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498 results on '"Aksela, H."'

124. Theory and ab initio calculations of 2p photoabsorption spectra: The lowest Rydberg resonances in HCl

Author

Fink, RF, Kivilompolo, M, Aksela, H, Fink, RF, Kivilompolo, M, and Aksela, H

Abstract

We present a theory for 2p core excitation spectra of linear molecules that explicitly includes the spin-orbit splitting of the 2p core orbitals as well as all nonrelativistic effects. This is applied to the absorption spectrum of HCl at the 2p --> 6 sigm, Addresses: Fink RF, Univ Uppsala, Dept Phys, Box 530, S-75121 Uppsala, Sweden. Ruhr Univ Bochum, D-44780 Bochum, Germany. Univ Oulu, Dept Phys Sci, FIN-90401 Oulu, Finland.

Published
1999

129. The character of the Xe 4p -> nl resonances studied with the aid of their Auger decay

Author

Aksela, H, Huttula, SM, Jurvansuu, M, Mursu, J, Kivilompolo, M, Kivimaki, A, Aksela, S, Svensson, S, Aksela, H, Huttula, SM, Jurvansuu, M, Mursu, J, Kivilompolo, M, Kivimaki, A, Aksela, S, and Svensson, S

Abstract

Theoretical predictions for the Xe 4p --> nl photoexcitation are shown to depend strongly on the gauge and wavefunctions used in calculations. In order to test the theory, the resonant Auger decay of the Xe 4p(-1)nl states has been measured with high phot, Addresses: Aksela H, Univ Oulu, Dept Phys Sci, FIN-90570 Oulu, Finland. Univ Oulu, Dept Phys Sci, FIN-90570 Oulu, Finland. Univ Uppsala, Dept Phys, S-75121 Uppsala, Sweden.

Published
1998

132. FINEST: a high performance branch-line for VUV photon energy range gas phase studies at MAX-lab.

Author

Urpelainen, S., Huttula, M., Balasubramanian, T., Sankari, R., Kovala, P., Kukk, E., Nõmmiste, E., Aksela, S., Nyholm, R., and Aksela, H.

Subjects
LIGHT, VACUUM, ELECTRON beams, OPTICS, PHYSICS
Abstract

We present a dedicated beamline branch for high flux and ultra-high resolution (R>100000) gas and vapor phase studies in the vacuum-ultra-violet (VUV) region of light on the undulator beamline I3, located on the 700 MeV MAX-III storage ring. The mechanical and optical design of the branch-line, the differential pumping setup as well as performance characteristics are presented. [ABSTRACT FROM AUTHOR]

Published
2010
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136. Fast dissociation of resonantly core excited H2S studied by vibrational and temporal analysis of the Auger spectra

Author

deBrito, AN, Bjorneholm, O, Neto, JS, Machado, AB, Svensson, S, Ausmees, A, Osborne, SJ, Saethre, LJ, Aksela, H, Sairanen, OP, Kivimaki, A, Nommiste, E, Aksela, S, deBrito, AN, Bjorneholm, O, Neto, JS, Machado, AB, Svensson, S, Ausmees, A, Osborne, SJ, Saethre, LJ, Aksela, H, Sairanen, OP, Kivimaki, A, Nommiste, E, and Aksela, S

Abstract

Excitation of a core electron to the lowest unoccupied orbital of H2S has been shown to give rise to dissociation that occurs faster than the Auger decay. Recent experimental data have allowed us to resolve vibrational structures connected with the resona, Addresses: deBrito AN, UPPSALA UNIV, DEPT PHYS, BOX 530, S-75221 UPPSALA, SWEDEN. UNIV BRASILIA, DEPT PHYS, BR-70910900 BRASILIA, DF, BRAZIL. UNIV BERGEN, DEPT CHEM, N-5007 BERGEN, NORWAY. UNIV OULU, DEPT PHYS SCI, FIN-90570 OULU, FINLAND.

Published
1997

137. Auger decay of the molecular field split S 2p core excited states in HS radical

Author

deBrito, AN, Svensson, S, Osborne, SJ, Ausmees, A, Kivimaki, A, Sairanen, OP, Nommiste, E, Aksela, H, Saethre, LJ, deBrito, AN, Svensson, S, Osborne, SJ, Ausmees, A, Kivimaki, A, Sairanen, OP, Nommiste, E, Aksela, H, and Saethre, LJ

Abstract

Using synchrotron radiation, very high resolution electron spectra at the 2p --> 6a(1) and 2p --> 3b(2) resonances of H2S have been recorded. Auger transitions from molecular field split S 2p hole states of HS* fragment, created by fast dissociation of th, Addresses: LUND UNIV, MAX LAB, FINNISH SYNCHROTRON RADIAT FACIL, S-22100 LUND, SWEDEN. UNIV UPPSALA, DEPT PHYS, S-75121 UPPSALA, SWEDEN. UNIV BERGEN, DEPT CHEM, N-5007 BERGEN, NORWAY. ESTONIAN ACAD SCI, INST PHYS, EE-2400 TARTU, ESTONIA.

