A portable fibre-probe fluorescence detection system comprising a continuous-wave high-power ultraviolet light emitting diode (UV LED) at 365 nm as excitation source, bifurcated fibre probe with six-around-one configuration to illuminate and read from large target area (∼3.6 mm 2 ) an integrated PC-coupled spectrometer has been developed. The construction, calibration operation of the are described. Demonstrative test measurements for possible inspection different ripening stages on some...

For safety reasons, the need of a fast in situ technique for measuring change surface hardness nuclear reactor vessel walls due to ion bombardment has great importance. Material measurement using laser induced breakdown spectroscopy been demonstrated as new promising technique. The effect material matrix is one challenges that this may face. In work, plasma excitation temperature Te used measure relative some pure Ti and alloy samples with different hardnesses. these was changed by...

Twenty nine rovibronic lines of 12C17O for which laboratory wavelengths were previously unavailable detected in laser-induced fluorescence excitation spectra the six vibronic bands A1Π(υ' = 0-5)-X1Σ+(υ'' 0). Rovibronic 12C16O, 13 C16O, 12C17O, and 12C 18O each band, allowing accurate determination unknown using neighboring 12C16O 13C16O as reference. The new wavelength data yield consistent heliocentric velocity values when applied to vacuum ultraviolet observations interstellar medium.

The development of learning practices that enable students to transfer knowledge across contexts, is a dominant topic in Physics Education Research. Assessment key activity the process. purpose this paper illustrate value analysing introductory physics assessments using Semantics dimension Legitimation Code Theory. We discuss tools used analyse test and exam question papers two consecutive calculus-based modules. An analysis past over 5 years revealed various weaknesses. outcomes an...

Measurements of ultrafast transient processes, temporal durations in the picosecond and femtosecond regime, are made possible by pump probe absorption spectroscopy. Such an setup has been implemented at CSIR National Laser Centre applied to investigate energy transfer processes different parts photosynthetic systems. In this paper we report on our first results obtained with Malachite green as a benchmark. was chosen because lifetime its excited state is well known. We also present...

This tutorial covers the derivation of optical Bloch equations for a four-state atomic system interacting with an electromagnetic field via magnetic dipole transitions. The is discussed at length and from first principles such that any student or graduate basic quantum mechanics background could follow. shows numerical simulations model under different conditions, rounding off understanding dependencies model. Finally, functionality shown by fitting to experimental data ytterbium-171 ions...

Metal additive manufacturing (AM) is growing rapidly towards industrial adoption in various industries, but porosity remains a concern because it creates areas of stress that affects the mechanical properties and reduces reliability. Porosity can be quantified by X-ray computed tomography (XCT), method relatively slow expensive. The Archimedes density measurement widely used due to low cost ease operation; however, limited its precision for levels. In this work, series additively...

The forbidden singlet–triplet transitions of carbon monoxide (CO) are important in the interpretation vacuum ultraviolet interstellar absorption spectra and particular for measurement large CO column densities. Twenty rovibronic lines e3Σ−(ν' = 5) − X1Σ+(ν'' 0) band 12C16O which laboratory wavelengths were previously unavailable identified laser-induced fluorescence excitation spectra. Wavelengths assigned to five an average accuracy 0.0028 Å. A further 15 could not be fully resolved...

Electric field induced second harmonic (EFISH) generation typically increases with laser intensity. Therefore, EFISH signals generated at the rear <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mi mathvariant="normal">S</mml:mi> mathvariant="normal">i</mml:mi> </mml:mrow> <mml:mo>/</mml:mo> <mml:msub> mathvariant="normal">O</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:math> interface by a beam transmitted through thin...

Laser-Powder Bed Fusion (L-PBF) is one of the most widely used methods in additive manufacturing metals. This study optimized/recommended parameters on a commercial L-PBF system to manufacture series cantilever samples Ti6Al4V (ELI) alloy. During process material experienced residual stress (RS) causing cracking some struts and resulting warping as expected for these samples. The degree indicative amount RS problem as-built parts. It therefore important minimize this far possible. paper...

Isotope selective photoionization of ⁶⁷Zn is demonstrated with broadband excitation light (∼ 3.4 GHz), temporally separated laser pulses in the presence a weak external magnetic field. Starting natural zinc metal 4% ⁶⁷Zn) ion sample was enriched to ∼ 90% ⁶⁷Zn. Efficient suppression ionization even-mass isotopes achieved by intermediate state alignment scheme 4𝑠2 ¹𝑆₀ → 4𝑠4𝑝 ³𝑃₁ 4𝑠4𝑑 ³𝐷₁, followed nonresonant photoionization. The first pulse linearly polarized parallel transverse component...

Isotope selective photoionization of ⁶⁷Zn is demonstrated with broadband excitation light (∼ 3.4 GHz), temporally separated laser pulses in the presence a weak external magnetic field. Starting natural zinc metal 4% ⁶⁷Zn) ion sample was enriched to ∼ 90% ⁶⁷Zn. Efficient suppression ionization even-mass isotopes achieved by intermediate state alignment scheme 4𝑠2 ¹𝑆₀ → 4𝑠4𝑝 ³𝑃₁ 4𝑠4𝑑 ³𝐷₁, followed nonresonant photoionization. The first pulse linearly polarized parallel transverse component...

Isotope selective photoionization of ⁶⁷Zn is demonstrated with broadband excitation light (∼ 3.4 GHz), temporally separated laser pulses in the presence a weak external magnetic field. Starting natural zinc metal 4% ⁶⁷Zn) ion sample was enriched to ∼ 90% ⁶⁷Zn. Efficient suppression ionization even-mass isotopes achieved by intermediate state alignment scheme 4𝑠2 ¹𝑆₀ → 4𝑠4𝑝 ³𝑃₁ 4𝑠4𝑑 ³𝐷₁, followed nonresonant photoionization. The first pulse linearly polarized parallel transverse component...

Path entanglement is an essential resource for photonic quantum information processing, including in computing, communication and sensing. In this work, we experimentally study the generation verification of bipartite path-entangled states using single photons produced by a nitrogen-vacancy center within nanodiamond. We perform range measurements to characterize being generated verify presence path entanglement. The experiment performed continuous-wave laser excitation novel state...

Additive manufacturing is increasing in popularity and several industries are adapting to the technology. This due benefits of process such as allowing for complex designs using a variety materials. However, occurrence defects porosity remains major concern an active area research. In this study, we show how detection analysis X-ray computed tomography images performed different state art methods. The methods demonstrated compared Ti6Al4V cantilever samples with lack fusion gas at varying...