Results 171 to 180 of about 11,464 (229)
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Ionization energy measurements and spectroscopy of HfO and HfO+
The Journal of Chemical Physics, 2009Rotationally resolved spectra for the HfO+ cation have been recorded using the pulsed field ionization zero electron kinetic energy (PFI-ZEKE) technique. Resonant excitation of the F(0+)←X Σ1+ band system of HfO was used as an intermediate level providing molecule and rovibrational state selectivity in the ionization process. The ionization energy (IE)
Jeremy M, Merritt +2 more
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On the Ionization Energy of HfO
The Journal of Physical Chemistry A, 2009Using a newly developed relativistic pseudopotential and a series of correlation consistent basis sets for Hf, the ionization energy of HfO and the spectroscopic properties of the HfO(+) cation have been determined in coupled cluster calculations. After accounting for basis set incompleteness, outer-core correlation, the pseudopotential approximation ...
Hermann, Stoll +3 more
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Physica Scripta, 1971
The band spectrum of the diatomic molecule Hf180O16 has been investigated in emission in the region 2 300-11 500 A. 28 bands belonging to 6 different band systems have been rotationally analysed. The 6 band systems are due to transitions from 6 excited electronic states to the ground state X1Σ.
G Edvinsson, C H Nylén
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The band spectrum of the diatomic molecule Hf180O16 has been investigated in emission in the region 2 300-11 500 A. 28 bands belonging to 6 different band systems have been rotationally analysed. The 6 band systems are due to transitions from 6 excited electronic states to the ground state X1Σ.
G Edvinsson, C H Nylén
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(E)-1,2-Difluoroethylene (HFO-1132E)
Toxicology and Industrial Health, 2022(E)-1,2-Difluoroethylene (HFO-1132E) is a colorless gas used as a refrigerant. HFO-1132E has low acute toxicity following inhalation exposure in rats and dogs. HFO-1132E caused neither cardiac sensitization in dogs nor reproductive or developmental toxicity in rats following repeated inhalation exposure.
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Biotransformation of 2,3,3,3-tetrafluoropropene (HFO-1234yf)
Toxicology and Applied Pharmacology, 20082,3,3,3-Tetrafluoropropene (HFO-1234yf) is a non-ozone-depleting fluorocarbon replacement with a low global warming potential which has been developed as refrigerant. The biotransformation of HFO-1234yf was investigated after inhalation exposure. Male Sprague-Dawley rats were exposed to air containing 2000, 10,000, or 50,000 ppm HFO-1234yf for 6 h and ...
Paul, Schuster +6 more
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Flammability characteristics of HFO‐1234yf
Process Safety Progress, 2009Abstract A new low global warming refrigerant, CF 3 CF=CH 2 (HFO‐1234yf), has been developed to replace HFC‐134a in automotive air conditioning systems.
Barbara H. Minor +2 more
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2020
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Environmental impacts of HFO-1234yf and other HFOs
2012Currently several unsaturated hydrofluorocarbons, also termed hydorfluoroolefins, (HFO) are evaluated as replacements for previously used saturated hydrofluorocarbons (HFC) with large global warming potentials. Some of these new HFOs are oxidized in the troposphere and form the persistent and mildly phytotoxic trifluoroacetic acid (TFA) with larger ...
Henne, S. +6 more
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Catalytic activity of HFO₂ and Re-doped HFO₂ in benzyl acetate synthesis
Conferinţa ştiinţifico-practică internaţională "Instruire prin cercetare pentru o societate prosperă" = International scientific practical conference "Education through research for a prosperous society", 1-2 martie 2025. Vol. 1: Ştiinţe ale Naturii = Natural SciencesThis study investigates the catalytic activity of pure and rhenium-doped hafnium oxide (HfO₂:Re) in the esterification reaction of benzyl alcohol with acetic acid. The catalysts were synthesized using the polymeric precursor method and characterized by XRD and SEM-EDS.
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Atmospheric Environment, 2010
Abstract The photochemical ozone creation potentials (POCPs) for CF3CF CH2 and other commercially significant hydrofluoroolefins have been estimated for the first time. CF3CF CH2 (HFO-1234yf) has a POCP of 7.0 which is less than that for ethane (12.3) and greater than for methane (0.6).
Wallington, T. J. +2 more
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Abstract The photochemical ozone creation potentials (POCPs) for CF3CF CH2 and other commercially significant hydrofluoroolefins have been estimated for the first time. CF3CF CH2 (HFO-1234yf) has a POCP of 7.0 which is less than that for ethane (12.3) and greater than for methane (0.6).
Wallington, T. J. +2 more
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