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IR Spectrum Peak Broadening: Hydrogen Bonding01:23

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The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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Shape Resonances in H_{2} as Photolysis Reaction Intermediates.

K-F Lai1, E J Salumbides1, W Ubachs1

  • 1Department of Physics and Astronomy, LaserLaB, Vrije Universiteit De Boelelaan 1081, 1081 HV Amsterdam, Netherlands.

Physical Review Letters
|November 12, 2021
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Summary
This summary is machine-generated.

Researchers measured shape resonances in hydrogen molecules (H_{2}) using a half-collision approach. These findings, observed for the first time in neutral atom collisions, agree with advanced theoretical predictions.

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Area of Science:

  • Atomic and Molecular Physics
  • Quantum Chemistry
  • Spectroscopy

Background:

  • Shape resonances in H_{2} are transient reaction intermediates formed during H_{2}S photolysis.
  • Understanding these resonances is crucial for probing molecular interactions and quantum effects.

Purpose of the Study:

  • To experimentally measure shape resonances in H_{2} using a half-collision approach.
  • To investigate the role of nonadiabatic and quantum electrodynamical corrections in these resonances.
  • To determine the s-wave scattering length for singlet H(1s)+H(1s) scattering.

Main Methods:

  • Utilized a half-collision approach involving two-photon Doppler-free excitation of H_{2}.
  • Measured resonances for specific angular momentum states (J=13, 15, 17, 19, 21).
  • Achieved high accuracy (30 MHz or 1.4 mK) in resonance position measurements.

Main Results:

  • Observed resonances with lifetimes ranging from nanoseconds to milliseconds.
  • Experimental resonance positions showed excellent agreement with theoretical predictions including nonadiabatic and QED corrections.
  • This marks the first observation of such effects in neutral atom collisions.

Conclusions:

  • The study validates theoretical models for H_{2} interactions at high accuracy.
  • The potential energy curve of H_{2} is precisely tested over a broad range of internuclear separations.
  • The singlet H(1s)+H(1s) s-wave scattering length was determined to be a=0.2735_{31}^{39} a_{0}.