scholarly journals Reorientierung des Drehimpulses von Li2-Molekülen beim Stoß mit Edelgasatomen / Reorientation of the Angular Momentum of Li2-Molecules due to Collisions with Noble Gas Atoms

1976 ◽  
Vol 31 (7) ◽  
pp. 739-747 ◽  
Author(s):  
J. Bormann ◽  
D. Poppe
Keyword(s):  
Angular Momentum ◽  
Classical Theory ◽  
Noble Gas ◽  
Laser Induced Fluorescence ◽  
Inelastic Collisions ◽  
Rare Gas ◽  
Collision Partner ◽  
Gas System

AbstractLaser-induced fluorescence has been used to investigate the reorientation of the molecular angular momentum due to inelastic collisions with atoms. We report on experiments for the Li2 (1IIu)-rare gas system, where the degree of polarisation of the emitted fluorescence has been measured. Within the framework of a classical theory mean angles for reorientation have been derived. Their dependence on the collision partner and the initial and final angular momentum is discussed.

scholarly journals Breakdown of energy transfer gap laws revealed by full-dimensional quantum scattering between HF molecules

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Dongzheng Yang ◽  
Jing Huang ◽  
Xixi Hu ◽  
Hua Guo ◽  
Daiqian Xie
Keyword(s):  
Energy Transfer ◽  
Angular Momentum ◽  
Vibrational Energy ◽  
Energy Gap ◽  
Inelastic Collisions ◽  
Rate Coefficients ◽  
Quantum Scattering ◽  
Final States ◽  
Energy Gap Law ◽  
Quantitative Basis

Abstract Inelastic collisions involving molecular species are key to energy transfer in gaseous environments. They are commonly governed by an energy gap law, which dictates that transitions are dominated by those between initial and final states with roughly the same ro-vibrational energy. Transitions involving rotational inelasticity are often further constrained by the rotational angular momentum. Here, we demonstrate using full-dimensional quantum scattering on an ab initio based global potential energy surface (PES) that HF–HF inelastic collisions do not obey the energy and angular momentum gap laws. Detailed analyses attribute the failure of gap laws to the exceedingly strong intermolecular interaction. On the other hand, vibrational state-resolved rate coefficients are in good agreement with existing experimental results, validating the accuracy of the PES. These new and surprising results are expected to extend our understanding of energy transfer and provide a quantitative basis for numerical simulations of hydrogen fluoride chemical lasers.

Dynamical constraints on the transfer of angular momentum in rotationally inelastic collisions of I2(B 3Π) with He and Xe

1982 ◽  
Vol 76 (10) ◽  
pp. 4996-5004 ◽  
Author(s):  
S. L. Dexheimer ◽  
M. Durand ◽  
T. A. Brunner ◽  
David E. Pritchard
Keyword(s):  
Angular Momentum ◽  
Inelastic Collisions ◽  
Dynamical Constraints

On the Nonspherical Scattering Amplitude for Inelastic Molecular Collisions

1970 ◽  
Vol 25 (3) ◽  
pp. 336-350 ◽  
Author(s):  
W. E. Köhler ◽  
S. Hess ◽  
L. Waldmann
Keyword(s):  
Angular Momentum ◽  
Bulk Viscosity ◽  
Interaction Potential ◽  
Scattering Amplitude ◽  
Inelastic Collisions ◽  
Momentum Dependence ◽  
Molecular Collisions ◽  
Molecular Scattering ◽  
Polarized Beam ◽  
Linear Molecules

The rotational angular momentum dependence of the nonspherical scattering amplitude is investigated for inelastic collisions of linear molecules. As far as the approximation of small nonsphericity can be applied, this dependence is obtained from the angular momentum dependence of the nonspherical interaction potential. The connection between the nonspherical scattering amplitude and observables that can be measured by molecular scattering experiments involving a polarized beam is discussed. Some qualitative remarks are made on collision brackets occurring in the theoretical expressions for the bulk viscosity and for the Senftleben-Beenakker effect for H2 and HD

Analysis on Radioactive Gas Movement and Delay Status Before Release

2017 ◽  
Author(s):  
Bo Nan Zhu
Keyword(s):  
Activated Carbon ◽  
Nuclear Power ◽  
Theoretical Foundation ◽  
Design Method ◽  
Noble Gas ◽  
Waste Gas ◽  
Gas System ◽  
System Flow ◽  
Radioactive Release ◽  
Rate Dynamic

Based on the PWR nuclear power plant, the sources of radioactive noble gas from core fission and the model of the gas movement in the waste gas system are analyzed, focusing on the delay state analysis of the isotopes of Kr and Xe creeping through the activated carbon. This paper proposes a design method of delay bed mass calculation based on system flow rate, dynamic adsorption coefficient and the holdup time back calculated from the annual radioactive release of waste gas system. Finally the section and dimensions of delay beds are determined based on the flow velocity recommended in ANSI/ANS 55.4. This calculation method lays the theoretical foundation of the waste gas system design and the dimension design for activated carbon delay bed.

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