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   https://doi.org/10.21468/SciPostPhysProc.5.025  

   Pocanic, Dinko (January 2021, SciPost Physics Proceedings)

   In common with a number of simple processes involving elementaryparticles, charged pion decays are profoundly shaped by applicableStandard Model (SM) symmetries and properties. Given the highly preciseSM theoretical description, pion decays are used as selective probes ofSM parameters, and of possible SM extensions. The PEN experiment at PSIis studying the \pi^+ \to e^+\nu_e(\gamma) π + → e + ν e ( γ ) ,or \pi_{e2(\gamma)} π e 2 ( γ ) decay. The primary goal is to reach the relative precision of 5 \times 10^{-4} 5 × 10 − 4 in R_{e/\mu}^\pi R e / μ π ,the branching ratio for \pi_{e2(\gamma)} π e 2 ( γ ) decay. We review the PEN research program, its present status, andprospects. 

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2. Electronic Spectroscopy and Photoionization of LiBe

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   Persinger, Thomas D.; Han, Jiande; Heaven, Michael C. (September 2021, The Journal of Physical Chemistry A)
3. Structural and Electronic Properties of Cu3InSe4

   https://doi.org/10.3390/cryst12091310  

   Ojo, Oluwagbemiga P.; Wong-Ng, Winnie; Chang, Tieyan; Chen, Yu-Sheng; Nolas, George S. (September 2022, Crystals)

   Single crystals of a new ternary chalcogenide Cu3InSe4 were obtained by induction melting, allowing for a complete investigation of the crystal structure by employing high-resolution single-crystal synchrotron X-ray diffraction. Cu3InSe4 crystallizes in a cubic structure, space group P4¯3m, with lattice constant 5.7504(2) Å and a density of 5.426 g/cm3. There are three unique crystallographic sites in the unit cell, with each cation bonded to four Se atoms in a tetrahedral geometry. Electron localization function calculations were employed in investigating the chemical bonding nature and first-principle electronic structure calculations are also presented. The results are discussed in light of the ongoing interest in exploring the structural and electronic properties of new chalcogenide materials. 

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4. Electronic Spectroscopy and Photoionization of LiMg

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   Persinger, Thomas D.; Han, Jiande; Heaven, Michael C. (May 2021, The Journal of Physical Chemistry A)

   null (Ed.)
5. 3D printed electronic materials and devices.

   https://doi.org/10.1016/B978-0-08-102260-3.00013-5  

   61. Su, R.; Park, S.H.; Li, Z. (October 2018, Woodhead Publishing reviews)

   Abstract 3D printing of functional materials and devices is an emerging technology which may facilitate a higher degree of freedom in the fabrication of electronic devices in terms of material selection, 3D device form factor, morphology of target surfaces, and autonomy. This chapter discusses 3D printed electronics from the perspective of ink properties and device fabrication, including light-emitting diodes, tactile sensors and wireless powering. In combination with the progress in 3D structured light scanning, advances in computer vision, and commercial trends toward miniaturization, the prospect of autonomous, compact and portable 3D printers for electronic materials is discussed. Because the performance of 3D printed electronics is sensitively influenced by the homogeneity of printed layers, an understanding of fluid mechanics may enhance the quality of the printing and thus the performance of the resulting devices. Lastly, in order to create conformal contact between 3D printed electronics and the human body, an understanding of interfacial mechanics for 3D printed devices is suggested. 

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