Nitrogen velocity distribution

Despite the fact that relaxation of rotational energy in nitrogen has already been experimentally studied for nearly 30 years, a reliable value of the cross-section is still not well established. Experiments on absorption of ultrasonic sound give different values in the interval 7.7-12.2 A2 [242], As we have seen already, data obtained in supersonic jets are smaller by a factor two but should be rather carefully compared with bulk data as the velocity distribution in a jet differs from the Maxwellian one. In the contrast, the NMR estimation of a3 = 30 A2 in [81] brought the authors to the conclusion that o E = 40 A in the frame of classical /-diffusion. As the latter is purely nonadiabatic it is natural that the authors of [237] obtained a somewhat lower value by taking into account adiabaticity of collisions by non-zero parameter b in the fitting law. 

We are also interested in the effect of temperature on the velocity distribution in a gas. Figure 5.16 shows the velocity distribution for nitrogen gas at three temperatures. Note that as the temperature is increased, the curve maximum, which reflects the average velocity, moves toward higher values and the range of velocities becomes much larger. 

The velocity distribution for nitrogen gas at 273 K, with the values of most probable velocity (ump, the velocity at the curve maximum), the average velocity (uavg), and the root mean square velocity (urms) indicated. 

Electrons are the origin of most of the chemical reactions happening at atmospheric pressure plasma based processes hence, their energy distribution plays an important role in plasma chemical reactions. The electron velocity distribution function (EVDF) in our system is determined on the basis of the emission of nitrogen molecule (equations 1-13). For this... 

Figure 1.1 Velocity distribution of air molecules (nitrogen and oxygen) at 0, 25 and at 400 °C...

THGURE5.19 Velocity Distribution for Nitrogen at Several Temperatures... 

Figure 1.9 Molecular energies follow the Maxwell-Boltzmann distribution energy distribution of nitrogen molecules (as y) as a function of the kinetic energy, expressed as a molecular velocity (as x). Note the effect of raising the temperature, with the curve becoming flatter and the maximum shifting to a higher energy...

Comparison of Active Metal Pairs. The catalysts were evaluated at a temperature of 780°-850°F at a 2000°-2800°F pressure with a space velocity of 0.5 vol/vol/hr. The range of product distribution from this evaluation is summarized in Table IV. The quality of liquid product as defined by gravity, and by residuum (975°F +), hydrogen, nitrogen, sulfur, and oxygen contents, and by carbon on spent catalysts is presented... 

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