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PHOTOIONIZATION SPECTRA OF ATOMIC SULFUR FROM PHOTODISSOCIATION OF SULFIDES AT 193 NM DETECTED WITH PHOTOIONIZATION MASS SPECTROSCOPY

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/33453

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Title: PHOTOIONIZATION SPECTRA OF ATOMIC SULFUR FROM PHOTODISSOCIATION OF SULFIDES AT 193 NM DETECTED WITH PHOTOIONIZATION MASS SPECTROSCOPY
Creators: Pan, Wan-Chun; Lee, Yin-Yu; Chen, I-Chia
Issue Date: 2008
Abstract: Photodissociation dynamics of ethylene sulfide and trimethylene sulfide (TMS) at 193nm are investigated using the method of photoionization mass spectroscopy (PIMS). The product sulfur atoms from photolysis channels of C$_2$H$_4$S $\rightarrow$ C$_2$H$_4$ + S and C$_3$H$_6$S $\rightarrow$ C$_3$H$_6$ + S are ionized by VUV synchrotron radiation generated from the undulator at NSRRC U9CGM beamline then are detected by the quadruple mass spectrometer. The autoionizing spectra of sulfur atoms are resulted from one single photon excitation of the VUV light. The resolving power (E/$\Delta$E) of this work is determined by the resolving power of the spectrograph located at the beamline and the value is about 60000 at E = 10 eV. Because of the high spectral resolution of the light source, most lines are resolved and assigned to be autoionization series: ($^{2}$D${_o}$)$n$d$^{3}$S${^o}$, $^{3}$P${^o}$, $^{3}$D${^o}$, the $n$s${^3}$D${^o}$ series appear to be quasi-discrete. According to the assigned transitions and their spectral intensities we determine the branching ratio of sulfur atoms produced in the electronic states S (${^3}$P${_2,~_1,~_0}$) and S (${^1}$D${_2}$) from both TMS and ethylene sulfide after 193 nm photolysis. As the results in this work we find that the branching ratio of S (${^3}$P) to S (${^1}$D) from ethylene sulfide is 1.2 similar to the previous results. This work shows production of S (${^3}$P) from TMS that was not observed previously.
URI: http://hdl.handle.net/1811/33453
Other Identifiers: 2008-MI-07
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