Kinetic energy release, KER

Thus, scanning of the electric field E scan) yields an energy spectrum which allows for the determination of the kinetic energy release (KER) from the peak width (Chap. 2.8.2). The MIKE technique provides good precursor ion resolution, but poor product ion resolution according to the influence of KER on peak shapes. 

Figure 15. Kinetic energy release (KER) curves for (a) 0+ ions (upper curve and axis), and (b) photoelectrons (lower axis) obtained from the two images shown in Figure 2. Total kinetic energy release is plotted, thus the kinetic energy of each O atom is one-half of the KER, The height of the 0+ curve is multiplied by a factor of 2 with respect to that of the e curve. Note the axis direction for photoelectrons is reversed and displaced to line up with the 0+ curve. Also indicated are positions for the ground-state ion vibrational levels and for excited atoms formed with 0(3P) partners, except for the 0 (3ssS) peak at 0.30eV in the 0+ image, which has an 0(lD) partner.

The RETOF technique has applications far beyond mass analysis and determination of metastable dissociation fraction. In particular, it provides a very valuable approach to determining kinetic energy release (KER) during evaporative dissociation. As shown in this section, these data also find application in determining absolute values of cluster bond energies for systems without a barrier to... 

The El and CID mass spectra of CH2X2+ (X = Cl, Br and I) were also studied100. Large kinetic energy release (KER) values were measured for the fragmentation of the molecular ion to X2+ (X = Cl and Br), leading to the proposal that the CH2 elimination involves a bridged transition state (Scheme 17). 

In a unimolecular dissociation, excess product energy is typically distributed among the translational, rotational and vibrational modes in a statistical fashion. The experimentally observed phenomenon is the distribution of translational kinetic energies of the departing fragment ions (the kinetic energy release, KER)... 

Applying the nuclear wave function the kinetic energy release (KER) and the angular distribution of the photofragments [62] are defined as ... 

Fig. 2 Kinetic energy release (KER) spectra of the DJ photofrag-ments at 1 x lO (a, b) and 1 x lO W/cm (c, d) intensities for five different (10, 20, 30, 40 and 50 fs) pulse lengths. The dashed (Id) and solid curves correspond to the one-dimensional (no LICI situa-...

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