Change search
Refine search result
1 - 11 of 11
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Alvarez Ruiz, Jesus
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Atomic and Molecular Physics.
    Melero-Garcia, Emilio
    KTH, School of Engineering Sciences (SCI), Physics, Atomic and Molecular Physics.
    Kivimäki, Antti
    Coreno, M.
    Erman, Peter
    KTH, School of Engineering Sciences (SCI), Physics.
    Rachlew, Elisabeth
    KTH, School of Engineering Sciences (SCI), Physics.
    Richter, R.
    Synchrotron radiation induced fluorescence spectroscopy of SF62005In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 38, p. 387-Article in journal (Refereed)
    Abstract [en]

    The fluorescence of gaseous SF6 was investigated after excitation with 25-80eV synchrotron radiation photons. The total UV-Vis-near IR fluorescence yield was recorded and interpreted in terms of inner valence excitations/ionizations and double excitations in SF6. Dispersed fluorescence measurements in the 400-1000 nm spectral range reveal excited S, S+, F and F+ fragments as solely responsible for the emission. The fluorescence intensity of some of the observed atomic transitions was monitored as a function of the excitation energy. Single, double and triple excitations as well as direct ionizations and shake-ups are proposed as the triggering processes responsible for the creation of the emitting fragments.

  • 2.
    García, Emilio Melero
    et al.
    KTH, Superseded Departments, Physics.
    Álvarez Ruiz, Jesús
    KTH, Superseded Departments, Physics.
    Erman, Peter
    KTH, Superseded Departments, Physics.
    Kivimäki, Antti Eerik
    KTH, Superseded Departments, Physics.
    Rachlew-Källne, Elisabeth
    KTH, Superseded Departments, Physics.
    Rius Riu, Jaume
    KTH, Superseded Departments, Physics.
    Stankiewicz, Marek
    KTH, Superseded Departments, Physics.
    Veseth, V.
    Neutral dissociation of superexcited states in nitric oxide2003In: Chemical Physics, ISSN 0301-0104, E-ISSN 1873-4421, Vol. 293, no 1, p. 65-73Article in journal (Refereed)
    Abstract [en]

    Near-infrared dispersed fluorescence measurements of 13 different atomic multiplets of neutral atomic fragments from photon induced neutral dissociation processes in NO are reported. For excitation of the molecules narrow band synchrotron photons of energy 17.2-25.8 eV were used. Neither Rydberg series nor other molecular states in NO known so far can account for the collected data. From ab initio calculations we try to obtain more information regarding the NO precursor states, and the mechanism behind the observed neutral dissociation.

  • 3.
    Kivimäki, Antti
    et al.
    KTH, Superseded Departments, Physics.
    Alvarez Ruiz, Jesus
    KTH, Superseded Departments, Physics.
    Erman, Peter
    KTH, Superseded Departments, Physics.
    Hatherly, Paul
    Melero Garcia, Emilio
    KTH, Superseded Departments, Physics.
    Rachlew, Elisabeth
    KTH, Superseded Departments, Physics.
    Rius i Riu, Jaume
    KTH, Superseded Departments, Physics.
    Stankiewicz, Marek
    An energy resolved electron-ion coincidence study near the S 2p thresholds of the SF6 molecule2003In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 36, no 4, p. 781-791Article in journal (Refereed)
    Abstract [en]

    The fragmentation dynamics of the SF6 molecule following the excitations of S 2p electrons into unoccupied molecular orbitals has been studied using the energy-resolved electron-ion coincidence technique. Fragmentation patterns were found to depend on the particular excitation and on the electronic state of the molecular ion. The spectator resonant Auger decay at the 2p --> 6a(1g) resonance induces changes in the ion distributions as compared to direct photoionization. Furthermore, coincidence spectra related to the same Auger structure display different ion abundances at the 2t(2g) and 4e(g) shape resonances. Differences were also found in the Auger decay spectra. These findings give further support for the previously suggested many-electron character of the 4e(g) shape resonance.

