scholarly journals Спин-обменное уширение магнитного M-=SUB=-X-=/SUB=--резонанса в цезии

2021 ◽  
Vol 47 (8) ◽  
pp. 51
Author(s):  
А.К. Вершовский ◽  
С.П. Дмитриев ◽  
М.В. Петренко
Keyword(s):  
Magnetic Resonance ◽  
Cross Section ◽  
Ground State ◽  
Resonance Line ◽  
Measurement Errors ◽  
Spin Exchange ◽  
The Cross ◽  
Exchange Broadening

The paper presents the results of measuring the cross section of the spin-exchange broadening of the magnetic resonance line in the Zeeman structure of the ground state of cesium. The analysis of the influence of measurement errors of parameters on the result was carried out, the values of the concentration of cesium vapors were refined by independent measurements.

scholarly journals Столкновения с участием поляризованных щелочных атомов цезия и лития

2020 ◽  
Vol 128 (4) ◽  
pp. 483
Author(s):  
В.А. Картошкин
Keyword(s):  
Magnetic Resonance ◽  
Frequency Shift ◽  
Temperature Dependence ◽  
Cross Section ◽  
Cross Sections ◽  
Ground State ◽  
Resonance Line ◽  
Spin Exchange ◽  
Interaction Potentials ◽  
The Real

The cross section and frequency shift of the magnetic resonance line for the spin exchange are calculated for a collision of lithium and cesium atoms in the ground state. The calculation was carried out on the basis of data on the singlet (X1Sigma+) and triplet (a3Sigma+) interaction potentials of the 7Li133Cs dimer. The transfer from the energy to the temperature dependence of the real and imaginary parts of the complex cross sections for a spin exchange allows us to obtain information both the broadening of the magnetic resonance line of the atoms under study and the frequency shift of the magnetic resonance upon their collision.

scholarly journals Cross Section Ionization By Electron Impact Of Helium Like Ions

2021 ◽  
Author(s):  
Manel Hariz Belgacem ◽  
Elhabib Guedda ◽  
Haikel Jelassi
Keyword(s):  
Electron Impact ◽  
Cross Section ◽  
Cross Sections ◽  
Ground State ◽  
The Cross ◽  
State 1 ◽  
Unstable States ◽  
Good Agreement

<sub></sub> In this paper we present our calculation of the cross section ionization by electron impact of C V, N VI and O VII. Using the Flexible Atomic Code (FAC), we obtain the cross sections for the ionization of these ions from the ground state 1<sup>1</sup>S, and from the unstable states 2<sup>1</sup>S and 2<sup>3</sup>S. Our results are in good agreement with those based on the Coulomb Born (CB) approximation and the available measurements.

scholarly journals Spin exchange broadening of magnetic resonance lines in a high-sensitivity rotating K-Rb-21Ne co-magnetometer

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Yao Chen ◽  
Wei Quan ◽  
Sheng Zou ◽  
Yan Lu ◽  
Lihong Duan ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Spin Exchange ◽  
High Sensitivity ◽  
Exchange Broadening

scholarly journals 158 Dormancy of Ornithogalum Evaluated by Nuclear Magnetic Resonance Imaging

HortScience ◽  
2000 ◽  
Vol 35 (3) ◽  
pp. 417B-417
Author(s):  
M.S. Roh ◽  
M. Line ◽  
Y.H. Joung ◽  
P. Brannigan
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Cross Section ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Inflorescence Development ◽  
Leaf Emergence ◽  
The Cross ◽  
Nuclear Magnetic

Ornithogalum hybrid bulbs (selection 327-2) were stored dry at 10, 16, 22, 28, and 35 °C for 6 weeks upon harvest. After storage, bulbs were subjected to a nuclear magnetic resonance (NMR) imaging to obtain the longitudinal spin-lattice relaxation time (T1) profile across the cross section of intact bulbs and to a scanning electron microscopy (SEM) to observe an inflorescence development. Bulbs were forced in a greenhouse maintained at 21/19 °C. When bulbs were stored at 10, T1 was shorter through the cross section of bulbs and the shoot apex was under a vegetative stage. This suggests that dormancy was not broken during the storage, leaf emergence was delayed, and plants failed to flower. Bulbs stored at 22 and 28 °C formed the primary scape and inflorescence with several florets. At the base of the primary scape of bulbs stored at 22 °C, a vegetative apex was observed by both MR imaging (MRI) and SEM. In the center of bulbs where leaves and floral organs were present, T1 was longer as compared to the scales. This suggests that dormancy in the scales was broken and the leaves and scape were ready to emerge. Leaf emergence and flowering was the fastest when bulbs were stored at 22 °C and at 16 or 22 °C, respectively. Due to its nondestructive nature, MRI can be used to study the state of bulb dormancy and also the progress of inflorescence development during bulb storage prior to planting.

