X-ray excited optical luminescence of CaF<sub>2</sub>: A candidate for UV water treatment

W, Chen; Ma, Li; Schaeffer, Roger O.; Hoffmeyer, Ruth E.; Sham, Tsun‐Kong; Belev, George; Kasap, S. O.; Sammynaiken, Ramaswami

doi:10.1088/1742-6596/619/1/012047

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…It has to be taken into account than the intensity of the CaF 2 yield is higher detected by the Si detector. The observable long "tail" of the CaF 2 signal is due to the secondary photoluminescence effect induced in the filter by the incident X-rays, which can be more than 100 ns long, in agreement with the literature [20].…”

Section: Plasma Evolution Vs Timesupporting

confidence: 90%

Characterization of Si and SiC detectors for laser-generated plasma monitoring in short wavelength range

Torrisi

Wachulak²,

Fiedorowicz

et al. 2020

J. Inst.

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A: Silicon carbide detectors were employed to characterize the plasma produced by laser interaction with a double stream gas-puff target source. A 10 Hz repetition rate Nd:YAG laser (1064 nm wavelength, 0.69 J pulse energy and 3 ns pulse duration) was employed to irradiate different gas-puff targets (Argon, Xenon and Sulfur hexafluoride), at different pressures (1-10 bar), emitting plasma radiation in different wavelength ranges (ultraviolet, extreme ultraviolet and soft X-rays). The emission produced by the laser radiation was properly filtered (employing Titanium, Aluminium, Zirconium and Calcium fluoride filters), to narrow down the broad-band emission of the generated plasma. The SiC detectors' signals were compared with a calibrated traditional silicon detector evaluating their differences, i.e. taking into account the plasma stability, the time trace profile and the characteristics of the gas-puff target source. The obtained results, which will be presented and discussed, allow to improve the geometry and configuration of the SiC detectors avoiding saturation and charge recombination effects and getting a better proportionality to the energy and fluence of the detected radiations. K: Detectors for UV, visible and IR photons; Plasma generation (laser-produced, RF, x ray-produced); Radiation monitoring; X-ray detectors 1Corresponding author.

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Section: Plasma Evolution Vs Timesupporting

confidence: 90%

Characterization of Si and SiC detectors for laser-generated plasma monitoring in short wavelength range

Torrisi

Wachulak²,

Fiedorowicz

et al. 2020

J. Inst.

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“…Figure 1A shows the X-ray absorbance as optical density of unextracted and calcium-treated onion cell wall. The energy range for the calcium L 3,2 edge is 330.0 to 360.0 eV ( Chen et al., 2015 ; Ye et al., 2018 ), and the peaks in the NEXAFS spectra at 349.3 eV and 352.6 eV are due to 2p → 3d Ca L 3 and L 2 transitions, respectively ( Naftel et al., 2001 ; Ingham et al., 2015 ; Ye et al., 2018 ). The NEXAFS absorbance at the Ca edges is higher for calcium-treated cell wall when compared to unextracted samples.…”

Section: Resultsmentioning

confidence: 99%

Measuring calcium content in plants using NEXAFS spectroscopy

Rongpipi,

Barnes,

Siemianowski

et al. 2023

Front. Plant Sci.

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Calcium is important for the growth and development of plants. It serves crucial functions in cell wall and cell membrane structure and serves as a secondary messenger in signaling pathways relevant to nutrient and immunity responses. Thus, measuring calcium levels in plants is important for studies of plant biology and for technology development in food, agriculture, energy, and forest industries. Often, calcium in plants has been measured through techniques such as atomic absorption spectrophotometry (AAS), inductively coupled plasma–mass spectrometry (ICP-MS), and electrophysiology. These techniques, however, require large sample sizes, chemical extraction of samples or have limited spatial resolution. Here, we used near-edge X-ray absorption fine structure (NEXAFS) spectroscopy at the calcium L- and K-edges to measure the calcium to carbon mass ratio with spatial resolution in plant samples without requiring chemical extraction or large sample sizes. We demonstrate that the integrated absorbance at the calcium L-edge and the edge jump in the fluorescence yield at the calcium K-edge can be used to quantify the calcium content as the calcium mass fraction, and validate this approach with onion epidermal peels and ICP-MS. We also used NEXAFS to estimate the calcium mass ratio in hypocotyls of a model plant, Arabidopsis thaliana, which has a cell wall composition that is similar to that of onion epidermal peels. These results show that NEXAFS spectroscopy performed at the calcium edge provides an approach to quantify calcium levels within plants, which is crucial for understanding plant physiology and advancing plant-based materials.

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“…Further research will be conducted in order to investigate the long pulse duration obtained using the CaF 2 filter extended up to 100 ns. For both detectors (but, in particular, for HS1, having the lower energy gap of 1.1 eV with respect to the 3.3 eV of SiC), it is possible to observe a long signal tail that may be generated due to the partial UV radiation from the plasma transmitted through the sample or due to the induced luminescence [25].…”

Section: B Measurement Of the Signal Intensitymentioning

confidence: 99%

Monitoring of the plasma generated by a gas-puff target source

Torrisi¹,

Wachulak

Fiedorowicz

et al. 2019

Phys. Rev. Accel. Beams

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A 10-Hz repetition rate, Nd:YAG pulsed laser (λ ¼ 1064 nm, pulse energy of 0.69 J, pulse duration of 3 ns) irradiated a Xe double-stream gas-puff target source. The interaction gives rise to the formation of plasma and emission of soft x-ray and extreme ultraviolet radiation. The produced plasma was investigated and characterized by a silicon carbide (SiC) and a commercial silicon (Si) detector, applying different spectral filters. Some parameters such as the plasma stability and its evolution (time trace profile and pulse time duration) are presented and discussed, evidencing pros and cons of the employment of SiC detectors with respect to the traditional Si for laser-generated plasma diagnostic.

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X-ray excited optical luminescence of CaF₂: A candidate for UV water treatment

Cited by 6 publications

References 7 publications

Characterization of Si and SiC detectors for laser-generated plasma monitoring in short wavelength range

Characterization of Si and SiC detectors for laser-generated plasma monitoring in short wavelength range

Measuring calcium content in plants using NEXAFS spectroscopy

Monitoring of the plasma generated by a gas-puff target source

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X-ray excited optical luminescence of CaF2: A candidate for UV water treatment

Cited by 6 publications

References 7 publications

Characterization of Si and SiC detectors for laser-generated plasma monitoring in short wavelength range

Characterization of Si and SiC detectors for laser-generated plasma monitoring in short wavelength range

Measuring calcium content in plants using NEXAFS spectroscopy

Monitoring of the plasma generated by a gas-puff target source

Contact Info

Product

Resources

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X-ray excited optical luminescence of CaF₂: A candidate for UV water treatment