Photon energy dependence

Bailey C G, Dessent C E FI, Johnson M A and Bowen K FI 1996 Vibronic effects in the photon energy-dependent photoelectron spectra of the CFIjCN dipole-bound anion J. Chem. Phys. 104 6976-83... 

Figure 15 illustrates the interplay between the time scales of intermediate state decay, final state decay, and dephasing in determining the photon energy dependence of 8s. The final state in Fig. 15 is chosen to satisfy the resonance condition when the intermediate state is resonantly excited, e/ e,- = 2(er — e,). 

It is interesting to note (see Eqs. (59)—(61)) that pure decoherence introduces dependence of the channel phase on the final state energies. This dependence can be utilized to obtain new insights into the resonance properties, as illustrated in Fig. 16. Here we explore the photon energy dependence of 8/ for final state... 

Fig. 12 Probe photon energy dependence of the time profile for the refiectance change AR/R observed at 180 K and 260 K. The pump photon energy (E//h) was 1.55 eV and the probe photon energy (E//b) was 1.72 and 1.38 eV for the upper and lower panels, respectively. The oscillations in AR/R relate molecular deformation modes [162]...

Recently, a group in the United Kingdom started to study the effect of vacuum UV photons using the Daresbury synchrotron facility. They measured the yields of ssb and dsb in plasmid DNA, and proposed that the mechanism or a precursor to produce both types of strand breaks are common, because the photon energy dependence is similar for both types, although the absolute yield differed by 50-fold [17]. They confirmed that double... 

The Fricke solution contains iron ion in its constituent, and one might expect the effect of inner-shell photoabsorption of iron around the energy region of the Fe K-shell absorption edge. No photon-energy dependence of the Fricke yield around the K-shell absorption edge of the ion was found, which was explained by the small abundance of iron in the sample. 

Figure 2 Photon energy dependence of the yield of ssb (open circle) and dsb (closed circle) per absorbed energy in plasmid DNA irradiated in aqueous solution [44]. The Fricke yield is also shown for comparison (closed triangle).

Data on the photon energy dependence of the biological effect has been accumulated fairly well with strand-break induction in plasmid DNA, and with an inactivation of the spore of a bacterium. These studies gave us many clues to understand the induction mechanism of biological effects in cells. However, for a complete understanding, research in the following areas should be highly promoted. 

Figure 24 Incident photon energy dependence of the surface charge separation efficiency (h" / photon) measured by PITCS. Squares, circles, triangles, and diamonds represent the results obtained for Cr-implanted rutile, Cr-doped rutile, undoped rutile, and anatase Ti02 films, respectively.

There are, however, arguments, which contradict the partial localization interpretation. This interpretation must assume that the 5 f emission at Ep (itinerant state) and at the 2.5 eV satelhte have different photon energy dependence of the cross section at the resonance. As recently discussed this is difficult to explain since both structures are attributed to 5 f states. Furthermore, the main asymmetric 4 f core level should be accompanied by a shake-up satellite, induced by 6d screening of the localized hole, which has never been observed. 

Figure 19. Photon energy dependence of the photoionization cross section intensity of photoelectron peak varies depending upon input photon energy, due to the variation in the deBroglie wavelength of outgoing electron. These wavelengths are compared to the radial wavefunctions of Cu 3d and Cl 3p orbitals. Reproduced from Ref. 28. Copyright 1985, American Chemical Society.

The interaction of a photon with an atom changes the structure of the atom, and the photon-energy-dependent change in the observables is called the dynamics in the photon-atom interaction. Therefore, in the present context of the study of photoionization processes using electron spectrometry and synchrotron radiation, the observations that can be made on the emitted electrons are all studies of dynamical properties. In the light of the foregoing discussion on the forces in the atom and the transition operator it can be concluded that photoprocesses in atoms provide a unique opportunity for fundamental investigations which explore the dynamics of many-body effects, because both the forces and the interaction... 

Table 4 Photon energy dependence of NO and O desorption from Pt(l 1 l)-NO, and CO and CO+ desorption from Pt(l 1 l)-CO.

The emitted photon energy depends on both the relative positions of donor and acceptor levels in respect to the VBs and CBs (ED and EA, respectively) and the spatial separation between the donor and acceptor sites (r) [33],... 

Fig. 2 Photon energy dependence of photoionization cross sections of Fe atomic orbitals...

Nakamura, H. and Yamashita, K. (2005) Electron tunneling of photochemical reactions on metal surfaces nonequilibrium Green s function-density functional theory approach to photon energy dependence of reaction probability. J. Chem. Phys., 122, 194706-1-195706-13. 

The absorption lineshape corresponds to the photon-energy dependence of the rate at which the photon is absorbed by the molecule. We consider absorption under conditions where it is a linear process, that is, where the rate at which the molecular system absorbs energy from the radiation field at frequency co is proportional to the radiation intensity (number of photons) at this frequency. Under such conditions it is enough to consider the rate of absorption from a single photon state and to use the... 

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