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Acetylene - Astrophysics Data System

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Last Updated: 10 November 2022

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Electron-impact cross sections of acetylene up to 5 keV

For acetylene from the ionization threshold up to 5 kev, electron impact cross sections like elastic, dissociative ionization, and the total are estimated. The binary-encounter-Bethe method has been used to produce dissociative partial ionization cross sections of several cations. The work highlights the role of mass spectrometry results in the analysis of the ionization process as well as the diverse nature of the BEB model.

Source link: https://ui.adsabs.harvard.edu/abs/2022EPJD...76...94G/abstract


Selective hydrogenation of acetylene to ethylene: Performance of a Pt monolayer over an α-WC(0001) surface for binding and hydroconversion of acetylene

Ethylene is a key hydrocarbon in polymerization reactions and as a probe system to investigate hydrogenation reactions of complex unsaturated hydrocarbons and olefins. This issue is solved by hydrogenating C 2 H 2 selectively into C 2 H 4, preventing further ethylene hydrogenation reactions. The Pt/U3B-W surface has the highest ability to convert C 2 H 2 into C 2 H 4 with a reaction energy of -0. 44 ev, avoiding further hydrogenation into ethyl and ethane among the tested systems, according to the theoretical findings, avoiding further hydrogenation into ethyl and ethane. As compared to bare u03b1-WC-W, the electron density flux from Pt/u03b1-WC-W to the C 2 H 2 and C 2 H 4 molecules is higher than bare u03b1-WC-W, since the Pt monolayer modulates electron density migration, as shown by a Projected Density of States research.

Source link: https://ui.adsabs.harvard.edu/abs/2023SurSc.72822197J/abstract


High sensitivity absorption spectroscopy of acetylene near 770 nm

0 -. 0 - sand, tylene, was discovered in the 12933-13087 cm -1 area with a sensitivity of 2 u00d7 10 -11 cm -1. In these spectra, six bands of 12 C 2 H 2 and one band of 12 C 13 CH 2 were mixed, as well as one band of 12 C 2 H 2 and one band of 12 C 13 CH 2 were assigned. The 3u3bd 1 + u03bd 3 band is the most popular one in this region. The line positions were modeled using the traditional power series formula in terms of the angular momentum quantum number for an isolated band. The line intensities were simulated using the vibrational transition dipole moment squared and the Herman-Wallis variables.

Source link: https://ui.adsabs.harvard.edu/abs/2023JQSRT.29408402L/abstract


3D printed hierarchical spinel monolithic catalysts for highly efficient semi-hydrogenation of acetylene

The intercalation of aluminate in LDH is found to be able to customize the M 2+ /Al 3+ ratio, integrate LDH nanosheets into a monolithic catalyst, and enable the conversion of LDH to spinel at a temperature of below 500 °C with high surface areas.

Source link: https://ui.adsabs.harvard.edu/abs/2022NaRes..15.6010Y/abstract


Simultaneous methane and acetylene detection using frequency-division multiplexed laser absorption spectroscopy

respectively, two infrared lasers were used to enhance C 2 H 2 and CH 4 absorption lines, which were located at 6539. 45 cm -1 and 6057. 09 cm -1. At a 0. 02-s integration time for C 2 H 2 with CH 4 and 0. 64 ppm, respectively, it was achieved at 0. 2 ppm for CH 4 and 0. 64 ppm, which could be increased to 55 ppm for CH 4 and 10 ppm for CH 4 and 10 ppm for CH 4 and 10 ppm, respectively, which can be further enhanced to 55 ppm for C 2 H 2 at an optimum integration time of 10-s and 15 integration a.

Source link: https://ui.adsabs.harvard.edu/abs/2022OptLT.15408285R/abstract


Molecular Structure, Dynamics, and Vibrational Spectroscopy of the Acetylene:Ammonia (1:1) Plastic Co-Crystal at Titan Conditions

The Saturnian moon Titan has a thick, organic-rich atmosphere, and condensed phases of small organic molecules are predicted to be stable on its surface. Many of these cryominerals may have rich phase structure, particularly multicomponent cryominerals whose component molecules have multiple solid phases. One of the most prominent cryomineral is the acetylene:ammonia co-crystal, and here we use density functional theory-based ab initio molecular dynamics simulations to determine its structure and dynamics at Titan conditions. Because the ammonia molecules are orientationally disordered, we demonstrate that the acetylene:ammonia co-crystal is a plastic co-crystal at Titan conditions. Moreover, the ammonia molecules in this co-crystal rotate on picosecond timescales, and this rotation is followed by the breakage and reformulation of hydrogen bonds between the ammonia hydrogens and the acetylene's pi-system.

Source link: https://ui.adsabs.harvard.edu/abs/2022arXiv221012188T/abstract


Highly Sensitive MEMS Sensor Using Bimetallic Pd–Ag Nanoparticles as Catalyst for Acetylene Detection

However, the most common dissolved gas analysis methods have always relied on bulky equipment and are time-consuming. The Ag shell is clearly shown on one face of the cubic Pd nanoseeds, as shown by a transmission electron microscopy photograph. The acetylene sensor has been created for acetylene detection by loading the PdU2013Ag bimetallic catalyst onto the surface of In2O3 sensing material. The high success of the microhotplate sensor for acetylene gas shows the possibility of trace acetylene detection in power transformer fault diagnosis.

Source link: https://ui.adsabs.harvard.edu/abs/2022Senso..22.7485T/abstract

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions