The effect of collisions on the rotational angular momentum of diatomic molecules studied using polarized light

2020 ◽  
Vol 153 (18) ◽  
pp. 184310
Author(s):  
P. T. Arndt ◽  
J. Huennekens ◽  
C. Packard ◽  
V. Tran ◽  
J. Carey ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Diatomic Molecules ◽  
Polarized Light ◽  
Rotational Angular Momentum

Modified Dunham potential for rovibrational diatomic systems

1995 ◽  
Vol 73 (1-2) ◽  
pp. 59-62 ◽  
Author(s):  
Marcin Molski ◽  
Jerzy Konarski
Keyword(s):  
Angular Momentum ◽  
Quantum Number ◽  
Standard Method ◽  
Diatomic Molecules ◽  
Rotational Quantum Number ◽  
Electronic States ◽  
Rotational States ◽  
Diatomic Systems ◽  
Rovibrational States ◽  
Rotational Angular Momentum

A modified Dunham potential with parameters depending on the rotational quantum number is employed to describe the rovibrational states of diatomic molecules. This approach, applied to H81Br, 115InD, 7LiH, and 40Ar2, gives satisfactory reproduction of the observed transitions using fewer Dunham parameters than in the standard method. The results obtained indicate the possibility of introducing the local internal potentials, which, in contradiction to the global ones usually used, depend on the rotational states of a rotating–vibrating molecule. Such a J dependence may be a result of rovibronic interactions, in particular, Coriolis-type nonadiabatic interactions coupling other electronic states through the rotational angular momentum.

Rotational Angular Momentum Dependence of the Scattering Amplitude for Elastic Molecular Collisions

1968 ◽  
Vol 23 (12) ◽  
pp. 1903-1911 ◽  
Author(s):  
S. Hess ◽  
W. E. Köhler
Keyword(s):  
Angular Momentum ◽  
Interaction Potential ◽  
Scattering Amplitude ◽  
Diatomic Molecules ◽  
Spin Operator ◽  
Potential Functions ◽  
Momentum Dependence ◽  
Starting Point ◽  
Spin Tensors ◽  
Rotational Angular Momentum

The rotational angular momentum (spin) dependence of the binary scattering amplitude operator is investigated for elastic collisions of homonuclear diatomic molecules with monatomic and diatomic particles. Starting point is a formal expansion of the T-matrix (and consequently of the scattering amplitude) with respect to the nonsphericity parameter ε which essentially measures the ratio of the nonspherical and spherical parts of the interaction potential. A transscription of angle dependent potential functions into a spin operator notation is introduced. Potential functions and values for ε may be inferred from the data available in the literature for the interactions: H2—He (ε ≈ 1/4) and H2—H2 (ε ≈ 1/20). As far as elastic events are concerned, irreducible spin tensors of even rank only occur with the interaction potential and consequently with the scattering amplitude in order ε. The most important terms of the scattering amplitude of diatomic molecules are quadratic in the spins. These terms are discussed in detail. In order ε2 the scattering amplitude also contains irreducible spin tensors of odd rank. A knowledge of the orders of magnitude of the various spin — dependent terms is of interest for the SENFTLEBEN-BEENAKKER effect and for NMR in polyatomic gases.

Waldmann-Snider Collision Integrals and Nonspherical Molecular Interaction. I. Collision Integrals for Pure Gases

1974 ◽  
Vol 29 (12) ◽  
pp. 1705-1716 ◽  
Author(s):  
W. E. Köhler
Keyword(s):  
Angular Momentum ◽  
Cross Sections ◽  
Molecular Interaction ◽  
Scattering Amplitude ◽  
Collision Operator ◽  
Positive Definiteness ◽  
Collision Integrals ◽  
General Properties ◽  
Relaxation Coefficients ◽  
Rotational Angular Momentum

Collision integrals of the linearized Waldmann-Snider collision operator for pure gases are defined. General properties due to invariances of the molecular interaction are discussed. Effective cross sections are introduced and expressed in terms of convenient bracket symbols. The positive definiteness of the relaxation coefficients is proved. The approximation of small nonsphericity for the scattering amplitude is explained and consequences for the collision integrals are investigated. Molecular cross sections describing the orientation and reorientation of the molecular rotational angular momentum are defined. Expressions for effective cross sections relevant for the various nonequilibrium alignment phenomena are presented.

JACOBI BIFURCATION IN HOT ROTATING NUCLEI WITH A LSD + YUKAWA FOLDED APPROACH

2009 ◽  
Vol 18 (04) ◽  
pp. 986-995 ◽  
Author(s):  
JOHANN BARTEL ◽  
BOZENA NERLO-POMORSKA ◽  
KRZYSZTOF POMORSKI
Keyword(s):  
Angular Momentum ◽  
Nuclear Energy ◽  
Nuclear Temperature ◽  
The Stability ◽  
Rotational Angular Momentum ◽  
Rotating Nuclei

The "Modified Funny-Hills parametrisation" is used together with the Lublin-Strasbourg Drop Model and Strutinsky type shell corrections to determine the stability of hot rotating nuclei. Both the macroscopic and the microscopic part of the nuclear energy are evaluated by taking into account their dependence on the nuclear temperature and the rotational angular momentum. The Jacobi transition into triaxial shapes and the centrifugal-fission instability are studied.

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