstrate a method for accessing and characterizing dynamical charge transfer at the Fermi energy.
  • To utilize vibrational excitations to probe ultrafast interfacial electron dynamics.

Main Methods:

  • Employing vibrational excitations to induce and observe charge transfer.
  • Analyzing nonadiabatic electron-vibron coupling effects.
  • Interpreting distinct asymmetric line shapes in spectroscopic data.

Main Results:

  • Observed distinct asymmetric line shapes resulting from nonadiabatic electron-vibron coupling.
  • Established a method to probe charge transfer dynamics at the Fermi level.
  • Utilized vibrational oscillations as an internal clock to determine charge transfer timescales.

Conclusions:

  • Vibrational excitations provide a novel route to study interfacial charge transfer dynamics at the Fermi energy.
  • Electron-vibron coupling signatures offer insights into the characteristic timescales of these processes.
  • This approach enhances understanding of fundamental processes relevant to optoelectronic device functionality.