Broadening of the Fine-Structure Raman Lines in Gaseous Oxygen

1971 ◽  
Vol 26 (10) ◽  
pp. 1639-1643
Author(s):  
S. Hess ◽  
H. F. P. Knaap
Keyword(s):  
Fine Structure ◽  
Relaxation Frequency ◽  
Collision Term ◽  
60 Ghz ◽  
Pressure Broadening ◽  
Gaseous Oxygen ◽  
Molecular Potential ◽  
Electronic Spin ◽  
Anti Stokes ◽  
Rayleigh Light

Abstract Due to the coupling between the rotational angular momentum and the electronic spin, the depolarized Rayleigh light scattered from gaseous oxygen shows Stokes and anti-Stokes satellites shifted by about 60 GHz. The broadening of these fine-structure Raman lines is investigated theoretically for high and medium pressures where the linewidth is determined by two contributions, one proportional and the other inversely proportional to the pressure, p. The linewidth in the pressure broadening region is given by a relaxation frequency which is obtained from the Waldmann-Snider collision term. The p-1 contribution to the linewidth is determined by the ratio of the second moment of the fine-structure freqencies (with respect to the center of the shifted line) and another relaxation frequency. Both relaxation frequencies are sensitive to the nonspherical part of the inter-molecular potential.

scholarly journals Strong spin squeezing induced by weak squeezing of light inside a cavity

Nanophotonics ◽  
2020 ◽  
Vol 9 (16) ◽  
pp. 4853-4868
Author(s):  
Wei Qin ◽  
Ye-Hong Chen ◽  
Xin Wang ◽  
Adam Miranowicz ◽  
Franco Nori
Keyword(s):  
Spin Squeezing ◽  
Nitrogen Vacancy ◽  
Photon Pair ◽  
Cavity Resonance ◽  
Alternative Mechanism ◽  
Simple Method ◽  
Two Photon ◽  
Electronic Spin ◽  
Anti Stokes ◽  
Strong Spin

AbstractWe propose a simple method for generating spin squeezing of atomic ensembles in a Floquet cavity subject to a weak, detuned two-photon driving. We demonstrate that the weak squeezing of light inside the cavity can, counterintuitively, induce strong spin squeezing. This is achieved by exploiting the anti-Stokes scattering process of a photon pair interacting with an atom. Specifically, one photon of the photon pair is scattered into the cavity resonance by absorbing partially the energy of the other photon whose remaining energy excites the atom. The scattering, combined with a Floquet sideband, provides an alternative mechanism to implement Heisenberg-limited spin squeezing. Our proposal does not need multiple classical and cavity-photon drivings applied to atoms in ensembles, and therefore its experimental feasibility is greatly improved compared to other cavity-based schemes. As an example, we demonstrate a possible implementation with a superconducting resonator coupled to a nitrogen-vacancy electronic-spin ensemble.

Theory of Fine Structure Pressure Broadening of Spectral Lines

1954 ◽  
Vol 93 (3) ◽  
pp. 420-424 ◽  
Author(s):  
Makoto Takeo ◽  
Shang-Yi Ch'en
Keyword(s):  
Fine Structure ◽  
Spectral Lines ◽  
Pressure Broadening

Temperature dependence of pressure broadening of the N=1− fine structure oxygen line at 118.75GHz

2007 ◽  
Vol 241 (1) ◽  
pp. 109-111 ◽  
Author(s):  
M.Yu. Tretyakov ◽  
M.A. Koshelev ◽  
I.A. Koval ◽  
V.V. Parshin ◽  
L.M. Kukin ◽  
...  
Keyword(s):  
Fine Structure ◽  
Temperature Dependence ◽  
Pressure Broadening

scholarly journals Spectrum of the Depolarized Rayleigh Light Scattered by Gases of Linear Molecules

1970 ◽  
Vol 25 (3) ◽  
pp. 350-362 ◽  
Author(s):  
Siegfried Hess
Keyword(s):  
Line Width ◽  
Magnetic Relaxation ◽  
Scattering Amplitude ◽  
Collision Term ◽  
Theory Approach ◽  
Molecular Scattering ◽  
Relaxation Measurements ◽  
Linear Molecules ◽  
Relaxation Coefficients ◽  
Rayleigh Light

The spectrum of the depolarized Rayleigh light scattered by a gas of linear molecules is calculated by a kinetic theory approach based on the Waldman-Snider equation. Collisional and diffusional broadening are studied. The line width is related to relaxation coefficients which are collision brackets obtained from the linearized Waldmann-Snider collision term involving the binary molecular scattering amplitude and its adjoint. It is shown under which conditions the relaxation coefficients characterizing the line width can be compared with data obtained from Sentfleben- Beenakker effect and nuclear magnetic relaxation measurements

scholarly journals Pressure broadening and fine-structure-dependent predissociation in oxygen BΣu−3, v=0

2005 ◽  
Vol 123 (17) ◽  
pp. 174318 ◽  
Author(s):  
Sandro Hannemann ◽  
GuoRong Wu ◽  
Eric-Jan van Duijn ◽  
Wim Ubachs ◽  
Philip C. Cosby
Keyword(s):  
Fine Structure ◽  
Pressure Broadening

scholarly journals IV. The triplets of helium

1929 ◽  
Vol 228 (659-669) ◽  
pp. 151-196 ◽  
Keyword(s):  
Perturbation Theory ◽  
Fine Structure ◽  
Energy Levels ◽  
Wave Functions ◽  
The Other ◽  
Recent Theory ◽  
Spin Effects ◽  
Electronic Spin ◽  
Fundamental Equations ◽  
Good Agreement

Heisenberg’s theory of the helium atom, following his famous principle of “resonance,” accounted satisfactorily for the ortho- and para- states. His more detailed treatment of the triplets, besides giving ground for minor criticisms, necessarily had to be derived from Schrödinger’s equation , with a somewhat incongruous electronic “spin” grafted upon it. The present work uses Dirac’s recent theory, in which the spin effects grow more naturally from the fundamental equations. Calculations which are in dependent of the spin, such as the approximate energy-levels and the ortho-para separations, are the same on either theory. We deal here with spin effects, such as the fine structure of the triplets and intercombinations between ortho- and para- states. The fundamental equations, the perturbation theory which is used, and the perturbing spin energy, have been discussed fully elsewhere. The present paper, after a short recapitulation of the general theory, gives in detail the calculations whose results alone were quoted in the other. §§ 4–7 work out the structure of the helium triplets with one excited election. The resulting spin separations are different from Heisenberg’s, but in equally good agreement with experiment. At the same time, the correct first approximations to the wave-functions are found, and they are used in § 8 to verify the ordinary classification and selection rules.

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