Center-of-mass collision energy

The absolute upper limit for the value of Q is defined by the center-of-mass collision energy. Ecu, [115,116]... 

Figure 8. Variation of the measured H2-H2 signal ratio as a function of center-of-mass collision energy for H2 selected in v+ = 0, N = 1.

Mass selection of the phenyl anions in a triple quadrupole mass spectrometer followed by CAD yields exclusively C + C6H4 (Scheme 17). Monitoring [CF] as a function of the center-of-mass collision energy allows one to determine the critical energies for Cl" appearance (E ). These are 67 4, 122 7 and 173 3 klmoF for the perdeutero isotopomers of 548 23a, 24a and 25a , respectively. From these energies (E ), the heats of formation of the sought benzynes can be calculated according to the equation. 

Center of Mass Collision Energy The Maximum Fraction of the Relative Kinetic Energy Between Two Objects that can he Transformed into Internal Energy... 

The first crossed-beam scattering experiments using Stark-decelerated beams have been performed on the OH-Xe system. By changing the velocity of the OH radicals from 33 m/s to 700 m/s, while the velocity of the Xe atoms is kept fixed at 320 m/s, the total center-of-mass collision energy in this system is varied from 50 cm to 400 cm The collision energy is thereby varied over the energetic thresholds for inelastic scattering into the first excited rotational levels of the OH radical. 

ArD N2- The dependence of the reaction cross section for the deuteron transfer on the center-of-mass collision energy (0 to 15 eV) was studied mass spectrometrically [32]. 

H " N2- a flow-drift tube experiment showed the rate constant to decrease to about one-half Its thermal value on raising the center-of-mass collision energy from thermal energy (0.05 eV) to 1.5 eV. A reaction enthalpy of -54 kJ/mol was estimated [18]. 

The energy dependence of the cross sections for the reactions of thermal N4 ions with H2, HD, and D2 was determined for center-of-mass collision energies from thermal up to 5 eV using the ion-beam target-gas technique. The total cross section for the reactions with HD (N4 + HD->N2H (N2D ) +D(H)) is equal to the cross sections for the reactions with H2 and D2. An isotope effect was observed in the reaction with HD at energies above 0.1 eV, formation of N2D" over N2H is favored [5]. 

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