Collision glancing

The earlier evaluation of the core radius was in terms of Bohr s impulse condition (see Sect. 2.3.3) at (relatively) high energies. This gives the core radius as 30 A at a particle energy of 10 MeV/amu. For much lower energies, this relation is unrealistic, since electrons ejected in glancing collisions penetrate... 

To calculate the energy partition between the core and the envelope, Mozumder et al. (1968) considered the equipartition of deposited energy between glancing and knock-on collisions (Sect. 2.3.4). Of the ejected electrons... 

At first glance the necessity to use collision activation or metastable ion spectra is less evident. However, these two methods allow, first of all, recording pure mass spectra,... 

At first glance, it might appear that the vast majority of the bimolecular reactions with which one deals in the troposphere are simple concerted reactions, that is, during the collision of the reactants there is a reorganization of the atoms, leading directly to the formation of the products. However, it has become increasingly apparent in recent years that some important reactions that appeared to be concerted exhibit characteristics such as pressure dependencies that are not consistent with a direct concerted process. 

The bottom collision shown in Fig. 10.3 has an impact parameter b — d, and is labeled a glancing collision. By Eq. 10.68, its line-of-centers energy available for chemistry is zero. Any collision with b > d also has no contribution to e c, because the molecules miss one another completely. 

If the energy is transferred is small portions, leading to excitation of a molecule from the ground state into the nth quantum state with transition energy hw0n (this sort of collisions are called glancing), the cross section is given by Bethe s formula... 

Models 1-4 have a fundamental drawback The librational absorption band calculated for water appears to be too wide. This drawback at first glance could be overcome, if one employs the so-called field models, in which the static potential presents a smooth well (where a notion of a collision of a dipole with a wall actually has no physical sense). However, from the discussion given just below we shall see that this reasonable idea does not work properly with respect to calculating the wideband spectra in water. 

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