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Chinese Physics B

Density-dependent photoabsorption cross sections of atomic Xe

Xiao‐Guang Ma

Published Jan 1, 2009• 3 citations
Publisher

Abstract

The evolution of the photoabsorption cross sections of atomic xenon with number densities varying from ideal gas to condensed matter has been studied by an alternative view in the present work. The alternative expressions of the photoabsorption cross sections presented by Sun et al recently were used with the local field models that has proven to be generalized easily to multiatomic systems including molecules and condensed phase systems. The present results show that the variation of the photoabsorption cross sections of atomic xenon in the giant resonance region from the isolated to the condensed conditions is very small, which agrees well with the variation law of the solid and gas experiments.

DOI
10.1088/1674-1056/18/1/025

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The evolution of the photoabsorption cross sections of atomic xenon with number densities varying from ideal gas to condensed matter has been studied by an alternative view in the present work. The alternative expressions of the photoabsorption cross sections presented by Sun et al recently were used with the local field models that has proven to be generalized easily to multiatomic systems including molecules and condensed phase systems. The present results show that the variation of the photoabsorption cross sections of atomic xenon in the giant resonance region from the isolated to the condensed conditions is very small, which agrees well with the variation law of the solid and gas experiments.
The influence of the local-field on the photoabsorption cross section of the atomic silver is studied in detail by using the Clausius–Mossotti (CM) model and the Onsager model separately. The variations of the photoabsorption cross section of atomic silver with number density and radius of the environmental interaction cavity are studied systematically by using more general expressions for the photoabsorption cross sections, proposed by Sun et al recently. It has proved to be reasonable to model the optical response properties of bulky material by coupling the property of isolated atom with the environmental effects in the present work.
The strong interatomic interaction effects on photoabsorption cross sections of a private atom have been interpreted by the contribution of both the real and imaginary parts of atomic polarizability in the present work. Some unresolved differences between the photoabsorption cross sections of isolated atoms and those of condensed atoms, especially near thresholds and resonances, probably could be interpreted by the competition between the imaginary and real parts of atomic frequency-dependent polarizabilities.
Thermal collisions between laser excited Xe(nf) Rydberg atoms and a variety of neutral atomic and molecular targets have been investigated. In Xe(nf)-HF collisions, n-changing, 4-changing and collisional ionization were observed. For n = 26 and 27, absolute collisional cross sections for these processes have been determined using time-resolved selective field ionization. In addition, the first evidence of molecular rotational excitation through the transfer of energy of electronic excitation from a Rydberg atom is presented. In Xe(nf) - Xe, Kr, Ar, CO2, CO and N2 collisions the dominant mechanism was observed to be 4-changing: no evidence of n-changing or collisional ionization was apparent. Absolute collisional cross sections have been determined for a range of n between 24 and 37. Comparison of these cross sections with those obtained using a theoretical model in which effects due to the Rydberg core are ignored appears to lead to satisfactory results only for Xe, Kr and CO2, whereas when core effects are included satisfactory agreement between experiment and theory is found in all cases.
Two-photon absorption cross sections of ground-state xenon atoms to the 2p5{p}_{5}p5​(J=0), 2p6{p}_{6}p6​(J=2), and 2p9{p}_{9}p9​(J=2) states in the 5${p}^{5}6pconfigurationandphotoionizationcrosssectionsat193and248nmfromthe26p configuration and photoionization cross sections at 193 and 248 nm from the 26pconfigurationandphotoionizationcrosssectionsat193and248nmfromthe2{p}_{5}$ and 2p6{p}_{6}p6​ states have been determined and are compared with previous experimental and theoretical values where such exist. Fluorescence depletion spectroscopy as a method for determining excited-state photoionization cross sections is described and discussed and shown to have many attractive features. Based on our cross-section measurements, we calculate that (2+1)-photon photoionization in Xe with a laser intensity of 30 MW/cm2{\mathrm{cm}}^{2}cm2 during 25 ns at 249.6 nm, using the 2p5{p}_{5}p5​(J=0) state as an intermediate state, can produce a fractional ionization of 10%.
Photoabsorption method has been applied to Rb-Xe system to observe collision-induced dipole (CID) transitions 5 s - n s ( n =10 and 11), - n d ( n =8 to 16) and - n q ( n =7 to 15), where q stands for the manifold states or l ≥3. Measured shift is almost constant (≃14 cm -1 ) for 5 s - n d , whereas it decreases from 41 to 10 cm -1 for 5 s - n q as n increases. Measured effective oscillator strength per unit xenon density f CID /[Xe] (10 -27 cm 3 ) decreases from 35 to 2 for 5 s - n d and from 64 to 34 for - n q as n increases. The f CID /[Xe] values of rubidium are quantitatively explained by the theory that takes account of the energy dependence of the s -wave amplitude for electron-xenon scattering.