scholarly journals Collisional “Selection Rules” for Asymmetric Top Molecules

1977 ◽  
Vol 32 (6) ◽  
pp. 614-619 ◽  
Author(s):  
W. Schrepp ◽  
H. Mäder ◽  
H. Dreizler ◽  
D. Sutter
Keyword(s):  
Double Resonance ◽  
Order Perturbation ◽  
Microwave Range ◽  
Selection Rules ◽  
First Order ◽  
Asymmetric Top ◽  
Rotational Transitions ◽  
Theoretical Results ◽  
First Order Perturbation

Abstract Selection rules for collision-induced rotational transitions of asymmetric top molecules are derived by first order perturbation treatment. The theoretical results are in agreement with the results from four-level double resonance experiments in the microwave range.

scholarly journals WHICH CAUSALITY? DIFFERENCES BETWEEN TRAJECTORY AND COPENHAGEN ANALYSES OF AN IMPULSIVE PERTURBATION

1999 ◽  
Vol 14 (07) ◽  
pp. 1111-1124 ◽  
Author(s):  
EDWARD R. FLOYD
Keyword(s):  
Wave Function ◽  
Ground State ◽  
Temporal Change ◽  
Order Perturbation ◽  
First Order ◽  
Trajectory Representation ◽  
Square Well ◽  
Impulsive Perturbations ◽  
Theoretical Results ◽  
First Order Perturbation

The trajectory and Copenhagen representations render different predictions for impulsive perturbations. The different predictions are due to the different roles that causality plays in the trajectory and Copenhagen interpretations. We investigate a small perturbing impulse acting on the ground state of an infinitely deep square well. For the two representations, the first-order perturbation calculations for the temporal change in energy differ. This temporal change in energy for the trajectory representation is dependent upon the microstate of the wave function. We show that even under Copenhagen epistemology, the two representations predict different theoretical results.

Note on Interference Effects in Two-Step Reaction Processes

1975 ◽  
Vol 53 (23) ◽  
pp. 2590-2592
Author(s):  
J. Cejpek ◽  
J. Dobeš
Keyword(s):  
Perturbation Theory ◽  
Point Of View ◽  
Order Perturbation ◽  
Interference Effects ◽  
Qualitative Explanation ◽  
First Order ◽  
One Step ◽  
Step Transition ◽  
Reaction Processes ◽  
First Order Perturbation

The reaction processes in which a one-step transition is forbidden are analyzed from the point of view of the first order perturbation theory. The interference between two competing two-step reaction paths is found to be always constructive. A qualitative explanation of the experimentally observed reaction intensities is presented.

Analysis of Pneumatic Instability of Externally Pressurized Porous Gas Journal Bearings

1979 ◽  
Vol 101 (1) ◽  
pp. 48-53 ◽  
Author(s):  
N. S. Rao ◽  
B. C. Majumdar
Keyword(s):  
Theoretical Analysis ◽  
Mass Parameter ◽  
Journal Bearings ◽  
Order Perturbation ◽  
Rigid Rotor ◽  
Eccentricity Ratio ◽  
Dynamic Displacement ◽  
First Order ◽  
Supply Pressure ◽  
First Order Perturbation

A theoretical analysis is presented for the study of pneumatic instability for a rigid rotor supported in externally pressurized porous gas journal bearings. The analysis is based on a first-order perturbation with respect to the amplitude of dynamic displacement of rotor. The variation of threshold mass parameter with feeding parameter is shown. In addition, the effects of supply pressure, eccentricity ratio, L/D ratio, and porosity parameter are investigated and presented in the form of graphs.

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