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Photofragment helicity caused by matter-wave interference from multiple dissociative states

Rakitzis1, Kandel, Alexander

  • 1Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA.

Science (New York, N.Y.)
|August 28, 1998
PubMed
Summary

The study reveals that the handedness of electronic angular momentum in iodine monochloride (ICl) photodissociation oscillates with light wavelength. This oscillation, driven by matter-wave interference, allows probing of molecular excited states.

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Area of Science:

  • Physical Chemistry
  • Molecular Spectroscopy
  • Quantum Dynamics

Background:

  • Iodine monochloride (ICl) molecules are studied for their photodissociation dynamics.
  • Understanding the electronic angular momentum of photofragments is crucial for molecular reaction dynamics.

Purpose of the Study:

  • To investigate the helicity of ground-state Cl atom photofragments resulting from ICl photodissociation.
  • To explore the relationship between light wavelength and the observed helicity.
  • To demonstrate the possibility of probing repulsive electronic states via spectroscopic methods.

Main Methods:

  • Isolated ICl molecules were photodissociated using linearly polarized light.
  • Ground-state Cl atom photofragments were detected using a method sensitive to electronic angular momentum helicity.

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Main Results:

  • The helicity of the Cl atom photofragments was observed to oscillate between 'topspin' and 'backspin'.
  • This oscillation was found to be dependent on the wavelength of the dissociating light.
  • The observed helicity originates from the de Broglie matter-wave interference of multiple dissociating pathways.

Conclusions:

  • The wavelength-dependent oscillation of helicity provides insights into the dissociating pathways of ICl electronic excited states.
  • Spectroscopic measurements of photofragment helicity can be used to determine the identity and shapes of repulsive states.