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  • 1. Baltzer, Peter
    et al.
    Chau, F. T.
    Eland, J. H. D.
    Karlsson, Leif
    Lundqvist, M.
    Rostas, J.
    Tam, K. Y.
    Veenhuizen, Hans
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Wannberg, Björn
    A study of the vibronic structure in the HeI excited photoelectron spectrum of CO2 involving the X 2Pig and A 2Piu ionic states1996In: The Journal of Chemical Physics, ISSN 00219606, Vol. 104, no 22/June 8, p. 8922-8931Article in journal (Refereed)
  • 2. Eriksson, Mattias
    et al.
    Johansson, S
    Wahlgren, G. M.
    Veenhuizen, Hans
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Munari, U
    Siviero, A
    Bowen excitation of NIII lines in symbiotic stars2005In: Astronomy & Astrophysics, Vol. 434, no 05/2005, p. 397-404Article in journal (Refereed)
  • 3.
    Eriksson, Mattias
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Nilsson, Hampus
    Veenhuizen, Hans
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Long, K. S.
    Modeling of C IV pumped fluorescence of Fe II in symbiotic stars2008In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 477, no 1, p. 255-265Article in journal (Refereed)
    Abstract [en]

    Aims. We describe how the C IV lambda 1548.18 line pumps the 1548.20 and 1548.41 angstrom channels of Fe II in symbiotic stars through the process known as photo-ionization by accidental resonance (PAR). We describe where and why Fe II fluorescence arises in symbiotic stars and whether the Fe II lambda 1548.41 channel can only be activated when there is a white-dwarf wind present in the system. Further, we aim to show how an analysis of the PAR-pumped lines helps to understand the phyisical conditions that they manifest. Methods. We calculate intensities of the C IV-pumped Fe II fluorescence lines in symbiotic stars, corresponding to the y(4)H(11/)2 and w(2)D(3/2) levels, based on a simple geometrical model of the emitting regions. We apply the model to seven symbiotic stars, known to have Fe II fluorescence lines pumped by C IV in their spectra. We compare the predicted intensities to the observed intensities of the selected symbiotic stars. Results. We find that we can reproduce the observed fluorescence intensities of the seven symbiotic stars in our sample, using parameters that are consistent with their known properties. We show that PAR-produced lines can be used as a diagnostic tool to derive important physical parameters of a stellar system. We suggest that the detection of Fe II lines corresponding to the w2D3/2 level in certain symbiotic stars provide evidence of hot shells expanding with velocities of at least hundreds km s(-1) in those systems.

  • 4. Eriksson, Mattias
    et al.
    Veenhuizen, Hans
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Nilsson, Hampus
    Fluorescence Fe II lines as traces of fast outflows of white dwarf winds2007In: Baltic Astronomy, ISSN 1392-0049, Vol. 16, no 01, p. 95-97Article in journal (Refereed)
    Abstract [en]

    A set of equations are put into a code forming a procedure to derive intensities of fluorescence lilies based on both physical properties of the fluorescent plasma and its location relative to the origin of the pumping emission. In a first test, the code is applied to symbiotic stars, and effort is made to explain the circumstances under which the two known Fell channels pumped by C IV are activated. For the channel at 1548.204 angstrom, which is most frequently observed to be active, there is a good agreement between the results of the calculations and the observed Fell line strengths. Fluorescence lines resulting from pumping through the other channel at 1548.411 angstrom can occur, according to the results of the calculations, only in the systems where a fast outflow from the white dwarf wind is present. The evidences of the white dwarf winds are found in the literature for all the symbiotic systems in which observation of the Fell fluorescence lines from the w(2)D(3/2) level is reported. 

