Rotationally inelastic collisions between a molecule in a 2S+1Σ electronic state and an open‐shell target: General quantum analysis and experimental measurement of state‐resolved cross sections for CaCl(X 2Σ+)+NO(X 2Σ)

1986 ◽  
Vol 84 (3) ◽  
pp. 1547-1553 ◽  
Author(s):  
Gregory C. Corey ◽  
Millard H. Alexander ◽  
Paul J. Dagdigian
Keyword(s):  
Electronic State ◽  
Cross Sections ◽  
Experimental Measurement ◽  
Open Shell ◽  
Inelastic Collisions ◽  
Quantum Analysis ◽  
General Quantum

Rotationally inelastic collisions of orbitally degenerate molecules; maser action in OH and CH

1979 ◽  
Vol 368 (1732) ◽  
pp. 99-123 ◽  
Keyword(s):  
Low Temperature ◽  
Cross Section ◽  
Cross Sections ◽  
Born Approximation ◽  
Open Shell ◽  
Inelastic Collisions ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
The Cross ◽  
Maser Action

The theory of rotationally inelastic collisions between orbitally degenerate diatomic molecules and open-shell atoms is developed. Because of the orbital degeneracy two or more electronic potential energy surfaces are involved. Matrix elements of the interaction Hamiltonian are given, hyperfine coupling in the diatomic molecule also being included. From these it is apparent th at the parity of the initial Λ -doublet level will influence the inelastic scattering cross section for poles of interaction λ such that λ ≥ 2 Λ .An expression is developed for state-to-state cross sections using the restricted distorted wave Born approximation. A set of branching coefficients is defined which allows the representation of the parity dependence of the cross section in a simple parametric form. The theory is applied to collisional pumping as an excitation mechanism for interstellar maser action of OH and CH through the inversion of Λ -doublet populations. H atoms, H 2 , He, H + and H + 3 are considered as collision partners. Branching coefficients are tabulated for a variety of excitations from the rotational ground states. The sense of the parity dependence of the cross sections arises from the gross features of the interaction potential at medium and long range, and can be deduced using approximate theoretical surfaces or empirical models. An analogy is drawn with the experimental rates of rotational energy transfer in the closely related system H + NH 2 (Ã, 2 A 1 ), which are ca. 10 -9 cm 3 s -1 , and which have been successfully interpreted using the distorted wave Born approximation. These results are used to give qualitative predictions of population inversion in the Λ -doublets of OH, OD and CH in interstellar clouds. We show th at the ground J = 1 ½ doublet, and excited doublets of the F 1 manifold, of OH and OD will be inverted following collisions with H, H 2 and He. The J = 1/2 doublet of the F 2 manifold of OH and OD will be inverted by collisions with the ions H + and H + 3 . In CH low temperature collisions with H atoms will result in inversion of the ground J = 1 ½ doublet. Collisions with H 2 and He at low temperature result in cooling of the doublet. Implications for maser action are briefly discussed.

Integral and differential cross sections for the S(1D)+HD reaction employing the ground adiabatic electronic state

2009 ◽  
Vol 11 (48) ◽  
pp. 11587 ◽  
Author(s):  
H. Yang ◽  
K.-L. Han ◽  
G. C. Schatz ◽  
S.-H. Lee ◽  
K. Liu ◽  
...  
Keyword(s):  
Electronic State ◽  
Cross Sections ◽  
Differential Cross ◽  
Differential Cross Sections

Inelastic collisions at low energies

1969 ◽  
Vol 47 (10) ◽  
pp. 1723-1729 ◽  
Author(s):  
A. Dalgarno
Keyword(s):  
Energy Loss ◽  
Cross Sections ◽  
Low Energy ◽  
Inelastic Collisions ◽  
Low Energies ◽  
Low Energy Electrons ◽  
The Cross ◽  
Loss Rates

A summary is presented of the processes by which low energy electrons lose energy in moving through the atmosphere and estimates are given of the cross sections and energy loss rates. The mechanisms by which thermal electrons cool are described and the cooling efficiencies are listed.

