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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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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...
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

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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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Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

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Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

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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...
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Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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Related Experiment Video

Updated: May 9, 2025

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Rotationally Resolved Spectroscopy of a Single Polyatomic Molecule.

Aaron Calvin1, Samuel Kresch1, Merrell Brzeczek1

  • 1University of California, Santa Barbara, Department of Physics, California 93106, USA.

Physical Review Letters
|May 2, 2025
PubMed
Summary
This summary is machine-generated.

Researchers achieved the first rotationally resolved spectrum of a single polyatomic molecular ion, the cyclopropenyl cation. This breakthrough in inelastic recoil spectroscopy enables new possibilities in astrochemistry and fundamental physics.

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Area of Science:

  • Molecular Spectroscopy
  • Physical Chemistry
  • Quantum Mechanics

Background:

  • Observing the spectrum of single molecules is challenging.
  • Previous techniques lacked sufficient resolution for polyatomic ions.

Purpose of the Study:

  • To achieve rotationally resolved spectra of a single polyatomic molecular ion.
  • To demonstrate enhanced spectral resolution using inelastic recoil spectroscopy (IRS).

Main Methods:

  • Utilized inelastic recoil spectroscopy (IRS).
  • Achieved a spectral resolution increase of approximately 10,000-fold.
  • Trapped and probed a single cyclopropenyl cation (c-C3H3+).

Main Results:

  • Obtained the first rotationally resolved spectrum of a single polyatomic molecular ion.
  • Resolved rotational-vibrational transitions of the cyclopropenyl cation.
  • Demonstrated high precision and sensitivity of the IRS technique.

Conclusions:

  • The enhanced IRS technique is a powerful tool for molecular analysis.
  • This method opens new avenues for astrochemistry, chiral detection, and fundamental physics tests.