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1. On the formation and the isomer specific detection of methylacetylene (CH ₃ CCH), propene (CH ₃ CHCH ₂ ), cyclopropane (c-C ₃ H ₆ ), vinylacetylene (CH ₂ CHCCH), and 1,3-butadiene (CH ₂ CHCHCH ₂ ) from interstellar methane ice analogues

   https://doi.org/10.1039/C8CP03921F  

   Abplanalp, Matthew J. ; Góbi, Sándor ; Kaiser, Ralf I. ( March 2019 , Physical Chemistry Chemical Physics)

   Pure methane (CH 4 ) ices processed by energetic electrons under ultra-high vacuum conditions to simulate secondary electrons formed via galactic cosmic rays (GCRs) penetrating interstellar ice mantles have been shown to produce an array of complex hydrocarbons with the general formulae: C n H 2n+2 ( n = 4–8), C n H 2n ( n = 3–9), C n H 2n−2 ( n = 3–9), C n H 2n−4 ( n = 4–9), and C n H 2n−6 ( n = 6–7). By monitoring the in situ chemical evolution of the ice combined with temperature programmed desorption (TPD) studies and tunable single photon ionization coupled to a reflectron time-of-flight mass spectrometer, specific isomers of C 3 H 4 , C 3 H 6 , C 4 H 4 , and C 4 H 6 were probed. These experiments confirmed the synthesis of methylacetylene (CH 3 CCH), propene (CH 3 CHCH 2 ), cyclopropane (c-C 3 H 6 ), vinylacetylene (CH 2 CHCCH), 1-butyne (HCCC 2 H 5 ), 2-butyne (CH 3 CCCH 3 ), 1,2-butadiene (H 2 CCCH(CH 3 )), and 1,3-butadiene (CH 2 CHCHCH 2 ) with yields of 2.17 ± 0.95 × 10 −4 , 3.7 ±more »1.5 × 10 −3 , 1.23 ± 0.77 × 10 −4 , 1.28 ± 0.65 × 10 −4 , 4.01 ± 1.98 × 10 −5 , 1.97 ± 0.98 × 10 −4 , 1.90 ± 0.84 × 10 −5 , and 1.41 ± 0.72 × 10 −4 molecules eV −1 , respectively. Mechanistic studies exploring the formation routes of methylacetylene, propene, and vinylacetylene were also conducted, and revealed the additional formation of the 1,2,3-butatriene isomer. Several of the above isomers, methylacetylene, propene, vinylacetylene, and 1,3-butadiene, have repeatedly been shown to be important precursors in the formation of polycyclic aromatic hydrocarbons (PAHs), but until now their interstellar synthesis has remained elusive.« less
2. Sensitivity and Detection Limit of Spectroscopic‐Grade Perovskite CsPbBr ₃ Crystal for Hard X‐Ray Detection

   https://doi.org/10.1002/adfm.202112925  

   He, Yihui ; Hadar, Ido ; De Siena, Michael C. ; Klepov, Vladislav V. ; Pan, Lei ; Chung, Duck Young ; Kanatzidis, Mercouri G. ( March 2022 , Advanced Functional Materials)
3. Detection of 1 H -Triphosphirene ( c -HP ₃ ) and 2-Triphosphenylidene (HP ₃ ): The Isovalent Counterparts of 1 H -Triazirine ( c -HN ₃ ) and Hydrazoic Acid (HN ₃ )

   https://doi.org/10.1021/acs.jpclett.2c00639  

   Zhang, Chaojiang ; Zhu, Cheng ; Eckhardt, André K. ; Kaiser, Ralf I. ( March 2022 , The Journal of Physical Chemistry Letters)
4. Luminescence characteristics of rare-earth-doped barium hexafluorogermanate BaGeF ₆ nanowires: fast subnanosecond decay time and high sensitivity in H ₂ O ₂ detection

   https://doi.org/10.1039/c8ra07806h  

   George, Gibin ; Simpson, Machael D. ; Gautam, Bhoj R. ; Fang, Dong ; Peng, Jinfang ; Wen, Jianguo ; Davis, Jason E. ; Ila, Daryush ; Luo, Zhiping ( November 2018 , RSC Advances)

   Fluorides are promising host materials for optical applications. This paper reports the photoluminescent (PL) and cathodoluminescent (CL) characteristics of barium hexafluorogermanate BaGeF 6 nanowires codoped with Ce 3+ , Tb 3+ and Sm 3+ rare earth ions, produced by a solvothermal route. The synthesized BaGeF 6 nanowires exhibit uniform morphology and size distribution. X-ray diffraction divulges the one-dimensional growth of crystalline BaGeF 6 structure, with the absence of any impurity phases. Visible luminescence is recorded from the nanowires in green and red regions, when the nanowires are codoped with Ce 3+ /Tb 3+ , and Ce 3+ /Tb 3+ /Sm 3+ , respectively, under a UV excitation source. The PL emission from the codoped BaGeF 6 nanowires, when excited by a 254 nm source, originates from the efficient energy transfer bridges between Ce 3+ , Tb 3+ and Sm 3+ ions. The decay time of the visible luminescent emission from the nanowires is in the order of subnanoseconds, being one of the shortest decay time records from inorganic scintillators. The CL emission from the BaGeF 6 nanowires in the tunable visible range reveals their potential use for the detection of high-energy radiation. The PL emissions are sensitive to H 2more »O 2 at low concentrations, enabling their high-sensitivity detection of H 2 O 2 using BaGeF 6 nanowires. A comparison with BaSiF 6 nanowires is made in terms of decay time and its sensitivity towards H 2 O 2 .« less
5. A Photoionization Study on the Detection of 1‐Sila Glycolaldehyde (HSiOCH ₂ OH), 2‐Sila Acetic Acid (H ₃ SiCOOH), and 1,2‐Disila Acetaldehyde (HSiOSiH ₃ )

   https://doi.org/10.1002/chem.202004863  

   Chandra, Sankhabrata ; Eckhardt, André K. ; Turner, Andrew M. ; Tarczay, György ; Kaiser, Ralf I. ( February 2021 , Chemistry – A European Journal)