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Cs*He(n) exciplexes in solid 4He.

P Moroshkin1, A Hofer, D Nettels

  • 1Département de Physique, Université de Fribourg, Chemin du Musée 3, 1700 Fribourg, Switzerland. peter.moroshkin@unifr.ch

The Journal of Chemical Physics
|January 21, 2006
PubMed
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We studied cesium-helium exciplexes in solid helium, identifying Cs*He2 and larger ring complexes. Our theoretical model explains the observed laser-induced emission spectra.

Area of Science:

  • Atomic and Molecular Physics
  • Condensed Matter Physics
  • Laser Spectroscopy

Background:

  • Exciplex formation in solid helium is not well understood.
  • Cesium (Cs) interactions with helium (He) are crucial for studying exotic atomic systems.
  • Laser-induced processes offer a method to probe these interactions.

Purpose of the Study:

  • To investigate the laser-induced formation and emission spectra of Cs*He(n) exciplexes.
  • To identify the structures and electronic states of these exciplexes in solid helium.
  • To develop a theoretical model for interpreting experimental observations.

Main Methods:

  • Theoretical modeling of exciplex formation and properties.
  • Experimental laser spectroscopy in hexagonal close-packed (hcp) and body-centered cubic (bcc) solid helium.

Related Experiment Videos

  • Analysis of emission spectra to identify molecular species and states.

    • Main Results:

    • Detection of a linear triatomic Cs*He2 exciplex in two electronic states (APi(1/2) and BPi(3/2)).
    • Observation of larger Cs*He(n) complexes with six or seven He atoms forming a ring around Cs in the 6P(1/2) state.
    • Successful interpretation of experimental spectra using a developed theoretical model.

    Conclusions:

    • The study elucidates the nature of Cs*He(n) exciplexes in solid helium phases.
    • The findings provide insights into laser-induced processes and exciplex spectroscopy in condensed rare gases.
    • The theoretical model serves as a valuable tool for understanding similar systems.