Infrared radiative decay constants for the vibrational levels of CO  (a 3Π)

1977 ◽  
Vol 66 (1) ◽  
pp. 351-354 ◽  
Author(s):  
P. J. Marcoux ◽  
L. G. Piper ◽  
D. W. Setser
Keyword(s):  
Radiative Decay ◽  
Decay Constants ◽  
Vibrational Levels

Mechanism for decay and spontaneous radiative decay constants of the lowest‐lying attractive excited states of Ne2, Ar2, and Kr2

1974 ◽  
Vol 61 (11) ◽  
pp. 4740-4746 ◽  
Author(s):  
T. Oka ◽  
K. V. S. Rama Rao ◽  
J. L. Redpath ◽  
R. F. Firestone
Keyword(s):  
Excited States ◽  
Radiative Decay ◽  
Decay Constants

Substituent positional effect on radiative lifetimes of anthracene sulphonates

1980 ◽  
Vol 58 (10) ◽  
pp. 1046-1050 ◽  
Author(s):  
A. K. Gupta ◽  
Sekhar Basu ◽  
K. K. Rohatgi-Mukherjee
Keyword(s):  
Sharp Increase ◽  
Decay Constant ◽  
Radiative Decay ◽  
Steric Effect ◽  
Single Photon ◽  
Photon Counting ◽  
Molecular Geometry ◽  
Single Photon Counting ◽  
Decay Constants ◽  
Exciplex Formation

Excited state lifetimes of anthracene-1-sulphonate, anthracene-2-sulphonate, anthracene-1,5-disulphonate, and anthracene-1,8-disulphonate have been studied by photoselection and single photon counting methods. Experimental lifetimes are compared with theoretical values. For anthracene- monosulphonates, exciplex formation with water is proposed. In the case of anthracene-1,8-disulphonate, distortion in molecular geometry is found responsible for the higher non-radiative decay constant. Summation of nonradiative decay constants, Σki, increase in the series [Formula: see text]. The sharp increase for 1,8-AS is perhaps due to distortion of the molecular geometry due to steric effect of two bulky and charged —SO3− groups on the same side of the anthracene skeleton.

Radiative decay constants of the H2 Fulcher bands

1978 ◽  
Vol 69 (12) ◽  
pp. 5518-5520 ◽  
Author(s):  
Ray L. Day ◽  
Richard J. Anderson ◽  
Francis A. Sharpton
Keyword(s):  
Radiative Decay ◽  
Decay Constants

scholarly journals Radiative Decay Widths of Ground and Excited States of Vector Charmonium and Bottomonium

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Hluf Negash ◽  
Shashank Bhatnagar
Keyword(s):  
Mass Spectrum ◽  
Excited States ◽  
Mass Spectra ◽  
Reasonable Agreement ◽  
Radiative Decay ◽  
Decay Constants ◽  
Two Photon ◽  
Quantum Numbers ◽  
Decay Widths ◽  
Input Parameters

We study the radiative decay widths of vector quarkonia for the process of J/ψ(nS)→ηc(nS)γ and Υ(nS)→ηb(nS)γ (for principal quantum numbers n=1,2,3) in the framework of Bethe-Salpeter equation under the covariant instantaneous ansatz using a 4×4 form of BSE. The parameters of the framework were determined by a fit to the mass spectrum of ground states of pseudoscalar and vector quarkonia, such as ηc, ηb, J/ψ, and Υ. These input parameters so fixed were found to give good agreements with data on mass spectra of ground and excited states of pseudoscalar and vector quarkonia, leptonic decay constants of pseudoscalar and vector quarkonia, two-photon decays, and two-gluon decays of pseudoscalar quarkonia in our recent paper. With these input parameters so fixed, the radiative decay widths of ground (1S) and excited (2S,3S) states of heavy vector quarkonia (J/Ψ and Υ) are calculated and found to be in reasonable agreement with data.

scholarly journals Poincaré-covariant quark model of electroweak light mesons decays