  • 4.
    Melero Garcia, Emilio
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Atomic and Molecular Physics.
    Alvarez Ruiz, Jesus
    KTH, School of Engineering Sciences (SCI), Physics, Atomic and Molecular Physics.
    Menmuir, Sheena
    KTH, School of Engineering Sciences (SCI), Physics.
    Rachlew, Elisabet
    KTH, School of Engineering Sciences (SCI), Physics.
    Erman, Peter
    KTH, School of Engineering Sciences (SCI), Physics, Atomic and Molecular Physics.
    Kivimäki et al., Antti
    Fluorescence study of doubly excited states of molecular hydrogen2006In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 39, no 2, p. 205-213Article in journal (Refereed)
    Abstract [en]

    Photodissociation of molecular hydrogen has been investigated by means of fluorescence spectroscopy using synchrotron radiation. Balmer-alpha emission from atomic hydrogen photofragments was collected in the 20-55 eV excitation energy range. Experimental data are interpreted in terms of excitation and fragmentation of neutral doubly excited states and excited ionic states with the aid of recent theoretical model calculation.

  • 5.
    Rius Riu, Jaime
    et al.
    KTH, Superseded Departments, Physics.
    Melero Garcia, Emilio
    KTH, Superseded Departments, Physics.
    Alvarez Ruiz, Jesus
    KTH, Superseded Departments, Physics.
    Erman, Peter
    KTH, Superseded Departments, Physics.
    Hatherly, Paul
    Rachlew, Elisabeth
    KTH, Superseded Departments, Physics.
    Stankiewicz, Marek
    KTH, Superseded Departments, Physics.
    Core-excitation-induced dissociation in CD4 after participator Auger decay2003In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 68, no 2Article in journal (Refereed)
    Abstract [en]

    The fragmentation of the CD4 molecule after selective ionization of the 1t(2) and 2a(1) electrons with photons from 70 to 290 eV has been studied with the energy-resolved electron-ion coincidence technique. The mass spectra acquired in coincidence with 1t(2) electrons reveal CD4+, CD3+, and CD2+ fragments, depending on the excitation energy used. The production of CD3+ is strongly enhanced after C 1s excitation to different core excited states, with respect to the production observed after direct ionization of the 1t(2) orbital. This enhancement is correlated with the changes of the molecular geometry when it relaxes from the core-excited state.

  • 6. Ruiz, J. M.
    et al.
    Erman, Peter
    KTH, Superseded Departments, Physics.
    Kivimäki, Antti
    KTH, Superseded Departments, Physics.
    Garcia, E. M.
    Rachlew, Elisabeth
    KTH, Superseded Departments, Physics.
    Stankiewicz, M.
    Selective excitation of the np sigma(1)Sigma(+)(u) and np pi(1)Pi(u) to E,F (1)Sigma(+)(g) emission systems in molecular hydrogen using synchrotron radiation2004In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 388, no 03-jan, p. 31-35Article in journal (Refereed)
    Abstract [en]

    The npsigma(1)Sigma(u)(+) and nppi(1)Pi(u) states in H-2 have been selectively excited using monoenergetic synchrotron light in the range 14.4-15.5 eV and the subsequent emission was observed using a grating spectrometer. In total 22 well separated bands of the npsigma(1)Sigma(u)(divided by) and nppi(1)Pi(u) to E,F (1)Sigma(g)(divided by) systems (n = 3-7) were observed and rotationally analysed. The intensities of the P and R branches relative to the Q branch vary strongly in the nppi to EF bands confirming the existence of predissociations of a large number of nppi(1)Pi(divided by) levels. Energy levels of the E,F (1) Sigma(g)(divided by) state (v(EF) = 0, 1, 3, 6-10) are obtained which confirm earlier determinations from other H-2 experiments.

