Xenon photon energy

Many features typical of atomic inner-shell photoexcitation with its autoionization decay have been explored for the case of 4d - np excitation in xenon. Though the 4d5/2 -> 6p resonance at 65.11 eV photon energy is just outside the energy range shown in Fig. 5.1, it will be considered here because it can be treated as an isolated resonance, and is the best-studied case the 4d5/2 - 7p resonance seen in Fig. 5.1 at 66.37 eV photon energy shows rather similar features. The notation 4d5/2 -> 6p is an abbreviation for... 

Figure 5.5 Relative intensities of xenon photosatellites as functions of photon energy, in the region of 4d - np excitations (a) 4d105s25p4(1S0)7p 2P° satellite (b) 4d105s25p4(1S0)8p 2P° satellite. The energy positions of 4d5/2 - np excitations are indicated by the vertical lines, numbered n = 7,8,9,.... For a detailed explanation of the effect that these resonance excitations have on the satellite intensities see main text for a related study see [BSK89b].

Figure 5.22 Reduced matrix elements dy, in atomic units, and relative phases (<5y — <5V), in radians, as functions of photon energy for 5p photoionization in xenon leading to the 5p5 2P3/2 final ionic state. The dashed vertical lines give the 2P3/2 and 2P,/2 ionization thresholds at 12.13 and 13.44 eV, respectively. The data in the continuous range above the 2P1/2 threshold are shown as full circles with error bars. The curves below the 2P3/2 and 2P1/2 ionization thresholds are expected to approach the values in the continuum continuously (for details see the discussion and references in the original publication). From [HSS86] the dt given here are larger by /3 in order to adapt them to the cross section...

The position of the maximum of an electron line is the easiest quantity to extract from an experimental spectrum, and maxima of the xenon 4d5/2 photoline and N5-02,302,3 S0 Auger line will be considered first for different photon energies. The results are shown in Fig. 5.26. For photon energies above 100 eV, i.e., for exc > °, the experimental values scatter within their error bars around a mean value. Such constant values are predicted in the retarded PCI model which includes the finite velocity of the Auger electron. Hence, this experimental result was a first... 

Figure 5.32 Angular correlation between 4d5/2 photo- and N5-02> 302f 3 Sq Auger electrons in xenon. A polar plot of the coincident intensity is shown for the following experimental conditions photon energy 94.5 eV, Stokes parameter Sj = 0.957, S2 = 0, S3 unknown both electrons are detected in a plane perpendicular to the incident photon beam, the photoelectron at fixed position (ephe) with 0 = 90°, = 150°, the Auger electron at...

Compton scatter, which makes the largest contribution to attenuation at diagnostically relevant photon energies, is related to the electron density and not to the element number of the atoms under investigation (McCullough 1975). However, the photo effect, which also causes significant attenuation in many atoms, is related to their element number. As evident in Fig. 5.2, high values apply for z-values of 53 (iodine) or 54 (xenon). The elements that make up the human. 

Fig. 4.3. Total photo-absorption cross-section of xenon versus photon energy in the vicinity of the 4d threshold. The solid hne represents TDDFT calculations and the crosses are the experimental results of [43]. Figure adapted from [42]...

Fig. 6 The asymmetry parameters 3 for the 5s shell of xenon as functions of photon energy o). Experiment Dehmer and Dill, Ref. 56 ...

A quite different application of the RRPA equag ons is illustrated in Fig. 7 where we compare experimental and theoretical Beutler-Fano resonances in the xenon photoabsorbtion cross section. These resonances occur for photon energies just above the 5p3/2 threshold and are a result of the coupling between nd and ns states converging to the 5pi/2 threshold and the continuum. Since the RRPA automatically provides for the 5p3/2 Pl/2 threshold separation, and includes couplings between the relevant open and closed channels, it is a theory Ideally suited to study such resonances. The comparison in Fig. 7 illustrates how well the theory works in such applications. 

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