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Fluorescence emission from photo-fragments after resonant S 2p excitations in H2S

Författare:
  • Gemma Vall-llosera (PhD)
  • Emilio Melero García
  • Antti Kivimäki
  • Elisabeth Rachlew
  • Marcello Coreno
  • Monica de Simone
  • Robert Richter
  • Kevin C. Prince
Publiceringsår: 2007
Språk: Engelska
Sidor: 389-395
Publikation/Tidskrift/Serie: Physical Chemistry Chemical Physics
Volym: 9
Nummer: 3
Dokumenttyp: Artikel

Sammanfattning

Visible-UV fluorescence emission of gas-phase hydrogen sulfide, H(2)S, has been studied at the S 2p edge with synchrotron radiation excitation. Dispersed fluorescence measurements in the wavelength range 300-900 nm were taken at several photon energies corresponding to the excitations of the S 2p electrons to the unoccupied molecular and Rydberg orbitals. The spectra reveal fluorescence from the H, S, S(+), HS and HS(+) photo-fragments. H is found to be the strongest emitter at Rydberg excitations, while the emission from S(+) is dominant at the molecular resonances and above the S 2p ionization thresholds. The intensities of hydrogen Lyman-alpha (122 nm), Balmer-alpha (656 nm), Balmer-beta (486 nm) transitions as well as the visible-UV total fluorescence yield (300-900 nm) and the total ion yield were measured by scanning the photon energy in small steps across the S 2p edge. The different Balmer lines show some sensitivity to the specific core excitations, which is, however, not so strong as that recently observed in the water molecule [E. Melero García, A. Kivimäki, L. G. M. Pettersson, J. Alvarez Ruiz, M. Coreno, M. de Simone, R. Richter and K. C. Prince, Phys. Rev. Lett., 2006, 96, 063003].

Disputation

Nyckelord

  • Physics and Astronomy

Övriga

Published
Yes
  • ISSN: 1463-9076

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