Published
1997

142. Decay of the 2p(5)4s, 2p(5)3d and 2p(5)4d states of Ar studied by utilizing the Auger resonant Raman effect

Author

Mursu, J, Aksela, H, Sairanen, OP, Kivimaki, A, Nommiste, E, Ausmees, A, Svensson, S, Aksela, S, Mursu, J, Aksela, H, Sairanen, OP, Kivimaki, A, Nommiste, E, Ausmees, A, Svensson, S, and Aksela, S

Abstract

The 2p electrons of Ar have been excited selectively to the 4s, 3d and 4d orbitals and high-resolution de-excitation spectra have been recorded by utilizing the Auger resonant Raman effect. Fine structures in the resonant Anger spectra have been clearly r, Addresses: Mursu J, UNIV OULU, DEPT PHYS, FIN-90570 OULU, FINLAND. MAX LAB, FINNISH SYNCHROTRON RADIAT FACIL, S-22100 LUND, SWEDEN. UNIV UPPSALA, DEPT PHYS, S-75121 UPPSALA, SWEDEN.

Published
1996

143. Theory of Auger spectra for molecular-field-split core levels

Author

Gelmukhanov, F, Agren, H, Svensson, S, Aksela, H, Aksela, S, Gelmukhanov, F, Agren, H, Svensson, S, Aksela, H, and Aksela, S

Abstract

A theory for nonradiative decay of molecular-held-split states is presented. It is shown that the relative inner-shell sublevel cross sections for Auger transitions are sensitively dependent on the matching of spin-orbit and molecular-field interactions., Addresses: Gelmukhanov F, LINKOPING UNIV, DEPT PHYS & MEASUREMENT TECHNOL, S-58183 LINKOPING, SWEDEN. UNIV UPPSALA, INST PHYS, S-75121 UPPSALA, SWEDEN. UNIV OULU, DEPT NAT SCI, SF-90570 OULU, FINLAND.

Published
1996

144. Auger decay of the dissociating core-excited states in the HCl and DCl molecules

Author

Kukk, E, Aksela, H, Sairanen, OP, Aksela, S, Kivimaki, A, Nommiste, E, Ausmees, A, Kikas, A, Osborne, SJ, Svensson, S, Kukk, E, Aksela, H, Sairanen, OP, Aksela, S, Kivimaki, A, Nommiste, E, Ausmees, A, Kikas, A, Osborne, SJ, and Svensson, S

Abstract

High-resolution Auger electron spectra from the decay of the Cl 2p-->sigma* excitation in HCl and DCl have been measured. The spectra are analyzed, separating molecular and atomic features, which are assigned to transitions to the HCl (5 sigma 2 pi)(4) si, Addresses: Kukk E, UNIV OULU, DEPT PHYS SCI, SF-90570 OULU, FINLAND. UNIV UPPSALA, DEPT PHYS, S-75121 UPPSALA, SWEDEN. ESTONIAN ACAD SCI, INST PHYS, TARTU 2400, ESTONIA.

Published
1996

145. Raman versus non-Raman behavior in resonant auger spectra of HCl

Author

Kukk, E, Aksela, H, Aksela, S, Gelmukhanov, F, Agren, H, Svensson, S, Kukk, E, Aksela, H, Aksela, S, Gelmukhanov, F, Agren, H, and Svensson, S

Abstract

Two different types of Anger processes are shown to constitute the resonant Anger spectra of HCl: one which does and one which does not show Raman narrowing with the decrease of the spectral width of the exciting radiation. An analytical explanation for t, Addresses: Kukk E, UNIV OULU, DEPT PHYS SCI, SF-90570 OULU, FINLAND. LINKOPING UNIV, INST PHYS & MEASUREMENT TECHNOL, S-58183 LINKOPING, SWEDEN. UNIV UPPSALA, DEPT PHYS, S-75121 UPPSALA, SWEDEN.

Published
1996

146. Angular anisotropy of the Kr 3d(3/2,5/2)(-1)5p->4p(-2)5p resonant Auger decay studied by utilizing the auger resonant Raman effect

Author

Aksela, H, Jauhiainen, J, Nommiste, E, Aksela, S, Sundin, S, Ausmees, A, Svensson, S, Aksela, H, Jauhiainen, J, Nommiste, E, Aksela, S, Sundin, S, Ausmees, A, and Svensson, S

Abstract

The anisotropy of the resonant Auger decay of the photoexcited Kr 3d(3/2,5/2)(-1)5p states has been studied by comparing the new high-resolution experimental results with the multiconfiguration Dirac-Fock calculations. The measurements were made with very, Addresses: Aksela H, UNIV OULU, DEPT PHYS SCI, FIN-90570 OULU, FINLAND. UNIV UPPSALA, DEPT PHYS, S-75125 UPPSALA, SWEDEN.

Published
1996

147. Core-to-Rydberg excitations and their Auger decay in the HCl and DCl molecules

Author

Kukk, E, Aksela, H, Sairanen, OP, Nommiste, E, Aksela, S, Osborne, SJ, Ausmees, A, Svensson, S, Kukk, E, Aksela, H, Sairanen, OP, Nommiste, E, Aksela, S, Osborne, SJ, Ausmees, A, and Svensson, S

Abstract

The resonant Anger electron spectra of the HCl and DCl molecules have been measured at the first core-to-Rydberg resonances. The low binding energy region of the spectra has been decomposed into transitions to different bound states and their vibrational, Addresses: Kukk E, UNIV OULU, DEPT PHYS SCI, FIN-90570 OULU, FINLAND. UNIV UPPSALA, DEPT PHYS, S-75121 UPPSALA, SWEDEN.

Published
1996

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