  • 7. Stankiewicz, M.
    et al.
    Riu, Jaume Rius I.
    KTH, Superseded Departments, Physics.
    Ruiz, J. Alvarez
    KTH, Superseded Departments, Physics.
    Erman, Peter
    KTH, Superseded Departments, Physics.
    Hatherly, P.
    Kivimaki, Antti
    KTH, Superseded Departments, Physics.
    Garcia, E. Melero
    KTH, Superseded Departments, Physics.
    Rachlew, Elisabeth
    KTH, Superseded Departments, Physics.
    Relaxation dynamics of SF6 studied by energy-resolved electron ion coincidence technique2004In: Journal of Electron Spectroscopy and Related Phenomena, ISSN 0368-2048, E-ISSN 1873-2526, Vol. 137-40, p. 369-375Article in journal (Refereed)
    Abstract [en]

    The mass spectra from the SF6 molecule acquired by energy-resolved electron ion coincidence (EREICO) technique using (1t(1g) + [5t(1u),1t(2u)]), (3e(g) + 1t(2g)), 4t(1u), and 5a(1g) electrons after both valence and S 2p(-1) 6a(1g) core excitation reveal a strong selectivity in the dissociation from these states. From the comparison of the obtained spectra, the influence of the core-excited state in the relaxation pathway of the molecule is studied. The S 2p --> 6a(1g) core excitation does not affect the relaxation dynamics after participator Auger decay to the (1t(1g) + [5t(1u),1t(2u)])(-1) and (4t(1u))(-l) states, but it alters the relaxation dynamics after participator Auger decay to the (3e(g) + 1t(2g))(-1) and (5a(1g))(-1) states with respect to the decay processes after direct excitation of the same orbitals. These observations point to core excitation induced dissociation in the SF6 molecule.

  • 8. Stankiewicz, Marek
    et al.
    Melero García, Emilio
    KTH, Superseded Departments, Physics.
    Álvarez Ruiz, Jesus
    KTH, Superseded Departments, Physics.
    Eman, Peter
    KTH, Superseded Departments, Physics.
    Hathery, Paul
    Kivimäki, Antti
    KTH, Superseded Departments, Physics.
    Rachlew, Elisabeth
    KTH, Superseded Departments, Physics.
    Rius i Riu, Jaume
    KTH, Superseded Departments, Physics.
    Experimental station for gas phase fluorescence spectroscopy2004In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 75, no 7, p. 2402-2408Article in journal (Refereed)
    Abstract [en]

    The details of an experimental setup for gas phase atomic and molecular fluorescence measurements using synchrotron radiation are described in this article. The most significant part of the apparatus is an optical arrangement, which allows for simultaneous measurements of dispersed as well as total fluorescence intensity using an effusive gas jet and an inbuilt gas cell assembled in a convenient plug and measure configuration. The first measurements concerning fluorescence of the N-2 molecule around the N 1s edge obtained with this setup are presented.

  • 9.
    Vall-llosera, Gemma
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Atomic and Molecular Physics.
    Coreno, Marcello
    CNR-IMIP, Montelibretti.
    Erman, Peter
    KTH, School of Engineering Sciences (SCI), Physics, Atomic and Molecular Physics.
    Huels, Michael A.
    Ion Reaction Laboratory, Department of Nuclear Medicine and Radiobiology, Faculty of Medicine and Health Sciences, Sherbrooke, Que. .
    Jakubowska, Katarzyna
    KTH, School of Engineering Sciences (SCI), Physics, Atomic and Molecular Physics.
    Kivimäki, Antti
    CNR-INFM, TASC Laboratory.
    Rachlew, Elisabeth
    KTH, School of Engineering Sciences (SCI), Physics, Atomic and Molecular Physics.
    Stankiewicz, Marek
    Instytut Fizyki im. Mariana Smoluchowskiego, Uniwersytet Jagielloński.
    VUV photoionisation of free azabenzenes: pyridine, pyrazine, pyrimidine, pyridazine and s-triazine2008In: International Journal of Mass Spectrometry, ISSN 1387-3806, E-ISSN 1873-2798, Vol. 275, no 1-3, p. 55-63Article in journal (Refereed)
    Abstract [en]

