Dissociation adiabatic effects

In contrast to H2/Pd, the vibrational effects in the adsorption of H2/Cu(l 0 0) are mainly caused by the curved reaction path. The basic mechanism can be discussed within a two-dimensional elbow plot shown in Fig. 2b. The PES corresponds to a so-called late barrier system which refers to the fact that the barrier is located after the curved region of PES. If the molecule is already initially vibrating, i.e. if it is oscillating back and forth in the d-direction, then the vibrational energy can be very efficiently used to make it around the curve and enter the dissociation channel. Nevertheless, adiabatic effects as just discussed in the context of the hydrogen dissociation on Pd(l 00) also contribute to the vibrational effects for H2/Cu(l 0 0). 

Quantum Effects in Collisional Friction The Tlansition Regime of Aerodynamics Hydrodynamic and Viscoelastic Effects Mass Dependence of Self-Diffusion Pair Dissociation—A Stochastic Approach A. Diatomic Dissociation on a J-Averaged Potential Adiabatic Effects in Diatomic Dissociation... 

In this section the question of the accuracy of using the effective potential of Eq. (2.26) in dissociation dynamics of a diatomic is studied in the low-friction limit, which corresponds to dissociation in a low-density bath gas. Comparison with experiment will be considered later in this section, but this comparison is difficult because of complexities in real systems, such as adiabatic effects arising from the friction kernel and multiple electronic surfaces. In this... 

These strong non-adiabatic effects observed in the cone-states of the upper sheet contrast with the absence of any significant effect in the H-I-H2 reactive collision. Eor instance, Mahapatra et al. [69] examined the role of these effects in the H -f H2 (v = 0, = 0) reaction probability for / = 0 and found negligible nonadiabatic coupling effects in the initial state selected probability. Subsequently, Mahapatra and co-workers [70] reported initial state-selected ICS and thermal rate constants of H -I- H2(HD) for total energies up to the three body dissociation. Again, they... 

H2, N2, Og, ci2 or He, Ne, A Kr. The luminosity was described as very feeble in H3 or He. The expln of 0.4ml of a 3 1 mixture of TNM-toluene in argon gave a flash lasting under 3 micro secs with a brilliancy of 2.5—10 million candles. The effect was attributed to heating of the gas by adiabatic compression by the expln wave and to the dissociation of molecules and... 

The most extensive potential obtained so far with experimental confirmation is that of Le Roy and Van Kranendonk for the Hj — rare gas complexes 134). These systems have been found to be very amenable to an adiabatic model in which there is an effective X—Hj potential for each vibrational-rotational state of (c.f. the Born Oppenheimer approximation of a vibrational potential for each electronic state). The situation for Ar—Hj is shown in Fig. 14, and it appears that although the levels with = 1) are in the dissociation continuum they nevertheless are quasi bound and give spectroscopically sharp lines. 

The adiabatic flame temperature is the maximum theoretical temperature that can be reached by the products of combustion of a specific fuel and air (or oxygen) combination assuming no loss of heat to the surroundings until combustion is complete. This theoretical temperature also assumes no dissociation, a phenomenon discussed later under this heading. The heal of combustion of Ihe fuel is the major factor in the flame temperature, but increasing the temperature of the air or of the fuel will also have the effect of raising the flame temperature. As would be expected, this adiabatic temperature is a maximum with zero excess air (only enough air chemically required lo combine with the fuel), since any excess is not... 

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