Results 41 to 50 of about 12,068,996 (359)
Modelling of mercury isotope separation in CP stellar atmospheres: results and problems [PDF]
New Astron.Rev.53:240-245,2009, 2009 Formation of anomalous isotope abundances in the atmospheres of chemically peculiar (CP) stars can be explained by light-induced drift (LID). This effect is additional to the radiative acceleration and appears due to systematic asymmetry of radiative flux in partly overlapping isotopic spectral line profiles.
arxiv +1 more source
Pairing effects in Sn isotopes
Zeitschrift f�r Physik A Hadrons and Nuclei, 1996 An extensive study of pairing effects in the Sn isotopes is carried out. The pairing Hamiltonian is treated by the chain-calculation method which provides practically exact solutions while involving less computational work than a complete-basis diagonalization.
F. Andreozzi +4 more
openaire +5 more sources
Dynamical Mean-Field Theory of Electron-Phonon Interactions in Correlated Systems: Application to Isotope Effects on Electronic Properties [PDF]
Phys. Rev. B 65, 224301 (2002), 2001 We use a recently developed formalism (combining an adiabatic expansion and dynamical mean-field theory) to obtain expressions for isotope effects on electronic properties in correlated systems. As an example we calculate the isotope effect on electron effective mass for the Holstein model as a function of electron-phonon interaction strength and ...
arxiv +1 more source
The oxygen isotope effect on critical temperature in superconducting copper oxides [PDF]
Superconductor Science & Technology 17 (2004) 721 - 723, 2003 The isotope effect provided a crucial key to the development of the BCS (Bardeen-Cooper-Schrieffer) microscopic theory of superconductivity for conventional superconductors. In superconducting cooper oxides (cuprates) showing an unconventional type of superconductivity, the oxygen isotope effect is very peculiar: the exponential coefficient strongly ...
arxiv +1 more source
Enzymatic oxidation of substituted tryptamines catalysed by monoamine oxidase
Nukleonika, 2014 The enzymatic deamination of 5-fl uorotryptamine and 5-hydroxytryptamine, 5-HT, catalysed by enzyme monoamine oxidase A (MAO-A, EC 1.4.3.4) was investigated using the kinetic (KIE) and solvent (SIE) isotope effects methods.
Dragulska Sylwia, Kańska Marianna
doaj +1 more source
Intrinsic and structural isotope effects in Fe-based superconductors [PDF]
Phys. Rev. B 82, 212505 (2010), 2010 The currently available results of the isotope effect on the superconducting transition temperature T_c in Fe-based high-temperature superconductors (HTS) are highly controversial. The values of the Fe isotope effect (Fe-IE) exponent \alpha_Fe for various families of Fe-based HTS were found to be as well positive, as negative, or even be exceedingly ...
arxiv +1 more source
Unconventional isotope effect on transition temperature in BiS2-based superconductor Bi4O4S3 [PDF]
Appl. Phys. Express 13, 093001(1-5) (2020), 2020 We report the sulfur isotope effect on transition temperature in a BiS2-based superconductor Bi4O4S3. Polycrystalline samples of Bi4O4S3 were prepared using 32S and 34S isotope chemicals. From magnetization analyses, the isotope exponent (aS) was estimated as -0.1 < aS < 0.1.
arxiv +1 more source
Sulfur Isotope Effects of Dissimilatory Sulfite Reductase
bioRxiv, 2015 The precise interpretation of environmental sulfur isotope records requires a quantitative understanding of the biochemical controls on sulfur isotope fractionation by the principle isotope-fractionating process within the S cycle, microbial sulfate ...
W. Leavitt +4 more
semanticscholar +1 more source
NMR and IR Investigations of Strong Intramolecular Hydrogen Bonds
Molecules, 2017 For the purpose of this review, strong hydrogen bonds have been defined on the basis of experimental data, such as OH stretching wavenumbers, νOH, and OH chemical shifts, δOH (in the latter case, after correction for ring current effects). Limits for O–H·
Poul Erik Hansen, Jens Spanget-Larsen
doaj +1 more source
Nature, 1990 The electron spin selectivity of radical reactions is accompanied by nuclear spin selectivity, i.e., sorting of the isotopic nuclei relative to their magnetic moment. This property of spin-selective reactions produces separation of magnetic and nonmagnetic isotopes known as the magnetic isotope effect.
Anatolii L Buchachenko +2 more
openaire +2 more sources