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Start Over Author "Petrov I" Journal journal of physics b: atomic, molecular and optical physics
43 results on '"Petrov I"'

22. Photoionization of Ar and Ar-like ions near the 3s-threshold

Author

Lagutin, B M, primary, Demekhin, Ph V, additional, Petrov, I D, additional, Sukhorukov, V L, additional, Lauer, S, additional, Liebel, H, additional, Vollweiler, F, additional, Schmoranzer, H, additional, Wilhelmi, O, additional, Mentzel, G, additional, and Schartner, K-H, additional

Published
1999
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39. Cross sections for photoabsorption and 3p44s,3d satellite production at energies of the doubly excited Ar 3p4(3P)4s2P3/2,1/2np resonances

Author

Kammer, S, Schartner, K-H, Mickat, S, Schill, R, Ehresmann, A, Werner, L, Klumpp, S, Schmoranzer, H, Petrov, I D, Demekhin, Ph V, and Sukhorukov, V L

Abstract

The photoabsorption of Ar is studied experimentally and theoretically for energies between 32.5 eV and 33.0 eV. Resonant excitation and autoionization of doubly excited 3p4(3P)4s2P3/2,1/2np Rydberg states are observed as dominant mechanism to populate doublet and quartet satellites of the 3p44s, 3d configurations. The perturbation of the Rydberg series by promoter states is reproduced by the calculations. Measured and calculated cross sections for the strong decay channels are in good agreement. A mirror behaviour of the 3s vacancy creation and the satellite production and the influence of the radiative decay of high-lying Rydberg states on the shape of a satellite threshold are manifested.

Published
2006
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40. Experimental and theoretical investigation of even mp51/2np' autoionizing resonances of rare gas atoms

Author

Peters, T, Halfmann, T, Even, U, Wünnenberg, A, Petrov, I D, Sukhorukov, V L, and Hotop, H

Abstract

Using experimental set-ups involving single photon excitation of metastable rare gas atoms Rg(mp5(m+ 1)s, J= 2, 0) by a pulsed frequency-doubled dye laser in conjunction with time-of-flight ion detection, we have investigated several even Rg(mp51/2np') autoionizing resonances of the heavier rare gas atoms Rg = Ne ? Xe (m= 2-5) at experimental bandwidths of 0.06 cm?1(Ne) and about 0.25 cm?1(Ar, Kr, Xe). New level energies (quantum defects) and widths for these resonances have been derived by a Fano-type lineshape analysis, thus yielding reduced resonance widths. The experimental spectra and the resonance parameters are compared with theoretical calculations which are based on the configuration interaction Pauli-Fock approach, including core polarization. For Rg = Ne, good agreement between the measured and the calculated results is observed. For the heavier rare gases, significant deviations between some of the existing experimental data and the theoretical results are found, indicating the need for further studies.

Published
2005
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41. Theoretical and experimental study of the extreme ultraviolet photoabsorption spectrum of triply ionized yttrium

Author

Yeates, P, Kennedy, E T, Mosnier, J-P, van Kampen, P, Mansfield, M W D, Pedregosa-Gutierrez, J, Greenwood, J B, Demekhin, Ph V, Petrov, I D, Lagutin, B M, Sukhorukov, V L, Demekhina, L A, and Costello, J T

Abstract

The photoabsorption spectrum of Kr-like Y3+ions in the very soft x-ray/extreme ultraviolet spectral range where single (4s-np) and double (4p4p-nn'') electron excitations dominate has been measured using a dual laser plasma photoabsorption technique. The corresponding photoionization cross section has been computed within the framework of the configuration interaction Pauli-Fock approach. The calculations confirm that the 4s-5p resonance drops below the 4p ionization threshold so that the first member of the 4s-np photoionization resonance series becomes 4s-6p. Also, whereas the first such series member in Rb+and Sr2+appears as a window resonance, in Y3+it switches to a normal, slightly asymmetric absorption peak. In addition, although the 4s-5p1/2resonances in the 4p51/2and 4p53/2continua are mirror images in Rb+and Sr2+and hence cancel each other, they exhibit quite different shapes in Y3+and hence we observe the residual signature of the 4s-6p1/2resonance as a weak partner to the main 4s-6p3/2resonance.

Published
2004
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42. Observation and identification of doubly excited KrI 4s<SUP>2</SUP>4p<SUP>4</SUP>5snℓ Rydberg series

Author

Ehresmann, A, Klumpp, S, Werner, L, Schmoranzer, H, Kammer, S, Mickat, S, Schartner, K H, Petrov, I D, Demekhin, Ph V, and Sukhorukov, V L

Abstract

Dispersed Kr VUV-fluorescence excitation spectra and photoion yields were recorded in the exciting photon energy range between 28.4 eV and 28.7 eV with extremely narrow bandwidth (1.7 meV at 28.55 eV) of the monochromatized synchrotron radiation used as the exciting photon source. Two series of doubly excited KrI states were observed and identified as the 4s24p4 (3P) 5s 4P1/2 np and the 4s24p4(3P)5s 2P3/2 np series.

Published
2004

43. Calculation of Xe<SUP>i+</SUP> photoion yields in coincidence with energy-selected M<SUB>45</SUB>NN Auger electrons

Author

Kochur, A G, Dudenko, A I, and Petrov, I D

Abstract

A theoretical model to calculate the photoion yields registered in coincidence with fixed-energy Auger electrons is developed. The intermediate-coupling approximation is used to calculate the term structure of the two-hole states reached by Auger transitions, and the branching ratios of their further Auger, Coster–Kronig and super Coster–Kronig decays into the three-hole states. The remaining parts of the cascading decay de-excitation trees are simulated in configuration-average approximation for branching ratios and transition energies. Our calculation allowed us to explain the recent M45NN Auger-electron–photoion coincidence experiment upon M45 photoionization of Xe.

Published
2004

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