A unified description of spectroscopic interferences in predissociation

1977 ◽  
Vol 55 (1) ◽  
pp. 1-22 ◽  
Author(s):  
Jean-Pierre Laplante ◽  
André D. Bandrauk ◽  
Cosmo Carlone
Keyword(s):  
General Theory ◽  
Cross Sections ◽  
Scattering Theory ◽  
Bound States ◽  
Total Absorption ◽  
Photon Scattering ◽  
Simple Method ◽  
Complex Eigenvalues ◽  
Unified Description

A general theory of spectroscopic interferences for predissociating systems is developed using scattering theory. The introduction of complex bound states with complex eigenvalues results in a simple method for the derivation of total absorption, predissociation, and photon scattering (Raman) cross sections. The validity of other formalisms for these interferences, including Fano lineshapes, is examined and cases of spectroscopic interest are pointed out.

Ionization yields, total absorption, and dissociative photoionization cross sections of CH4 from 110 to 950 Å

1989 ◽  
Vol 90 (12) ◽  
pp. 6925-6932 ◽  
Author(s):  
James A. R. Samson ◽  
G. N. Haddad ◽  
T. Masuoka ◽  
P. N. Pareek ◽  
D. A. L. Kilcoyne
Keyword(s):  
Cross Sections ◽  
Total Absorption ◽  
Dissociative Photoionization

Reaction rate of n12C radiative capture at temperature from 0.01 to 10 T9

2021 ◽  
pp. 142-148
Author(s):  
S.B. Dubovichenko ◽  
◽  
N.A. Burkova ◽  
R.R. Shamitova ◽  
◽  
...  
Keyword(s):  
Cross Sections ◽  
Cluster Model ◽  
Bound States ◽  
Reaction Rate ◽  
Applied Research ◽  
Radiative Capture ◽  
Potential Cluster Model ◽  
Total Cross Sections ◽  
Forbidden States ◽  
Wide Resonance

Within the framework of a modified potential cluster model with forbidden states, radiation n12C capture at energies from 10-5 keV to 5 MeV is considered, taking into account a wide resonance at Ex = 8.2 MeV. It is shown that on the basis of potentials that are consistent with the energies of the bound states, it is possible to correctly transfer the available experimental data. Based on the obtained total cross sections, the n12C capture reaction rate was calculated. The results for reaction rate are approximated by simple expressions, which simplifies their use in applied research.

Über das Dissoziationsgleichgewicht realer Gase

1966 ◽  
Vol 21 (3) ◽  
pp. 252-255
Author(s):  
H. Koppe ◽  
G. Spies
Keyword(s):  
Cross Sections ◽  
Bound States ◽  
Exact Expression ◽  
Mass Action ◽  
Quantum Mechanical ◽  
Law Of Mass Action ◽  
Vibrational States ◽  
Degree Of Dissociation ◽  
Atom Scattering ◽  
Collision Approximation

The quantum mechanical cluster expansion, when applied to the partition function of a gas consisting of atoms whose bound states are the rotational and vibrational states of diatomic molecules, provides an exact expression for the degree of dissociation. The approximation containing only the second cluster integral is shown to be identical with the law of mass action involving the binary collision approximation for the activity coefficient of the dissociated constituent. This coefficient can be calculated from the phase shifts and thus from the cross sections of the elastic atom-atom-scattering.

High energy photoionization of bound systems

2020 ◽  
Vol 35 (03) ◽  
pp. 2040021
Author(s):  
E. G. Drukarev ◽  
A. I. Mikhailov
Keyword(s):  
Cross Sections ◽  
Bound States ◽  
Wave Equations ◽  
High Energy ◽  
Central Field ◽  
Model Potentials

We demonstrate how the nonrelativistic high energy asymptotics for the photoionization cross sections of systems bound by a central field can be obtained without solving the wave equations. The earlier analysis carried out for s bound states is extended for p states. We show that the physically expected asymptotics for ionization of fullerenes is not reproduced by the model potentials employed nowadays.

Photoelectric cross sections derived from the total absorption cross sections in the energy range 5–130 keV

1979 ◽  
Vol 57 (1) ◽  
pp. 92-98 ◽  
Author(s):  
K. S. Puttaswamy ◽  
Ramakrishna Gowda ◽  
B. Sanjeevaiah
Keyword(s):  
Energy Range ◽  
Cross Sections ◽  
Proportional Counter ◽  
Atomic Data ◽  
Total Absorption ◽  
Absorption Cross ◽  
Total Cross Sections ◽  
Scattering Cross ◽  
Data Tables ◽  
Scattering Cross Sections

Total absorption cross sections in the elements C, Al, S, Cu, Zr, Ag, Sn, Ta, Au, and Pb for photons of energies 5.0, 5.9, 6.4, 8.1, 10.6, 14.4, 24.7, 32.9, 36.9, 66.6, and 129 keV are measured using a krypton-filled proportional counter in the energy range 5 to 25 keV and a thin NaI(Tl) detector in the energy range 30 to 130 keV. The measured total absorption cross sections are compared with those of Miller and Greening and McCrary, Plassman, Paekett, Conner, and Zimmermann. The scattering cross sections obtained by interpolation using the Atomic Data Tables are subtracted from the total cross sections to obtain the photoelectric cross sections and these are further compared with the recent theoretical values of Scofield.

scholarly journals Ultrastrong Coupling Few-Photon Scattering Theory

2018 ◽  
Vol 120 (15) ◽  
Author(s):  
Tao Shi ◽  
Yue Chang ◽  
Juan José García-Ripoll
Keyword(s):  
Scattering Theory ◽  
Photon Scattering
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