TheK Auger spectrum of the free magnesium atom

TheK Auger spectrum of free Mg atoms has been investigated with an electrostatic energy analyzer at an energy resolution of 0.16%. The ionization in theK shell of the Mg vapour was caused by electron impact. Absolute energies and relative intensities of the normal Auger transitionsK-LL and of the most intense satellite lines have been determined. The experimental energies and relative group intensities of the normal lines agree well with theoretical values. The total intensity of special classes of satellites are compatible with calculations of the shake theory within the sudden approximation.     

Beam-foil-excited Auger transitions in neon

Energy spectra of electrons ejected from collisions between a carbon foil and Ne projectiles with energies between 1.4 and 20 MeV have been measured. Continuous and discrete electron energy distributions are observed. Auger transitions of foil-excited Ne have been studied. Using relativistic Dirac-Fock multiconfiguration calculations, most of the measured Auger transitions have been identified.     

Fried-Martin corrections for mesonic Auger transitions

Using excited circular orbits of απ^?e^?, αK^?e^? and α$\text{p}$e^? atoms as examples, it is shown that nuclear motion corrections to computed Auger rates can depend sensitively on the interpretation of the wave functions actually employed and also on the multipole order of the transition.     

The valence band of free K clusters studied by photoelectron and Auger spectroscopies

The valence states of free neutral potassium clusters produced by a gas aggregation source were probed by synchrotron radiation based photoelectron spectroscopy. The first ionization energy (IE) of the clusters was determined to be 10% larger than the work function of bulk potassium. Using electrostatic concepts and the IE, the mean size of the clusters was estimated to be ≈2000 atoms. Further information about the valence band was provided by investigation of the Auger process initiated by the ionization of the 3p level with a subsequent emission of an Auger electron from the valence band (M_2,3VV). Plasmon satellites were observed in Auger spectra of free metal clusters.     

Interatomic Auger transitions: A survey

A brief survey of the effects of interatomic Auger and Coster-Kronig transitions involving either the annihilation and/or ejection of electrons associated with the ligands nearest neighbor to the hole-state atom is presented. It is shown by way of example how these transitions may be used to interpret low energy Auger spectra of compound materials. Since these transitions affect the lifetime of certain core hole states, their probability should be reflected in their linewidths measured by x-ray photoelectron and x-ray emission spectroscopies. Dominant nonlifetime broadening processes generally preclude accurate determination of lifetime effects for most compounds u sing the former technique, but the latter spectroscopy may prove useful for studying such effects from the linewidths of characteristic x-rays and the intensities of multiple-hole x-ray satellite lines in certain materials.     

Auger transitions in Li-like and Be-like ions

Measurements of the Auger decay of beam-foil excited Be II and Be I levels are reported along with a proposed assignment of the experimental spectra. The Li I, Be II and Be III (1s2s²)²S → (1s²2s)²S Auger transitions as presented in this letter represents the first observation of such states in positive ions with Z?5.     

Energies of metastable K-LL Auger transitions in neon

The parameters of the analytic radial Orbitals are determined for Ne³⁺, Ne⁴⁺, Ne⁵⁺, Ne⁶⁺, and Ne⁷⁺ with K vacancies. The energies of K-LL Auger transitions that do not satisfy the selection rules L=S= (parity)=0 are obtained in Ne⁺-Ne⁷⁺.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 68–72, July, 1978.     

Analysis of the angular distribution of Auger electrons in a Xe atom

The angular distribution of Auger electrons, and the numerically calculated anisotropy parameters of the angular distribution α for (M₃ → N₂N₃), (M₃ → N₃N₃), (M₄ → N₁N₃), (M₄ → N₄N₅), (M₄ → N₅N₅), and (M_4,5 → O_{2, 3}O_{2, 3}) transitions in a Xe atom are given. The matrix elements are calculated by using the nonrelativistic Hartree-Fock method in LS coupling and the relativistic Hartree-Fock-Dirac method in both jj coupling (the single-configuration approximation) and intermediate coupling (the multiconfiguration approximation).     

