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Related Concept Videos

Sound Waves: Interference00:53

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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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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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Interference and Superposition of Waves01:07

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When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
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Updated: Jul 25, 2025

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Destructive interference in N2+ lasing.

Hongbing Liu, Hongqiang Xie, Guihua Li

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    |June 29, 2023
    PubMed
    Summary
    This summary is machine-generated.

    We observed that R-branch nitrogen lasing (N2+) at 391 nm can be stronger than P-branch lasing. This difference is due to destructive interference affecting P-branch lasing, not R-branch, at certain pressures.

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    Area of Science:

    • Physics
    • Spectroscopy
    • Quantum Optics

    Background:

    • Nitrogen lasing (N2+) at 391 nm is a key phenomenon in atmospheric and plasma physics.
    • Understanding rotational state contributions is crucial for controlling laser output.
    • Previous studies have focused on overall intensity rather than resolved rotational branches.

    Purpose of the Study:

    • To investigate the unexpected dominance of R-branch lasing intensity over P-branch intensity in rotation-resolved N2+ lasing.
    • To elucidate the underlying physical mechanisms responsible for this intensity disparity.
    • To explore methods for manipulating air lasing intensity.

    Main Methods:

    • Experimental measurement of rotation-resolved N2+ lasing intensity.
    • Analysis of pump-probe delay dependence for lasing dynamics.
    • Measurement of rotation-resolved polarization.
    • Exclusion of rotational coherence as a primary factor.

    Main Results:

    • R-branch lasing intensity from a single rotational state significantly exceeded the total P-branch lasing intensity.
    • Destructive interference, attributed to propagation effects, was identified as the cause for reduced P-branch intensity.
    • R-branch lasing remained largely unaffected due to its discrete spectral characteristics.

    Conclusions:

    • The study reveals a novel mechanism influencing air lasing intensity based on spectral properties and propagation effects.
    • Destructive interference in P-branch lasing is a key factor in observed intensity differences.
    • Findings offer a new pathway for controlling and enhancing air lasing.