Excitation de l'argon par impact électronique entre 43 et 60 eV

1975 ◽  
Vol 53 (21) ◽  
pp. 2438-2444 ◽  
Author(s):  
P. Marmet ◽  
E. Bolduc ◽  
J. J. Quémener
Keyword(s):  
Electron Impact ◽  
Cross Section ◽  
Ground State ◽  
Quadratic Function ◽  
Double Ionization ◽  
The Cross ◽  
Ionic States

This work reports numerous atomic levels of Ar observed between 43.38 and 60 eV above the ground state of Ar I. These levels, until now undetected, produce weak perturbations on the double ionization curve obtained by electron impact. The cross section near this Ar++ threshold varies very nearly as a quadratic function. Most of the reported levels of argon have the configuration 3s3p54l 4l′. Ionic states are also responsible for some of these structures.

Ground-state and isomeric-state cross-sections for 92Mo(n,α)89Zr and 95Mo(n,p)95Nb reactions in the 13–15 MeV energy region

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Junhua Luo ◽  
Li Jiang
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Ground State ◽  
Nuclear Decay ◽  
Excitation Functions ◽  
Total Cross Sections ◽  
Γ Ray ◽  
Simulation Results ◽  
The Cross ◽  
Isomeric Ratios

Abstract The (n,α) and (n,p) cross-sections and their isomeric ratios (σ m /σ g ) were measured at 13–15 MeV for 92Mo and 95Mo by activation and off-line γ-ray spectrometry. The activated Mo samples combined with Al foils were used to obtain the cross-section values and the neutron flux, generated using the 3H(d,n)4He reaction. The cross-sections of the ground states were obtained using the metastable state absolute cross-sections and the residual nuclear decay rule. The excitation functions, total cross-sections, and isomeric ratios for the 92Mo(n,α)89m,gZr and 95Mo(n,p)95m,gNb reactions were calculated using the TALYS-1.95 software. 92Mo(n,α)89m + gZr and 95Mo(n,p)95m + gNb reaction excitation functions were obtained using the EMPIRE-3.2.3 package. These simulation results were compared with the corresponding experimental data and with the evaluated data from the ENDF/B-VIII.0, JEFF-3.3, CENDL-3, and ROSFOND libraries. Only partial agreements were observed.

Possible structure dependence in the Al reaction

1979 ◽  
Vol 57 (11) ◽  
pp. 1949-1951 ◽  
Author(s):  
M. A. M. Shahabuddin ◽  
J. C. Waddington
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Ground State ◽  
Angular Distributions ◽  
Structure Dependence ◽  
Analyzing Powers ◽  
The Cross ◽  
Back Angle ◽  
Analyzing Power

In the [Formula: see text] Al reaction at Ep = 17.0 MeV, the cross section and analyzing power angular distributions for several Jπ = 5/2+ states are found to be quite different. Except for the ground state, neither the back angle cross sections nor the analyzing powers for these states can be reproduced by cluster DWBA or CCBA calculations. It is thus inferred that this might be due to the dependence of the reaction on the structure of these states.

scholarly journals Charge Exchange Collisions Involving Multielectron Atoms (Lithium and Sodium)

1968 ◽  
Vol 21 (6) ◽  
pp. 793 ◽  
Author(s):  
JG Lodge ◽  
RM May
Keyword(s):  
Excited State ◽  
Cross Section ◽  
Charge Exchange ◽  
Correction Factor ◽  
Ground State ◽  
Hydrogen Atoms ◽  
Sodium Atoms ◽  
The Cross ◽  
Multielectron Atoms

The cross section for forming both ground state and excited state hydrogen atoms by charge exchange between protons and lithium or sodium atoms is calculated. These calculations are performed using the Brinkman-Kramers approximation along with a multiplicative correction factor; the target lithium and sodium atoms are first described by simple "effective-Z" wavefunctions, and then the lithium case is treated more accurately both by including the inner electrons and by using a more accurate numerical lithium wavefunction.

Sensitized Fluorescence in Cadmium Induced in Collisions with Excited Hg Atoms

1974 ◽  
Vol 52 (22) ◽  
pp. 2228-2234 ◽  
Author(s):  
M. Czajkowski ◽  
L. Krause
Keyword(s):  
Excitation Energy ◽  
Cross Section ◽  
Ground State ◽  
Inelastic Collisions ◽  
Low Density ◽  
Resonance Fluorescence ◽  
Vapor Mixture ◽  
Sensitized Fluorescence ◽  
Fluorescence Measurements ◽  
The Cross

The transfer of excitation energy induced in inelastic collisions between excited Hg atoms and ground-state Cd atoms was studied using methods of sensitized fluorescence. Hg atoms in a low-density Hg–Cd vapor mixture were excited with Hg 2537 Å resonance radiation to the 63P1 state and interacted with the Cd atoms which became collisionally excited to the 53P1 state and subsequently decayed emitting sensitized fluorescence. Measurements of relative intensities of Hg 2537 Å resonance fluorescence and Cd 3261 Å sensitized fluorescence yielded the cross section Q(63P1 → 53P1) = 4.6 × 10−2 Å2. The efficiency of the excitation transfer was enhanced by the addition of small quantities of N2 to the Hg–Cd system. The cross section for quenching of the Cd 53P1 state by collisions with N2 was found to be 1.7 Å2.

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