ABSTRACT
Carbon tetrachloride (CCl4), synonym tetrachloromethane, has 74 electronsIt is nonpolar and possesses electronic polarizability of 1246 × 10−40 F m2 The ionization potential is 1147 eVIt has four vibrational modes as shown in Table 501 (Shimanouchi, 1972)The molecule is electron-attaching with a high electron affinity of 212 eV (see Sierra, 2005) and the lowest electronic excitation potential is below 7 eV (Jones, 1986)
See Table 502
Total scattering cross sections in CCl4 are shown in Tables 503 and 504See Figure 501 for graphical presentation The highlights of the total cross section are
1 At low electron energy (<1 eV) the cross section increases enormously to 860 × 10−20 m2 at ~001 eV due to dissociative attachment (Randell et al, 1993)
2 A Ramsauer-Townsend minimum occurs at very low energy of ~40-60 meV (Randell et al, 1993)
3 There is a resonance peak at ~12 eV due to dissociative attachment
4 A second peak at ~8 eV which is also due to resonance in dissociative attachment (Jones, 1986)This
501 Selected References for Data 311 502 Total Scattering Cross Sections311 503 Elastic Scattering Cross Sections313 504 Positive Ion Appearance Potentials313 505 Ionization Cross Sections313 506 Ion Pair Production 314 507 Attachment Rates315 508 Attachment Cross Sections316 References317
TABLE 50.1 Vibrational Modes of CCl4 Designation Energy (meV) Mode
ν1 499 Symmetric stretch ν2 269 Degenerate deformation ν 962 Degenerate stretch ν 389 Degenerate deformation
TABLE 50.2 Cross Sections
Quantity Energy Range (eV) Reference
Qi 15-85 Sierra et al (2005) Qi 15-1000 Lindsay et al (2004) ka 0-2 Matejcˇìk et al (2003) ka 0-0173 Klar et al (2001) Qi 12-215 Hudson et al (2001) ka — Burns et al (1996) Qa 10−6-01 Dunning (1995)
QT 08-400 Hamada and Sueoka (1995) Qa 0001-15 Matejcik et al (1995) Qel 0-40 Natalense et al (1995) ka 0026-035 Spanel et al (1995) QT 001-10 Randell et al (1993) ka 0005-25 Shimamori et al (1992)
continued
TABLE 50.4 Total Scattering Cross Section in CCl4 at Selected Intervals of Energy
Energy QT (10−20 m2)
06 4176
10 6636
15 6644
20 5198
25 4228
30 3994
35 4135
40 4420
50 5128
60 6014
70 6949
80 6917
100 6570
continued
Cross Sections
Quantity Energy Range (eV) Reference
Qa 0-100 Ling et al (1992)
QT 75-4000 Zecca et al (1992)
QT, Qa 0-12 Wan et al (1991)
ka 001-10 Harth et al (1989)
ka — Harth et al (1989) QT 05-50 Jones (1986)
Qa 0-008 Chutjian and Alajajian (1985)
Qi 15-180 Leiter et al (1984)
ka — Smith et al (1984) Qel 10-400 Daimon et al (1983)
ka 0-2 Ayala et al (1981)
Qa 0-2 Christophorou et al (1981)
ka 0008-0025 Boltz et al (1977)
ka Thermal Davis et al (1973)
ka — Mothes et al (1972) ka 005-08 Christodoulides and
Christophorou (1971)
Qa 01-25 Christophorou and McCorkle (1971)
Qa 0-2 Blaunstein and Christophorou (1968)
Note:ka = Attachment rate; Qa = attachment; Qi = ionization; QT = total cross section
TABLE 50.3 Total Scattering Cross Section in CCl4
Randell et al. (1993) Hamada and Sueoka
(1995) Zecca et al. (1992)
Energy (eV)
QT (10−20 m2) Energy
QT (10−20 m2) Energy
QT (10−20 m2)
08 564 75 382 001 86484 10 582 80 370 002 65039 12 570 90 361 003 40078 14 557 100 366 005 22148 16 545 110 350 010 11250 18 507 125 342 020 6680 20 476 150 310 040 4922 22 444 175 289 060 3516 25 411 200 280 080 4922 28 407 225 256 10 5274 31 395 250 244
34 387 275 235 37 393 300 226 40 402 350 208 45 423 400 194 50 437 450 179 55 487 500 164 60 499 600 147 65 542 700 133 70 579 800 125 75 583 900 111 80 620 1000 103 85 600 1100 94
Cross Section in CCl4
Randell et al. (1993) Hamada and Sueoka
(1995) Zecca et al. (1992)
Energy (eV)
QT (10−20 m2) Energy
QT (10−20 m2) Energy
QT (10−20 m2)
90 595 1250 87 95 587 1500 76
100 597 1750 68 110 575 2000 60 120 550 2250 55 130 550 2500 50 140 544 2750 46 150 540 3000 43 160 530 3250 40 170 507 3500 37 180 503 4000 34 190 505 200 503 220 478 250 456 300 419 350 405 400 384 500 365 600 352 700 331 800 325 900 315
1000 311 1200 295 1500 286 2000 275 2500 247 3000 223 3500 210 4000 192
peak, though not the process from which it results, is common to many gases
5 A monotonic decrease beyond this peak, also common to many gases
(1995) are available as shown in Table 505 and Figure 502
Table 506 shows the positive ion appearance potentials for CCl4 (Sierra et al, 2005)
Selected experimental ionization cross sections are shown in Figure 503Tabulated values of Lindsay et al(2004) and Sierra et al (2005) are shown in Table 507
Partial ionization cross sections are shown in Tables 508 and 509, with a graphical presentation in Figure 504A further table of ionization cross sections from Hudson et al (2001) is shown in Table 582 in the section on dichloromethane (CH2Cl2)
10-2 100
101Q T
(1 0-
2 ) 102
10-1
Hamada et al.
