نتایج جستجو برای: parahydrogen
تعداد نتایج: 287 فیلتر نتایج به سال:
Parahydrogen-induced polarization (PHIP) was used to demonstrate the concept that highly polarized, catalyst-free fluids can be obtained in a catalysis-free regime using a chemical reaction with molecular addition of parahydrogen to a water-soluble Rh(I) complex carrying a payload of compound with unsaturated (C═C) bonds. Hydrogenation of norbornadiene leads to formation of norbornene, which is...
Tunneling chemical reactions between deuterated methyl radicals and the hydrogen molecule in a parahydrogen crystal have been studied by Fourier transform infrared spectroscopy. The tunneling rates of the reactions R + H2 --> RH + H (R = CD3,CD2H,CDH2) in the vibrational ground state were determined directly from the temporal change in the intensity of the rovibrational absorption bands of the ...
J. Dawidowski,* F. J. Bermejo, M. L. Ristig, B. Fåk, C. Cabrillo, R. Fernández-Perea, K. Kinugawa, and J. Campo Consejo Nacional de Investigaciones Cientı́ficas y Técnicas, Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energı́a Atómica, Universidad Nacional de Cuyo, (8400) Bariloche, Argentina Department of Electricity and Electronics, University of the Basque Country, P.O...
The interplay between magic number stabilities and superfluidity of small parahydrogen clusters with sizes N=5 to 40 and temperatures 0.5 K</=T</=4.5 K is explored with classical and quantum path integral Monte Carlo calculations. Clusters with N<26 and T</=1.5 K have large superfluid fractions even at the stable magic numbers 13, 19, and 23. In larger clusters, superfluidity is quenched especi...
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