Déplacements des raies d'émission de l'ion ArII dans un plasma dense

1982 ◽  
Vol 60 (6) ◽  
pp. 820-824 ◽  
Author(s):  
P. A. Simard
Keyword(s):  
Qualitative Analysis ◽  
Spectroscopic Study ◽  
Electron Density ◽  
Argon Plasma ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Theta Pinch ◽  
First Time ◽  
Very High ◽  
Plasma Effect

A spectroscopic study of the emission from an argon plasma produced by a small theta-pinch is described. The electron density in the plasma is very high and the temperature relatively cool. Values obtained for these quantities are [Formula: see text] and [Formula: see text]. Wavelengths of many ArII lines have been measured between 2700 and 5000 Å. Many of these lines exhibit small shifts to the blue or to the red but others show large red shifts. Particularly significant are the multiplets 4p4P−4d4P, 4p4P−5s4P and 4p4S−4d4P where the measured shifts are about 6.0 ± 0.8 cm−1. These shifts have been interpreted as plasma polarization shifts. A plasma effect on the spin–orbit coupling in ArII has also been observed for the first time. A qualitative analysis of these phenomena is given.

Spin−Orbit Coupling Patterns Induced by Twist and Pyramidalization Modes in C2H4:  A Quantitative Study and a Qualitative Analysis

1998 ◽  
Vol 102 (29) ◽  
pp. 5923-5936 ◽  
Author(s):  
David Danovich ◽  
Christel M. Marian ◽  
Thomas Neuheuser ◽  
Sigrid D. Peyerimhoff ◽  
Sason Shaik
Keyword(s):  
Qualitative Analysis ◽  
Quantitative Study ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit

scholarly journals N3LO gravitational spin-orbit coupling at order G4

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Michèle Levi ◽  
Andrew J. McLeod ◽  
Matthew von Hippel
Keyword(s):  
Effective Field Theory ◽  
Dimensional Regularization ◽  
Effective Field ◽  
Compact Objects ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Transcendental Numbers ◽  
Integration Techniques ◽  
First Time

Abstract In this paper we derive for the first time the N3LO gravitational spin-orbit coupling at order G4 in the post-Newtonian (PN) approximation within the effective field theory (EFT) of gravitating spinning objects. This represents the first computation in a spinning sector involving three-loop integration. We provide a comprehensive account of the topologies in the worldline picture for the computation at order G4. Our computation makes use of the publicly-available EFTofPNG code, which is extended using loop-integration techniques from particle amplitudes. We provide the results for each of the Feynman diagrams in this sector. The three-loop graphs in the worldline picture give rise to new features in the spinning sector, including divergent terms and logarithms from dimensional regularization, as well as transcendental numbers, all of which survive in the final result of the topologies at this order. This result enters at the 4.5PN order for maximally-rotating compact objects, and together with previous work in this line, paves the way for the completion of this PN accuracy.

Electronic Spectrum of the N80Se Molecule in the Region 2840–3200 Å

1971 ◽  
Vol 49 (15) ◽  
pp. 2033-2051 ◽  
Author(s):  
L. Harding ◽  
W. E. Jones ◽  
K. K. Yee ◽  
A. Jenouvrier ◽  
D. Daumont ◽  
...  
Keyword(s):  
Electronic Spectrum ◽  
Ground State ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Rotational Analysis ◽  
Coupling Constant ◽  
Molecular Constants ◽  
First Time

The vibrational and rotational analysis of 12 red degraded bands of N80Se, in the region 2800 to 3200 Å, is reported. These bands are attributed to two progressions, ν′ = 1 and ν′ = 2, of the subsystem C2Δ5/2–X2Π3/2 and to two progressions, ν′ = 0, of the system B2Σ–X2Π(a).Tables of molecular constants of the observed states are given. For the first time it has been possible to calculate the spin–orbit coupling constant, Aeff, of the ground state, X2Π(a).

scholarly journals Probing the coupling of a dipole-bound electron with a molecular core

2019 ◽  
Vol 10 (5) ◽  
pp. 1386-1391 ◽  
Author(s):  
Joseph Czekner ◽  
Ling Fung Cheung ◽  
G. Stephen Kocheril ◽  
Lai-Sheng Wang
Keyword(s):  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Molecular Core ◽  
First Time ◽  
Bound Electron

The spin–orbit coupling of a dipole-bound electron with the neutral core has been studied for the first time.

scholarly journals Classical Spin-Orbit Coupling and Periastron Advance in PSR J0045–7319

1996 ◽  
Vol 160 ◽  
pp. 531-532
Author(s):  
Victoria M. Kaspi
Keyword(s):  
Direct Evidence ◽  
Supernova Explosion ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Classical Spin ◽  
Binary Pulsar ◽  
Angular Momenta ◽  
Orbital Decay ◽  
First Time

AbstractRadio timing observations of the SMC binary pulsar PSR J0045–7319 show, for the first time in a binary pulsar, that classical spin-orbit coupling and periastron advance are occurring. From the observations, the angle θ between the B star spin axis and the orbital angular momentum is constrained to be 25° < θ < 41° (Kaspi et al. 1996b). Under the conventional assumption that the pre-supernova angular momenta were aligned, this provides direct evidence for an asymmetric supernova explosion. In addition, a large, unexpected orbital decay is observed in the system.

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