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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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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.
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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.
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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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Molecular Orientation-Induced Second-Harmonic Generation: Deciphering Different Contributions Apart.

Amit Beer1,2, Ran Damari1,2, Yun Chen1

  • 1Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University, Tel Aviv 6997801, Israel.

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|June 2, 2022
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Summary

We developed a new all-optical method, MOISH, to monitor molecular orientation dynamics in gases. This technique selectively reveals electronic and nuclear contributions to nonlinear optical signals, enabling advanced rotational control.

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Area of Science:

  • Nonlinear optics
  • Molecular dynamics
  • Laser spectroscopy

Background:

  • Monitoring molecular orientation dynamics is crucial for understanding chemical reactions and material properties.
  • Existing techniques often lack sensitivity or spatial localization for gas-phase studies.

Purpose of the Study:

  • To introduce and validate an all-optical technique for direct monitoring of orientation dynamics in gas-phase molecular ensembles.
  • To differentiate electronic and nuclear contributions to nonlinear optical signals.

Main Methods:

  • Utilizing the "MOISH" (Molecular Orientation Imaging via Second-Harmonic) technique.
  • Exploiting transiently lifted inversion symmetry in polar gas media.
  • Employing a "reporter gas" approach for signal deciphering.

Main Results:

  • Demonstrated sensitive and spatially localized probing of second-harmonic generation.
  • Successfully revealed and distinguished selective electronic and nuclear dynamical contributions.
  • Established a direct correlation between the second-harmonic generation signal and gas orientation.

Conclusions:

  • MOISH offers a novel and effective means for studying molecular orientation dynamics in gases.
  • The technique provides insights into electronic and nuclear contributions to nonlinear optical signals.
  • Enables advanced coherent rotational control through combined terahertz and optical field excitation.