Bremsstrahlung-induced Auger transitions and photoemission in elemental red phosphorus

Measurements of the Bremsstrahlung-inducedK-LL andK-LM Auger transitions in red phosphorus are reported and compared with semi-empirical data. The relative intensities of theK-LL lines are in excellent agreement with predictions based on the intermediate coupling scheme including configuration interaction. There is, however, a disagreement between the predicted and the experimental values of the kinetic energies. The origin of this discrepancy is due to inaccurate binding energy values used in earlier semiempirical estimations. Revised semi-empirical energy values based on reliable binding energies determined by internal and conventional x-ray photoemission are in excellent agreement with the experimental data. The energy of the x-rayK radiation is 2,013.8±0.4 eV, the Wagner's Auger parameter amounts to 1,987.2±0.1 eV in elemental red phosphorus, and to 1,983.9±0.5 eV in phosphorous oxide.     

Auger transitions in narrow-gap semiconductors with lax band structure

Auger recombination and ionisation rates are calculated in narrow-gap semiconductor with Lax band structure⁸ such as Pb_1?xSn_xTe, Pb_1?xSn_xSe, Bi_1?xSb_x. Both low-energy (T_e? ε_g) and high-energy (ε_F ? ε_g or Te ? ε) regions are taken into consideration. In the former case we have corrected the results obtained by number of authors^3,4. The latter situation may take place in pinch channel or at the high level of laser exitation. Here we have derived the results except for constant numerical coefficient. We consider the two-particle Auger-process proposed by Emtage³ as well as three-particle ones including additional collision with acoustical phonon, charged impurity or neutral defect. The dependence of Auger transition rates upon the carrier concentration is mainly of the power-type in all variants.     

The tungsten Auger transitions : 150–200 eV

The low-energy Auger spectrum of tungsten, induced by electron bombardment, has been studied. The second-derivative detection mode was employed to improve the resolution of fine structure. A comparison of N(E) spectra and yield curves with theoretical Auger rates and line energies showed that N_4,5N_6,7X processes dominate the spectrum, where X denotes N_6,7 or O_2,3. The core—core—valence (X = O_4,5) processes occur with low probability. The N₄N₅V transition appears to be energetically allowed in tungsten, and to occur at a sufficiently high rate to alter the initial N₅ : N₄ hole-states ratio for the above Coster—Kronig and super-Coster—Kronig processes. For primary excitation energies above 425 eV, there is also a small contribution (about 12% at maximum) from N₃N₅V processes, which occurs around 166 eV.     

Distinction between weak Auger transitions and internal X-ray photoemission

Estimates of the relative intensities of KLV Auger electrons and internally excited photoelectrons of similar energy show that the Auger process will dominate contrary to a recent suggestion by Powell.     

Lineshapes of Cd Auger MNV transitions in the metal and in CdO

The MNV Auger lineshapes are presented for Cd and for CdO and are discussed in terms of the band-like vs atomic-like picture: the Auger line-shape for CdO is compared with photoemission results. It is shown that the Auger MNV transitions are band-like in the metal, while the hole—hole interaction in the final state has a considerable importance in the oxide.     

Radiative and Auger transitions of core-excited states for the boron isoelectronic sequence

We introduce an approach for the characterization of quantum correlations in two-fermion systems based upon the state disturbances generated by the measurement of “local” observables (that is, quantum observables represented by one-body operators). This approach leads to a concept of quantum correlations in systems of identical fermions different from entanglement.     

Acceleration mechanism of atom clusters during radiationless transitions

We describe the mechanism of energy transition from an electron to an atom cluster during nonradiative electron relaxation. An assessment of this process is given, and it is shown that it could play an important role in accelerating the rebuilding of the atomic structure in amorphous alloys upon crystallization, chemical reactions in a condensed medium, and other processes associated with the rebuilding of atomic structures subjected to irradiation by light quanta.