Issue 3, 2007

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

Abstract

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-α (122 nm), Balmer-α (656 nm), Balmer-β (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. Álvarez Ruiz, M. Coreno, M. de Simone, R. Richter and K. C. Prince, Phys. Rev. Lett., 2006, 96, 063003].

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

Article information

Article type
Paper
Submitted
17 Jul 2006
Accepted
13 Nov 2006
First published
24 Nov 2006

Phys. Chem. Chem. Phys., 2007,9, 389-395

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

G. Vall-llosera, E. Melero García, A. Kivimäki, E. Rachlew, M. Coreno, M. de Simone, R. Richter and K. C. Prince, Phys. Chem. Chem. Phys., 2007, 9, 389 DOI: 10.1039/B610199B

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