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Electronic and vibrational states of oxygen and sulfur molecular ions inside implanted SiO2 films

“…In our data the almost exact coincidence of the oscillations positions with the values obtained in [7] proves the sulfur nature of the luminescent center observed. The fast kinetics of the 4.4 eV PLE peak also suggests a direct intracenter excitation character and agrees well with known value 17-19 ns for the S 2 molecule [10].…”

“…Their values were derived by parabolic approximation of experimental ν(n') and ν(n'') dependencies. Attributing observed low-energy vibronic lines to n = 1 for all progressions we have got the best approximation with ν 00 values close to reference data available [7,10].…”

“…3) taking into account experimental conditions and using the technique proposed in [9]. Comparing our experimental results, interference pattern and PL excitation spectrum for sulfur-doped silica fiber [7] (Fig. 3), one can note that the positions and widths of multiple PLE maxima for the SiO 2 :S + sample are in good agreement with those of interference fringes.…”

“…As it was shown in [7], both the absorption and photoluminescence excitation bands located at 4.4 eV have a resolved vibrational structure and are assigned to the S 2 molecules weakly bound to the SiO 2 network. In our data the almost exact coincidence of the oscillations positions with the values obtained in [7] proves the sulfur nature of the luminescent center observed.…”

“…However recent low-temperature photoluminescence (PL) studies of sulfur-loaded silica fiber cores [7,8] reveal a pronounced vibrational structure lying over S-related PL bands. Some of them were attributed to diatomic interstitial S 2 molecule while others to more complex SO 2 .…”