V. Ezhov | Petersburg Nuclear Physics Institute (original) (raw)

Papers by V. Ezhov

Research paper thumbnail of Content and Isotope Ratios of Noble Gases in Congelation Ice of Lake Vostok

Technical Physics, 2018

Isotope ratios of noble gases (He, Ne, Ar) were studied in samples collected by degassing of core... more Isotope ratios of noble gases (He, Ne, Ar) were studied in samples collected by degassing of cores of water frozen over a glacier of Lake Vostok. The gases were collected into glass retorts during three days of degassing of cores, which have just been extracted from the borehole. Within the error, the isotope 3 He/ 4 He ratios of 0.28 ± 0.

Research paper thumbnail of Calculation of P, T-Odd Effects in T205lF Including Electron Correlation

Physical Review Letters, 2002

A method and codes for two-step correlation calculation of heavy-atom molecules have been develop... more A method and codes for two-step correlation calculation of heavy-atom molecules have been developed, employing the generalized relativistic effective core potential (GRECP) and relativistic coupled cluster (RCC) methods at the first step, followed by nonvariational one-center restoration of proper four-component spinors in the heavy cores. Electron correlation is included for the first time in an ab initio calculation of the interaction of the permanent P, T-odd proton electric dipole moment with the internal electromagnetic field in a molecule. Inclusion of electron correlation by GRECP/RCC has a major effect on the P, T-odd parameters of 205 TlF, decreasing M by 17% and X by 22%.

Research paper thumbnail of Enhancement of the electric dipole moment of the electron in the YbF molecule

Journal of Physics B: Atomic, Molecular and Optical Physics, 1997

We report results of ab initio calculation of the spin-rotational Hamiltonian parameters includin... more We report results of ab initio calculation of the spin-rotational Hamiltonian parameters including P-and P,T-odd terms for the BaF molecule. The ground-state wave function of BaF molecule is found with the help of the relativistic effective core potential method followed by the restoration of molecular four-component spinors in the core region of barium in the framework of a nonvariational procedure. Core polarization effects are included with the help of the atomic many-body perturbation theory for the Barium atom. For the hyperfine constants the accuracy of this method is about 5-10 %. ͓S1050-2947͑97͒50311-8͔

Research paper thumbnail of P,T-odd spin-rotational Hamiltonian for YbF molecule

Physical Review Letters, 1996

ABSTRACT

Research paper thumbnail of Diffuse scattering in Ih ice

Journal of physics. Condensed matter : an Institute of Physics journal, Jan 2, 2014

Single crystals of ice Ih, extracted from the subglacial Lake Vostok accretion ice layer (3621 m ... more Single crystals of ice Ih, extracted from the subglacial Lake Vostok accretion ice layer (3621 m depth) were investigated by means of diffuse x-ray scattering and inelastic x-ray scattering. The diffuse scattering was identified as mainly inelastic and rationalized in the frame of ab initio calculations for the ordered ice XI approximant. Together with Monte-Carlo modelling, our data allowed reconsidering previously available neutron diffuse scattering data of heavy ice as the sum of thermal diffuse scattering and static disorder contribution.

Research paper thumbnail of Diffuse scattering in ice Ih

Single crystals of ice Ih, extracted from the subglacial Lake Vostok accretion ice layer (3621 m ... more Single crystals of ice Ih, extracted from the subglacial Lake Vostok accretion ice layer (3621 m depth) were investigated by means of diffuse x-ray scattering and inelastic x-ray scattering. The diffuse scattering was identified as mainly inelastic and rationalized in the frame of ab initio calculations for the ordered ice XI approximant. Together with Monte-Carlo modelling our data allowed reconsidering previously available neutron diffuse scattering data of heavy ice as the sum of thermal diffuse scattering and static disorder contribution.

Research paper thumbnail of Enhancement of the electric dipole moment of the electron in the YbF molecule

Journal of Physics B: Atomic, Molecular and Optical Physics, 1997

The a1 state of PbO can be used to measure the electric dipole moment of the electron d e . We di... more The a1 state of PbO can be used to measure the electric dipole moment of the electron d e . We discuss a semiempirical model for this state, which yields an estimate of the effective electric field on the valence electrons in PbO. Our final result is a lower limit on the measurable energy shift, which is significantly larger than was anticipated earlier: 2jW d jd e 2:4 10 25 Hz d e e cm .

