ABSTRACT
The potential diagram of the ground state molecule and negative ion are shown in Figure 81.2 (Drexel et al., 2003). The electron affinity of the molecule is observed to be positive.
Attachment occurs according to processes (Suresh et al., 2003)
C2Cl4 + e → C2Cl4-* → C2Cl3 + Cl-(81.1)
C2Cl4 + e → C2Cl4-* → C2Cl4 + e (81.2)
Reaction 81.1 is dissociative attachment, Reaction 81.2 is autodetachment, and Reaction 81.3 is direct attachment
81.1 Selected References ......................................................................................................................................................... 465 81.2Ionization Cross Sections................................................................................................................................................ 465 81.3Attachment Cross Sections.............................................................................................................................................. 465 81.4Attachment Rate Constant............................................................................................................................................... 466 References................................................................................................................................................................................. 467
TABLE 81.1 Vibrational Modes and Energies for C2Cl4 Designation Type of Motion Energy (meV)
ν1 CC stretch 194.8 ν2 CCl2 symmetrical -stretch 55.4 ν3 CCl2 scissor 29.4 ν4 CCl2 twist 13.6 ν5 CCl2 asymmetrical -stretch 124.0 ν6 CCl2 rock 43.0 ν7 CCl2 wag 35.7 ν8 CCl2 wag 63.5 ν9 CCl2 asymmetrical -stretch 112.6 ν10 CCl2 rock 21.8 ν11 CCl2 symmetrical -stretch 96.3 ν12 CCl2 scissor 38.4
Source:Adapted from Shimanouchi, T. Tables of Molecular Vibrational Frequencies, NSRDS-NBS, 39, 1972, p. 76.
