Time‐resolved Raman studies on Al₂O₃: Cr³⁺: lifetime measurements of the excited‐state transition Ē → 2Ā

Abstract

A time-resolved intensified charge coupled device-based Raman microspectrometer system dedicated to the study of solid samples is described, offering good optical, temporal and spatial resolution. The advantages of this approach are demonstrated on Al 2 O 3 :Cr 3+ , obtaining for the first time the temporal evolution of the excited state transitionĒ → 2Ā. Moreover, the time dependence of the luminescence due to the chromium ion was also determined by the same Raman device.

Nanosecond time‐resolved Raman spectroscopy for solving some Raman problems such as luminescence or thermal emission

“…The system is coupled with a pulsed 532 nm excitation laser (T40X30 FCBar, Spectra Physics) and a ICCD camera (Intensified Charged Coupled Device, AndoriStar DH720), allowing gated detection. More details of this experimental setup are given in refs . Two diffraction gratings 1800 and 600 grooves/mm as well as other detector were used: CCD for ordinary continuous measurements was used as calibration reference.…”

Recent advances in linear and nonlinear Raman spectroscopy. Part VI

“…Tobon et al . used time‐resolved Raman to study lifetimes and excited state transitions in Al 2 O 3 :Cr(3+) . They used a dedicated time‐resolved intensified charge‐coupled device‐based Raman microspectrometer system that provided good optical, temporal, and spatial resolution.…”

Glass structure of industrial ground granulated blast furnace slags (GGBS) investigated by time-resolved Raman and NMR spectroscopies

“…The absence of Raman studies of real, industrial slag glasses is likely due to luminescence of transition metals in complex glasses [41]. By using the noticeably different emission times of Raman and luminescence after a laser pulse, the use of timeresolved Raman spectroscopy can avoid those difficulties [42,43].…”

“…The literature is very abundant in the aluminosilicate domain and the effect of the different modifiers (alkaline, alkaline earth, or rare earth) has been widely explored [44,45]. Several isotopes are easily observable as 29 Si, 27 Al, 23 Na, others need isotopic enrichment ( 17 O, 43 Ca, 25 Mg, ...). NMR allows detailed description of the network of glasses with similar main oxide composition as GGBS.…”

“…Moreover, the isotope enrichment of industrial slags is obviously unachievable, preventing the use of correlation experiments and isotopes with low natural abundance such as 43 Ca.…”