Translational energy release, and

In addition to CO(v = 0—2,7) populations, Houston and Kable recorded CO Doppler profiles to measure the translational energy release, and the vector correlation between the recoil velocity vector and the angular momentum vector of CO. Together, these data paint a compelling picture that two pathways to CH4 + CO are operative. The rotationally hot CO population (85% of total CO)... 

Because the pathway to H + HCO on So is barrierless (with a loose TS), whereas the pathway on Ti has an exit barrier (tight TS), the dissociation dynamics of the two pathways can be expected to differ markedly. Measuring the translational energy release and the product state distributions of the HCO fragment are therefore appropriate experimental techniques for exploring this competition. 

Fig. 30. Contour plot of photoelectron-photodissociation coincidence spectrum as a distribution of photoelectron intensity (dark shade = low, light shade = high) against the electron binding energy and relative translational energy of the photofragments. Also shown on the left and at the bottom are the partially averaged distributions for the translational energy release and the electron binding energy, respectively.

B.1 Reduced distributions translational energy release and angular distribution... 

Using a forward-convolution program131 with instrumental and experimental parameter inputs (aperture sizes, flight distances, beam velocities, etc.), along with two center-of-mass (CM) input functions (the translational energy release distribution, P(E), and the CM angular distribution, T(0)), TOF spectra and lab angular distributions were calculated and compared... 

Infra-red chemiluminescence has been used to measure the vibrational state distributions of CO2 formed by reaction on Pt and Pd surfaces [45-50]. While the detection sensitivity of infrared chemiluminescence does not approach that of LIF or REMPI, it is an attractive way to probe molecules such as CO2 where there is substantial vibrational excitation and REMPI schemes are not available. In some cases Doppler measurement of the translational energy release can be achieved, giving direct information on the translational energy release of vibrationally excited C02 [45]. Recently infrared diode laser spectroscopy has been used to detect vibrationally excited CO2 from CO oxidation over... 

Figure 26 Translational energy released into N2 formed by reaction of NO and H2 at a Pd(l 1 0) surface held at 600 K [127]. The solid line is a fit to a thermal translational energy release, giving T = 425 K.

Phase space theory has been able to reproduce experimental distributions of translational energy releases closely for a number of decompositions which do not have energy barriers to the reverse reactions [165, 485] (see Sect. 8). Phase space theory does focus attention on a very late stage of reaction since the degrees of freedom of the loose transition state can be identified as vibrations, rotations and translations. 

Translational energy release for decompositions occurring within ion sources is an area of inquiry with a long history [311] and one in... 

Breakdown diagrams and lifetimes of metastable ions are covered here. Certain translational energy releases are discussed, but fuller coverage of energy releases is given in Sect. 8. 

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