    Photoionisation Mass spectrometry was used to obtain the fragmentation pathways of pyridine, pyridazine, pyrimidine, pyrazine and s-triazine molecules upon absorption of 23.0, 15.7 and 13.8eV synchrotron photons. The ionic fragments observed vary from molecule to molecule, however C2H2+, HCN+ and HCNH+ are common to all five molecules at the three photon energies. Furthermore, the presence of C2H2N2+,C3H3N+ and C4H4+ in the spectra of some of the molecules suggests dissociation pathways via loss of HCN moieties. The respective parent cations, m/q = 79, 80 and 81 have a greater yield at low photon energies when compared to the most intense fragment peak in each spectra. We recorded two of the fragment cation yields, as well as the parent photoion yield Curves of pyridine, pyridazine, and pyrimidine in the 8-30 eV range. The formation of abundant cation fragments show a strong propensity of the molecules for dissociation after the absorption of VUV photons higher than 14eV. The differences in relative fragment yields from molecule to molecule, and when changing the excitation energy, Suggest significant bond rearrangements and nuclear motion during the dissociation time. Thus, bond cleavage is dependent on the photon energy deposited in the molecule and on intramolecular reactivity. With the aid of photoion yield Curves and energy estimations we have assigned major peaks in the spectra and discussed their fragmentation pathways.

  • 10.
    Vall-llosera, Gemma
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Atomic and Molecular Physics.
    Álvarez Ruiz, Jesús
    KTH, School of Engineering Sciences (SCI), Physics, Atomic and Molecular Physics.
    Erman, Peter
    KTH, School of Engineering Sciences (SCI), Physics, Atomic and Molecular Physics.
    Melero García, Emilio
    KTH, School of Engineering Sciences (SCI), Physics, Atomic and Molecular Physics.
    Rachlew, Elisabeth
    KTH, School of Engineering Sciences (SCI), Physics, Atomic and Molecular Physics.
    Menmuir, Sheena
    KTH, School of Engineering Sciences (SCI), Physics, Atomic and Molecular Physics.
    Stankiewicz, Marek
    Instytut Fizyki, Jageillonian University.
    The npσ,π to EF emission systems in D2 studied by selective excitation2005In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 38, no 6, p. 659-664Article in journal (Refereed)
    Abstract [en]

    The np sigma 1 Sigma(u)(+) and np pi (1)Pi(u) states in D-2 have been selectively excited using monoenergetic synchrotron light in the range of 13.97-15.84 eV and the subsequent dispersed emission to the EF (1)Sigma(g)(+) state was observed using a grating spectrometer. In total, 18 emission bands from the levels n = 3-6 were studied and rotationally analysed. The intensities of the P and R branches relative to the Q branch were found to vary strongly in the np pi (1)Pi(u)(+)-EF(1)Sigma(g)(+) bands indicating the existence of predissociations of np pi (1)Pi(u)(+) levels above the dissociation limit D(1s) + D(2l).

  • 11.
    Álvarez Ruiz, Jesús
    et al.
    KTH, Superseded Departments, Physics.
    Erman, Peter
    KTH, Superseded Departments, Physics.
    Rachlew-Källne, Elisabeth
    KTH, Superseded Departments, Physics.
    Rius Riu, Jaume
    KTH, Superseded Departments, Physics.
    Stankiewicz, Marek
    KTH, Superseded Departments, Physics.
    Veseth, V.
    Neutral dissociation of superexcited states in carbon monoxide2002In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 35, no 13, p. 2975-2983Article in journal (Refereed)
    Abstract [en]

    Neutral photodissociation of CO has been investigated using synchrotron light in the range 19-26 eV by observing dispersed fluorescence from excited neutral C atoms. Follow-up ab initio calculations support the observed neutral carbon excitation functions, which to a large extent are associated with the CO Rydberg - series converging to the CO+ C and D states.

1 - 11 of 11
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf