The dynamics of exciton tunneling and trapping in condensed xenon on ultrafast time scales

Journal Article · Sun Aug 01 00:00:00 EDT 1993 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.465286· OSTI ID:6488203

Peterson, E S; Schwartz, B J; Harris, C B ^[1]

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1. Department of Chemistry, University of California, Berkeley, California 94720 (United States) Chemical Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)

We report the use of picosecond transient absorption spectroscopy to directly observe the dynamics of formation, tunneling, and subsequent cooling of the [ital n]=1, [Gamma](3/2) exciton in condensed xenon over a density range of 0.10 to 1.8 g/ml. At lower densities, only Xe[sup *][sub 2] excimers are formed, which undergo vibrational cooling on a tens of picoseconds time scale. At densities high enough to support exciton formation, tunneling from the free to the trapped exciton state takes place in [le]3 ps, and cooling of the localized exciton takes place in 5--10 ps; neither rate is strongly dependent on Xe density over the range investigated. The results are compared to theories that describe the formation and cooling rates of the trapped exciton state, and are consistent with a resonant energy transfer mechanism in which the excitation hops between neighboring Xe atoms during the trapping process.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6488203
• Journal Information: Journal of Chemical Physics; (United States), Vol. 99:3; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
XENON
EXCITONS
ABSORPTION SPECTRA
DENSITY
SOLIDS
TIME RESOLUTION
TRAPPING
TUNNEL EFFECT
VIBRATIONAL STATES
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
GASES
NONMETALS
PHYSICAL PROPERTIES
QUASI PARTICLES
RARE GASES
RESOLUTION
SPECTRA
TIMING PROPERTIES
360606* - Other Materials- Physical Properties- (1992-)