  • 5. Eriksson, Mattias
    et al.
    Veenhuizen, Hans
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Wahlgren, G. M.
    Johansson, Sveneric
    Fe II fluorescence in symbiotic stars2004In: Revista Mexicana de Astronomia y Astrofisica Conference Series 21 / [ed] Allen C. and Scarfe C., Merida, Yucatan, Mexico, 2004, p. 132-136Conference paper (Refereed)
  • 6. Maripuu, Rein
    et al.
    Reineck, Ingrid
    Ågren, Hans
    Nian-Zu, Wu
    Rong, Ji Ming
    Veenhuizen, Hans
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Al-Shamma, S. H.
    Karlsson, Leif
    Siegbahn, Kai
    The HeI excited electron spectrum of phosphine: AN EXPERIMENTAL AND THEORETICAL-STUDY1983In: Molecular Physics, Vol. 48, no 6, p. 1255-1267Article in journal (Refereed)
  • 7. Reineck, Ingrid
    et al.
    Maripuu, Rein
    Veenhuizen, Hans
    Institute of Physics, University of Uppsala, Box 530, S-751 21 Uppsala Sweden.
    Karlsson, Leif
    Siegbahn, Kai
    Powar, M. S.
    Nian Zu, Wu
    Ming Rong, Ji
    Al-Shamma, S. H.
    Vibrational structure in the valence electron spectra of pyridine and pyridine-d51982In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 27, no 1, p. 15-27Article in journal (Refereed)
  • 8. Reineck, Ingrid
    et al.
    Nohre, C.
    Maripuu, Rein
    Lodin, P.
    Veenhuizen, Hans
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Al-Shamma, S. H.
    Karlsson, Leif
    Siegbahn, Kai
    High-resolution UV photoelectron spectrum of CO21983In: Chemical Physics, Vol. 78, no 3, p. 311-318Article in journal (Refereed)
    Abstract [en]

    The highly-resolved HeI photoelectron spectrum of CO2 is presented and its vibrational structure studied in detail. In the 2Πg ionic state the v3 antisymmetric mode is found to be excited in double quanta (v1- v2- v3 = 0. 0. 2) with energy hv3 = 181 meV. In the 2Σg+ state a single quantum of the same mode is found to be excited (hv3 = 189 meV) in combination with a v1 excitation. Vibronic interaction with vibrational levels in the 2Σu+ state of the ion is suggested to promote this (1, 0, 1) excitation. It is established that inelastic scattering processes contribute to the vibrational structure in the 2Σg+ band. The spin-orbit splitting in the 2Πg is determined to be 19±1 meV and 10±2 eV in the 2Πu state. Vibronic structure is resolved in the 2Πg band where the Renner-Teller coupling constant is determined to be ε = 0.21±0.02 and the vibrational energy of the v2 mode as 60±7 meV. In the 2Πu state the v2 energy is found to be hv2 = 60 meV from the observed hot-band structure. 

  • 9. Reineck, Ingrid
    et al.
    Wannberg, Björn
    Veenhuizen, Hans
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Nohre, C.
    Maripuu, Rein
    Norell, Karl Erik
    Mattsson, Lars
    Karlsson, Leif
    Siegbahn, Kai
    Inelastic scattering and satellite fine structure in the high-resolution uv photoelectron spectrum of CS21984In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 34, no 3, p. 235-252Article in journal (Refereed)
    Abstract [en]

    The outer valence region in CS2 has been studied by high-resolution UV photpelectron Spectroscopy. The spectra reveal detailed vibrational structure in the X 2Πg, A 2Πu, B 2Σ+u and C 2Σ+g bands. Some of the fine-structure peaks in the X B and C bands are shown to be pressure-dependent. The reason for the pressure dependence is assumed to be inelastic scattering of electrons emitted in the adiabatic transitions. It is established that the two CI satellite bands present in the He(I)-excited spectrum contain vibrational structure. 

