Observation of a barium xenon exciplex within a large argon cluster

Abstract

Spectroscopic measurements provide fluorescence and excitation spectra of a single barium atom codeposited with xenon atoms on argon clusters of average size approximately 2000. The spectra are studied as a function of the number of xenon atoms per cluster. The excitation spectrum with approximately 10 xenon atoms per cluster is qualitatively similar to that observed when no xenon atom is present on the cluster. It consists of two bands located on each side of the 6s6p (1)P-6s(2) (1)S resonance line of the free barium. In contrast, the fluorescence spectrum differs qualitatively since a barium-xenon exciplex is observed, which has no counterpart in xenon free clusters. In particular an emission is observed, which is redshifted by 729 cm(-1) with respect to the Ba(6s6p (1)P-6s(2) (1)S) resonance line.

Spectroscopy of 3, 4, 9, 10-perylenetetracarboxylic dianhydride (PTCDA) attached to rare gas samples: Clusters vs. bulk matrices. II. Fluorescence emission spectroscopy

“…17 More recently, the formation of barium-xenon exciplexes on the surface of large argon clusters could be demonstrated. 18 However, recent measurements in our group pointed out that this surface mobility does not apply to larger PAHs such as PTCDA and that the molecules stay isolated from each other. 15 The chromophore used in the present work is the PTCDA molecule (C 24 H 8 O 6 ).…”

Absorption spectroscopy of heavy alkaline earth metals Ba and Sr in rare gas matrices—CCSD(T) calculations and atomic site occupancies

“…The literature on the spectroscopy of matrix-isolated barium is quite limited-a surprising situation considering the direct connection between rare gas (RG) matrix work and studies probing the behaviour of atomic barium in a variety of environments including He-nanodroplets, 1,2 solid and liquid helium, 3 and isolated on large rare gas clusters. [4][5][6] A wealth of data has been accumulated from these related systems yielding insights, for example, into the excited P states forming bubbles in liquid helium or size exclusion effects forcing surface attachment on Ar clusters. Further compounding the lack of published work, the limited literature that does exist on matrixisolated atomic barium is in error in several regards.…”

One and Two-Electron Investigation of Electronic Structure for Ba+Xe and BaXe van der Waals Molecules in a Pseudopotential Approach

“…Theoretical and experimental studies of heavy metals interacting with rare gas atoms are attracting the interest of an important number of researchers. − This is due, in part, to the importance of understanding the behavior of heavy metals in these van der Waals complexes and, in part, to the physical interest in comparing theoretical predictions with the experimental deduced interatomic potentials between atoms. Recently potential energy curves have been produced for the heavy metal/rare gas complexes Cd + -RG and Hg + -RG and were also used to determine transport coefficients.…”