2019 ◽  
Vol 204 ◽  
pp. 08006 ◽  
Author(s):  
Viktor Andreev ◽  
Vadzim Haurysh
Keyword(s):  
Quantum Mechanics ◽  
Vector Meson ◽  
Quark Model ◽  
Radiative Decay ◽  
Mixing Angles ◽  
Decay Constants ◽  
Point Form ◽  
Experimental Decay ◽  
Invariant Quantum ◽  
Covariant Quark Model

The procedure for obtaining the radiative decay constants of pseudoscalar and vector unflavored mesons in point–form of Poincaré-invariant quantum mechanics is presented. In the course of the work the authors determine the remaining parameters from V → Pγ and P → Vγ experimental decay value, using the obtained earlier parameters of the model for light (u, d and s) quarks. As a result, the mixing angles for pseudoscalar and vector meson sector were obtained taking into account gluonium content for η – η′ meson sector.

Radiative decay rates from deperturbed v=0–7 vibrational levels of CO A 1Π measured using synchrotron radiation

1983 ◽  
Vol 78 (6) ◽  
pp. 2838-2846 ◽  
Author(s):  
R. W. Field ◽  
O. Benoist d’Azy ◽  
M. Lavollée ◽  
R. Lopez‐Delgado ◽  
A. Tramer
Keyword(s):  
Synchrotron Radiation ◽  
Radiative Decay ◽  
Decay Rates ◽  
Vibrational Levels

Energy dependence of the radiative and non-radiative decay constants of the S1 fluorescence of pyrene vapour

1975 ◽  
Vol 32 (2) ◽  
pp. 328-331 ◽  
Author(s):  
C.J. Werkhoven ◽  
T. Deinum ◽  
J. Langelaar ◽  
R.P.H. Rettschnick ◽  
J.D.W. van Voorst
Keyword(s):  
Energy Dependence ◽  
Radiative Decay ◽  
Decay Constants

scholarly journals Dalitz Decays of Unflavored Mesons in the Poincaré Covariant Quark Model

2019 ◽  
Vol 64 (6) ◽  
pp. 451 ◽  
Author(s):  
V. Yu. Haurysh ◽  
V. V. Andreev
Keyword(s):  
Experimental Data ◽  
Quark Model ◽  
Decay Constant ◽  
Radiative Decay ◽  
Vector Mesons ◽  
Mixing Angles ◽  
Decay Constants ◽  
S Quarks ◽  
Point Form ◽  
Covariant Quark Model

The procedure for obtaining the radiative decay constants of pseudoscalar and vector unflavored mesons in the point-form of PiQM is presented. Based on the obtained earlier parameters of the model for light (u, d, s) quarks, we obtain the remaining parameters from the experiments on the V → Py and P → Vy decays. As a result, the mixing angles for pseudoscalar and vector mesons and the behavior of the V → Pℓ+ℓ− decay constant are obtained in agreement with modern experimental data.

scholarly journals Cross sections for the two-step radiative decay process $$X(v)\rightarrow A(v^{\prime \prime })\rightarrow X(v^\prime )$$ in e-LiH collisions

2021 ◽  
Vol 75 (5) ◽  
Author(s):  
Roberto Celiberto ◽  
Annarita Laricchiuta
Keyword(s):  
Cross Sections ◽  
Ground State ◽  
Radiative Decay ◽  
Electronic Excitation ◽  
Vibrational Excitation ◽  
Incident Electron Energy ◽  
Step Process ◽  
Vibrational Levels ◽  
Electronic Ground ◽  
The Continuum

Abstract The cross sections for the two-step process, represented by the electron-impact vibro-electronic excitation $$X^1\varSigma ^+(v) \rightarrow A^1\varSigma ^+(v'')$$ X 1 Σ + ( v ) → A 1 Σ + ( v ′ ′ ) of the LiH molecule, followed by radiative decay back on the vibrational manifold of the ground state, $$A^1\varSigma ^+(v'')\rightarrow X^1\varSigma ^+(v')$$ A 1 Σ + ( v ′ ′ ) → X 1 Σ + ( v ′ ) , are calculated as a function of the incident electron energy from the threshold to 1000 eV. The final cross sections for the two-step process, which results in an overall vibrational excitation of the molecule, known also as E-v process, are provided for all the possible $$v,v'$$ v , v ′ transitions among the vibrational levels, including the continuum, of the electronic ground state. Graphic abstract

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