Time-resolved and continuous-wave circular polarisation of luminescence spectroscopy using a commercial spectrofluorimeter

AbstractOptical pump-probe measurements were performed on planar slab waveguides containing silicon nanocrystals in an attempt to measure optical gain from photo-excited silicon nanocrystals. Two experiments were performed, one with a continuous-wave probe beam and a pulsed pump beam, giving a time resolution of approximately 25 ns, and the other with a pulsed pump and probe beam, giving a time resolution of approximately 10 ps. In both cases the intensity of the probe beam was found to be attenuated by the pump beam, with the attenuation increasing monotonically with increasing pump power. Time-resolved measurements using the first experimental arrangement showed that the probe signal recovered its initial intensity on a time scale of 45-70 μs, a value comparable to the exciton lifetime in Si nanocrystals. These data are shown to be consistent with an induced absorption process such as confined carrier absorption. No evidence for optical gain was observed.

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Time-resolved in-situ temperature measurement and analysis for continuous-wave laser sintering of carbon nanotube – Metal composites on a polymer substrate

Journal of Manufacturing Processes ◽

10.1016/j.jmapro.2021.04.005 ◽

2021 ◽

Vol 66 ◽

pp. 435-445

Author(s):

Hanyu Song ◽

Zheng Kang ◽

Benxin Wu

Keyword(s):

Carbon Nanotube ◽

Temperature Measurement ◽

Continuous Wave ◽

Polymer Substrate ◽

Continuous Wave Laser ◽

Metal Composites ◽

Time Resolved ◽

Measurement And Analysis ◽

Wave Laser

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Time resolved luminescence spectroscopy of alkaline earth oxides after pulsed electron beam irradiation. I. Spectra and thresholds of CaO and CaO:Mg

The Journal of Chemical Physics ◽

10.1063/1.453823 ◽

1988 ◽

Vol 88 (7) ◽

pp. 4158-4170 ◽

Cited By ~ 10

Author(s):

Janice L. Grant ◽

Ronald Cooper ◽

John F. Boas

Keyword(s):

Electron Beam ◽

Alkaline Earth ◽

Electron Beam Irradiation ◽

Luminescence Spectroscopy ◽

Beam Irradiation ◽

Time Resolved ◽

Pulsed Electron Beam

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Time-Resolved Quadrupole Mass Spectrometric Studies on Pulsed Laser Ablation of TiO2

Laser Chemistry ◽

10.1155/1999/39826 ◽

1999 ◽

Vol 18 (3) ◽

pp. 99-109 ◽

Cited By ~ 1

Author(s):

Yongxin Tang ◽

Zhenhui Han ◽

Qizong Qin

Keyword(s):

Laser Ablation ◽

Continuous Wave ◽

Center Of Mass ◽

Pulsed Laser ◽

Pulsed Laser Ablation ◽

Ionic Species ◽

Mass Spectrometric ◽

Quadrupole Mass ◽

Time Resolved ◽

Ambient Oxygen

Pulsed laser ablation of TiO2 at 355 nm and 532 nm has been investigated using an angleand time-resolved quadrupole mass spectrometric technique. The major ablated species include O (m/e = 16), O2 (m/e = 32), Ti (m/e = 48), TiO (m/e = 64) and TiO2 (m/e = 80). The time-of-flight (TOF) spectra of ablated species are measured for the ionic and neutral ablated species, and they can be fitted by a Maxwell – Boltzmann (M – B) distribution with a center-of-mass velocity. The measured angular distributions of the ionic species (O+ and Ti+) and the neutral species (O and Ti) can be fitted with cos⁡nθ and a cos⁡θ + (1−a)cos⁡nθ, respectively. In addition, a continuous wave oxygen molecular beam is introduced into the ablated plume, and the enhancement of the signal intensities of TiO is observed. It implies that the ablated Ti atoms/ions species can react with ambient oxygen molecules in the gas phase. In the meanwhile, the physicochemical mechanism of pulsed laser ablation of TiO2 is discussed.

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Eu(III)–Fulvic Acid Complexation: Evidence of Fulvic Acid Concentration Dependent Interactions by Time-Resolved Luminescence Spectroscopy

Environmental Science & Technology ◽

10.1021/acs.est.5b05456 ◽

2016 ◽

Vol 50 (7) ◽

pp. 3706-3713 ◽

Cited By ~ 12

Author(s):

Yasmine Z. Kouhail ◽

Marc F. Benedetti ◽

Pascal E. Reiller

Keyword(s):

Fulvic Acid ◽

Acid Concentration ◽

Luminescence Spectroscopy ◽

Time Resolved

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Techniques in Time-Resolved Luminescence Spectroscopy

Semiconductors Probed by Ultrafast Laser Spectroscopy ◽

10.1016/b978-0-12-049902-1.50016-5 ◽

1984 ◽

pp. 393-407 ◽

Cited By ~ 1

Author(s):

D.L. ROSEN ◽

A.G. DOUKAS ◽

A. KATZ ◽

Y. BUDANSKY ◽

R.R. ALFANO

Keyword(s):

Luminescence Spectroscopy ◽

Time Resolved

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Luminescence of uranium(VI) after liquid-liquid extraction from HCl by Aliquat® 336 in n-dodecane:1-decanol by time-resolved laser-induced luminescence spectroscopy

Radiochimica Acta ◽

10.1515/ract-2019-3177 ◽

2020 ◽

Vol 108 (7) ◽

pp. 527-533 ◽

Cited By ~ 1

Author(s):

Pascal E. Reiller ◽

Clarisse Mariet

Keyword(s):

Organic Phase ◽

Decay Time ◽

Specific Interaction ◽

Intensity Variation ◽

Pitzer Model ◽

Luminescence Spectroscopy ◽

Luminescence Spectra ◽

Time Resolved ◽

Crystal Field Effect ◽

Hcl Concentration

AbstractTo investigate the extraction of uranium(VI) in HCl media by Aliquat® 336 in 1:99 (v:v) 1-decanol:n-dodecane mixture, our objective is to identify the complexe(s) in the organic phase by time-resolved laser-induced luminescence spectroscopy (TRLS). The extraction mechanism is supposed to involve the formation of $[U{O_2}Cl_4^{2 - } \cdot {({R_4}{N^ + })_2}]$ in the organic phase. The occurrence of such a species leads to the presence of the ${\rm{U}}{{\rm{O}}_2}{\rm{Cl}}_4^{2 - }$ species in the organic solution, which luminescence shows particular features. The luminescence spectra and decay time evolutions are obtained in the organic phase as a function of HCl concentration in the aqueous phase (0.5–6 M). The extraction of ${\rm{U}}{{\rm{O}}_2}{\rm{Cl}}_4^{2 - }$ is confirmed by the particular spectrum of uranium(VI) in the organic phase, and the typical splitting of the luminescence bands, due to the crystal field effect, is clearly evidenced. The stoichiometry is verified using luminescence intensity variation as a function of the activity of Cl−, and extraction constants are calculated both using the specific interaction theory and Pitzer model. A decomposition of the spectrum of the extracted complex in the organic phase is also proposed. The decay time variation as a function of temperature allows estimating the activation energy of the luminescence process of the extracted complex.

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