Energy collisional, from excited

Dynamic quenching or collisional quenching normally refers to nonradiative energy transfer from excited species to other molecules ... 

The time constant r, appearing in the simplest frequency equation for the velocity and absorption of sound, is related to the transition probabilities for vibrational exchanges by 1/r = Pe — Pd, where Pe is the probability of collisional excitation, and Pd is the probability of collisional de-excitation per molecule per second. Dividing Pd by the number of collisions which one molecule undergoes per second gives the transition probability per collision P, given by Equation 4 or 5. The reciprocal of this quantity is the number of collisions Z required to de-excite a quantum of vibrational energy e = hv. This number can be explicitly calculated from Equation 4 since Z = 1/P, and it can be experimentally derived from the measured relaxation times. 

Excited electronic states have also been considered to explain NR dissociations of heterocyclic radicals in which low-energy losses of hydrogen atoms compete with high energy ring-cleavage dissociations. The latter reactions were interpreted as starting from excited electronic states of the radicals [27,28]. Formation of excited electronic states upon collisional electron transfer has also been studied with smaller molecular systems, e.g. CHn [45], 02 [46], and H3 [47,48],... 

Some small molecules or ions, such as oxygen, acrylamide, iodide or thiocyanate ions, are able to convert the energy of the excited state into heat, by a process of collisional quenching, whose efficiency is proportional to the concentration of quencher kQ cQ. The processes which contribute to the loss of energy from the excited state can be incorporated into a kinetic equation for the lifetime of the excited state ... 

E.l.Dashevskaya, E.E.Nikitin, and I.Oref, On the adiabaticity restrictions in the collisional energy transfer from highly excited polyatomic molecules, J. Phys. Chem. 97, 9397 (1993)... 

In reactive plasmas consisting of the mixture of a rare gas with an additive host gas of polyatomic molecules, the collisional energy transfer from an excited rare gas atom to a constituent polyatomic molecule to form ions and free radicals is of great importance. 

Fig. 19.2. Block diagram illustrating operation nonlinear wave absorption (d) collisional or of the EDL (a) energy flows from a MW source collisionless dumping (e) collisional excitation into the plasma chamber (b) collisional or of atoms and ions followed by emission, collisionless transformation (c) normal or Adapted from Ref [33].

Table I. Average Step Sizes for Collisional Energy Transfer from Vibrationally Excited Cyclobutane Generated by Recoil Kinetic Chemical Activation...

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