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Related Concept Videos

¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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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.
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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...
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

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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.
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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Related Experiment Video

Updated: Dec 21, 2025

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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High harmonic interferometry of multi-electron dynamics in molecules.

Olga Smirnova1, Yann Mairesse, Serguei Patchkovskii

  • 1[1] National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada [2] Max-Born Institute, 2a Max-Born-Strasse, Berlin D-12489, Germany.

Nature
|July 24, 2009
PubMed
Summary
This summary is machine-generated.

High harmonic interferometry reveals molecular orbital fingerprints and attosecond electron dynamics. This technique decodes complex electron behavior in molecules with unprecedented spatial and temporal resolution.

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Area of Science:

  • Quantum optics
  • Molecular physics
  • Attosecond science

Background:

  • High harmonic emission (HHE) arises from electron dynamics in intense laser fields.
  • HHE light properties encode molecular structure and dynamics.

Purpose of the Study:

  • To demonstrate high harmonic interferometry (HHI) for retrieving molecular information.
  • To decode attosecond multi-electron dynamics in CO2 molecules.

Main Methods:

  • Utilizing high harmonic interferometry (HHI) on CO2 molecules.
  • Measuring amplitudes and phases of harmonic light emission.

Main Results:

  • Revealed fingerprints of multiple molecular orbitals involved in HHE.
  • Decoded attosecond multi-electron dynamics, including electron rearrangement upon ionization.
  • Achieved sub-Angström spatial and attosecond temporal resolution.

Conclusions:

  • HHI is an effective method for studying electron dynamics.
  • This technique offers high spatial and temporal resolution for molecular systems.