  • 10.
    Veenhuizen, Hans
    Uppsala University, Department of Physics.
    High resolution and angle-resolved UV photoelectron spectroscopy applied to free molecules1984Doctoral thesis, monograph (Other academic)
  • 11.
    Veenhuizen, Hans
    Uppsala University, Department of Physics.
    High resolution and angle-resolved UV photoelectron spectroscopy applied to free molecules1984Doctoral thesis, monograph (Other academic)
  • 12.
    Veenhuizen, Hans
    et al.
    Department of Physics, University of Uppsala.
    Wannberg, Björn
    Mattsson, Lars
    Norell, Karl Erik
    Karlsson, Leif
    Siegbahn, Kai
    Acquisition and processing of angle-resolved photoelectron spectra excited with focussed polarized resonance radiation1986In: Journal of Electron Spectroscopy and Related Phenomena, ISSN 0368-2048, E-ISSN 1873-2526, Vol. 41, no 2, p. 187-203Article in journal (Refereed)
    Abstract [en]

    A system for the acquisition of angle-resolved photoelectron spectra is described. The sample gas is excited by VUV resonance radiation, which is polarized to about 95% using a fully rotatable fourfold reflection polarizer. One of the mirrors is toroidally shaped in order to focus the radiation into the sample gas cell. This design gives count rates comparable to those obtained by an unpolarized source, and at a greatly reduced background level. A computer controlled system has been developed to automate the recording procedure. It allows for simultaneous recordings of the spectra at the different angular settings, thus eliminating the effects of intensity drifts. Details of calibration procedures and data processing, including spectrum analysis, are given along with a discussion of the accuracy of the results. To illustrate the performance, measured β-values for the main components of the four outermost photoelectron bands in the Hel excited spectrum of CO2 are presented. 

  • 13.
    Veenhuizen, Hans
    et al.
    Department of Physics, University of Uppsala.
    Wannberg, Björn
    Mattsson, Lars
    Norell, Karl Erik
    Nohre, C.
    Karlsson, Leif
    Siegbahn, Kai
    High resolution angle-resolved photoelectron spectrum of CO2, excited with polarized resonance radiation1986In: Journal of Electron Spectroscopy and Related Phenomena, ISSN 0368-2048, E-ISSN 1873-2526, Vol. 41, no 2, p. 205-223Article in journal (Refereed)
    Abstract [en]

    The He(I) excited and angle-resolved photoelectron spectrum of CO2 is investigated using a focussing VUV-polarizer. High resolution combined with the additional information given by comparing spectra taken at different angles permits detailed analysis of the vibrational structure. β-values are given for all vibrational components hitherto observed in the photoelectron spectrum of the ≈X, ≈A,≈B and ≈C electronic bands. Single excitations of the v3 mode with vibrational energies 181 meV in the estate and 279 meV in the ≈B-state are reported. The peak at 360 meV vibrational energy in the (≈C-state is reinterpreted as a single v3 excitation. The β-values of the most intense peaks are also measured using Ne(I) (16.67 and 16.85 eV), Ne(II) (26.86 and 26.95 eV) and He(II) (40.81) resonance radiations. 

  • 14. Wannberg, Björn
    et al.
    Veenhuizen, Hans
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Mattsson, Lars
    Norell, Karl Erik
    Karlsson, Leif
    Siegbahn, Kai
    High-resolution angle-resolved photoelectron spectrum of the B 2sigmau+ state in CO2+1984In: Journal of Physics B, Vol. 17, no 8, p. L259-L264Article in journal (Refereed)
  • 15. Wannberg, Björn
    et al.
    Veenhuizen, Hans
    Department of Physics, University of Uppsala.
    Norell, Karl Erik
    Karlsson, Leif
    Mattsson, Lars
    Siegbahn, Kai
    Angular distribution of photoelectrons from p levels in Ar, Kr and Xe close to threshold1986In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 19, no 15, p. 2267-2277Article in journal (Refereed)
    Abstract [en]

    Using a DC discharge VUV source equipped with a rotating, focusing reflection polariser in conjunction with a hemispherical electron spectrometer, the angular distribution of photoelectrons from the outermost p levels in the noble gases Ar, Kr and Xe was measured in the kinetic-energy region 0-3 eV. Discharges in Ne, Ar, Kr, Xe and N2 are used to obtain photons with energies in the range 11-19 eV. For photon energies between the ionisation thresholds for the P3/2 and P1/2 levels, observed rapid oscillations in beta are correlated with resonances with autoionising states. For higher photon energies, the energy dependence of beta is smooth. 

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