Stresses and Deformations of Toroidal Shells of Elliptical Cross Section: With Applications to the Problems of Bending of Curved Tubes and of the Bourdon Gage

1952 ◽  
Vol 19 (1) ◽  
pp. 37-48
Author(s):  
R. A. Clark ◽  
T. I. Gilroy ◽  
E. Reissner
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Practical Interest ◽  
Closed Shell ◽  
Open Shell ◽  
Elliptical Cross Section ◽  
Axially Symmetric ◽  
Elliptical Cross ◽  
Two Parameters ◽  
Toroidal Shells

Abstract This paper is concerned with the application of the theory of thin shells to several problems for toroidal shells with elliptical cross section. These problems are as follows: (a) Closed shell subjected to uniform normal wall pressure. (b) Open shell subjected to end bending moments. (c) Combination of the results for the first and second problems in such a way as to obtain results for the stresses and deformations in Bourdon tubes. In all three problems the distribution of stresses is axially symmetric but only in the first problem are the displacements axially symmetric. The magnitude of stresses and deformations for given loads depends in all three problems on the magnitude of the two parameters bc/ah and b/c where b and c are the semiaxes of the elliptical section, a is the distance of the center of the section from the axis of revolution, and h is the thickness of the wall of the shell. For sufficiently small values of bc/ah trigonometric series solutions are obtained. For sufficiently large values of bc/ah asymptotic solutions are obtained. Numerical results are given for various quantities of practical interest as a function of bc/ah for the values 2, 1, 1/2, 1/4 of the semiaxes ratio b/c. It is suggested that the analysis be extended to still smaller values of b/c and to cross sections other than elliptical.

scholarly journals Open shell electronic state calculations on quantum computers: A quantum circuit for the preparation of configuration state functions based on Serber construction

2019 ◽  
Vol 1 ◽  
pp. 100002 ◽  
Author(s):  
Kenji Sugisaki ◽  
Satoru Yamamoto ◽  
Shigeaki Nakazawa ◽  
Kazuo Toyota ◽  
Kazunobu Sato ◽  
...  
Keyword(s):  
Electronic State ◽  
Quantum Circuit ◽  
Open Shell ◽  
Quantum Computers ◽  
State Functions

New experimental measurement of Ernat(n,γ) cross sections between 1 and 100 eV

2021 ◽  
Vol 104 (5) ◽  
Author(s):  
X. X. Li ◽  
L. X. Liu ◽  
W. Jiang ◽  
J. Ren ◽  
H. W. Wang ◽  
...  
Keyword(s):  
Cross Sections ◽  
Experimental Measurement

Investigation of rotational state-changing collisions of C2N− ions with helium

2019 ◽  
Vol 15 (S350) ◽  
pp. 443-444
Author(s):  
Jan Franz ◽  
Francesco Antonio Gianturco
Keyword(s):  
Dipole Moment ◽  
Potential Energy ◽  
Potential Energy Surface ◽  
Cross Sections ◽  
Energy Surface ◽  
Inelastic Collisions ◽  
Atomic Gases ◽  
Molecular Anion ◽  
Helium Atoms ◽  
Molecular Anions

AbstractThe cross sections for rotational inelastic collisions between atoms and a molecular anion can be very large, if the anion has a dipole moment. This makes molecular anions very efficient in cooling atomic gases. We address rotational inelastic collisions of Helium atoms with the molecular anion C2N–. Here we present preliminary calculations of the potential energy surface.

Importance of coupling for inelastic collisions between protons and hydrogen atoms

1965 ◽  
Vol 283 (1392) ◽  
pp. 100-114 ◽  
Keyword(s):  
Cross Sections ◽  
Intermediate State ◽  
Relative Velocity ◽  
Inelastic Collisions ◽  
Hydrogen Atoms ◽  
Resonance Reactions ◽  
The Cross ◽  
Good Agreement

The importance of coupling for fast collisions between protons and hydrogen atoms is examined with the two-centred expansion in atomic eigenfunctions proposed by Bates (1958 a ). Cross-sections are evaluated for reactions H + + H (I s ) → H(I s ) + H + , H + + H( I s ) → H(2 s ) + H + , and H + + H(l a ) → H + + H(2 s ). The effect of a single intermediate state, either I s or 2 s , is considered. For the non-resonance processes, it is found that the cross-sections may be substantially increased by passage through intermediate state for incident energies less than about 10 keV, tending towards equality with decrease in relative velocity. Results obtained for the symmetrical resonance reactions are in good agreement with the two-state solutions of McCarroll (1961).

Tuning of Intramolecular π-π Overlap Mode of Tetrathiafulvalene Bisannulated Macrocycles in the Open-Shell Electronic State

2000 ◽  
Vol 29 (2) ◽  
pp. 132-133 ◽  
Author(s):  
Tomoyuki Akutagawa ◽  
Yukako Abe ◽  
Tatsuo Hasegawa ◽  
Takayoshi Nakamura ◽  
Tamotsu Inabe ◽  
...  
Keyword(s):  
Electronic State ◽  
Open Shell
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