Fluorescence emission from photo-fragments after resonant S 2p excitations in H2S
2007 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 9, no 3, 389-395 p.Article in journal (Refereed) Published
Visible-UV fluorescence emission of gas-phase hydrogen sulfide, H2S, 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.
Place, publisher, year, edition, pages
2007. Vol. 9, no 3, 389-395 p.
X-RAY EXCITATION, DECAY CHANNELS, PHOTOELECTRON-SPECTROSCOPY, AUGER DECAY, MOLECULES, PHOTOIONIZATION, STATES, ATOMS
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-7998DOI: 10.1039/b610199bISI: 000243204200008ScopusID: 2-s2.0-33845962796OAI: oai:DiVA.org:kth-7998DiVA: diva2:13200
QC 201009162008-02-202008-02-202010-09-16Bibliographically approved