Research paper thumbnail of Content and Isotope Ratios of Noble Gases in Congelation Ice of Lake Vostok

Technical Physics, 2018

Isotope ratios of noble gases (He, Ne, Ar) were studied in samples collected by degassing of core... more Isotope ratios of noble gases (He, Ne, Ar) were studied in samples collected by degassing of cores of water frozen over a glacier of Lake Vostok. The gases were collected into glass retorts during three days of degassing of cores, which have just been extracted from the borehole. Within the error, the isotope 3 He/ 4 He ratios of 0.28 ± 0.

Research paper thumbnail of Calculation of P, T-Odd Effects in T205lF Including Electron Correlation

Physical Review Letters, 2002

A method and codes for two-step correlation calculation of heavy-atom molecules have been develop... more A method and codes for two-step correlation calculation of heavy-atom molecules have been developed, employing the generalized relativistic effective core potential (GRECP) and relativistic coupled cluster (RCC) methods at the first step, followed by nonvariational one-center restoration of proper four-component spinors in the heavy cores. Electron correlation is included for the first time in an ab initio calculation of the interaction of the permanent P, T-odd proton electric dipole moment with the internal electromagnetic field in a molecule. Inclusion of electron correlation by GRECP/RCC has a major effect on the P, T-odd parameters of 205 TlF, decreasing M by 17% and X by 22%.

Research paper thumbnail of Enhancement of the electric dipole moment of the electron in the YbF molecule

Journal of Physics B: Atomic, Molecular and Optical Physics, 1997

We report results of ab initio calculation of the spin-rotational Hamiltonian parameters includin... more We report results of ab initio calculation of the spin-rotational Hamiltonian parameters including P-and P,T-odd terms for the BaF molecule. The ground-state wave function of BaF molecule is found with the help of the relativistic effective core potential method followed by the restoration of molecular four-component spinors in the core region of barium in the framework of a nonvariational procedure. Core polarization effects are included with the help of the atomic many-body perturbation theory for the Barium atom. For the hyperfine constants the accuracy of this method is about 5-10 %. ͓S1050-2947͑97͒50311-8͔

Research paper thumbnail of P,T-odd spin-rotational Hamiltonian for YbF molecule

Physical Review Letters, 1996

ABSTRACT

Research paper thumbnail of Diffuse scattering in Ih ice

Journal of physics. Condensed matter : an Institute of Physics journal, Jan 2, 2014

Single crystals of ice Ih, extracted from the subglacial Lake Vostok accretion ice layer (3621 m ... more Single crystals of ice Ih, extracted from the subglacial Lake Vostok accretion ice layer (3621 m depth) were investigated by means of diffuse x-ray scattering and inelastic x-ray scattering. The diffuse scattering was identified as mainly inelastic and rationalized in the frame of ab initio calculations for the ordered ice XI approximant. Together with Monte-Carlo modelling, our data allowed reconsidering previously available neutron diffuse scattering data of heavy ice as the sum of thermal diffuse scattering and static disorder contribution.

Research paper thumbnail of Diffuse scattering in ice Ih

Single crystals of ice Ih, extracted from the subglacial Lake Vostok accretion ice layer (3621 m ... more Single crystals of ice Ih, extracted from the subglacial Lake Vostok accretion ice layer (3621 m depth) were investigated by means of diffuse x-ray scattering and inelastic x-ray scattering. The diffuse scattering was identified as mainly inelastic and rationalized in the frame of ab initio calculations for the ordered ice XI approximant. Together with Monte-Carlo modelling our data allowed reconsidering previously available neutron diffuse scattering data of heavy ice as the sum of thermal diffuse scattering and static disorder contribution.

Research paper thumbnail of Enhancement of the electric dipole moment of the electron in the YbF molecule

Journal of Physics B: Atomic, Molecular and Optical Physics, 1997

The a1 state of PbO can be used to measure the electric dipole moment of the electron d e . We di... more The a1 state of PbO can be used to measure the electric dipole moment of the electron d e . We discuss a semiempirical model for this state, which yields an estimate of the effective electric field on the valence electrons in PbO. Our final result is a lower limit on the measurable energy shift, which is significantly larger than was anticipated earlier: 2jW d jd e 2:4 10 25 Hz d e e cm .