ABSTRACT
Nitrous oxide (N2O) is a polar, electron-attaching molecule that has 22 electronsIt is a linear asymmetric molecule with the structure N-N-O with bond lengths 0113 and 0119 nm for the N-N bond and N-O bond, respectivelyIts electronic polarizability is 337 × 10−40 F m2, dipole moment is 0161 D, and ionization potential is 12886 eVThe vibrational modes are shown in Table 341 (Shimanouchi, 1972)
See Table 342
See Table 343 Highlights of Figure 341 are
1 As the energy decreases toward zero, there is a trend toward an increase of cross section, possibly due to the attachment of electrons and a smaller contribution from the dipole moment, which is also relatively low, 0167 D
2 A shape resonance at 25 eV 3 A second shape resonance at 89 eV(Kitajima et al,
1999), though this resonance is not seen in the total scattering cross section
4 A broad peak in the 10-30 eV range due to inelastic scattering including ionizationThis feature is common to many gases
5 A monotonic decrease beyond 30 eV which is also a common feature observed in many gases
341 Selected References for Data 219 342 Total Scattering Cross Section219 343 Differential Scattering Cross Section 221 344 Elastic and Momentum Transfer Cross Sections 221 345 Vibrational Excitation Cross Sections 222 346 Electronic Excitation Cross Sections 223 347 Ionization Cross Section 223 348 Partial Ionization Cross Sections 223 349 Reaction Schemes 224 3410 Attachment Cross Sections 224 3411 Attachment Rate Constant 225 3412 Drift Velocity of Electrons 226 3413 Longitudinal Diffusion Coefficient (DL/µ) 226 3414 Electron Mean Energy 227 3415 Ionization and Attachment Coefficients 227 3416 Gas Constants 228 3417 Consolidated Cross Sections 228 References 229
TABLE 34.1 Vibrational Modes for N2O
Designation Type of Motion Energy (meV)
ν1 NN stretch 2672 ν2 Bend 709 ν3 NO stretch 1568
Source:Adapted from Shimanouchi, T, Tables of Molecular Vibrational Frequencies Consolidated Volume I. NSRDA-NBS 39, US Department of Commerce, Washington (DC), 1972
Selected References for DN2O
Quantity Range: eV, (Td) Reference
Drift velocity (250-2500) Lisovskiy et al. (2006) Ionization cross section 13-1000 Lindsay et al. (2003) Ionization cross section 13-200 Lopez et al. (2003) Swarm parameters (10-300) Mechlin´ska-Drewko
et al. (2003) Differential cross section 15-100 Kitajima et al. (1999) Swarm parameters (7-5000) Yoshida et al. (1999) Attachment cross section 0-4 Brυ¨ning et al. (1998) Elastic cross section 001-50 Winstead and McKoy
(1998)
Ionization cross section 13-1000 Kim et al (1997)
Total cross section 600-4250 Shilin et al. (1997) Ionization cross section 20-1000 Iga et al. (1996) Total cross section 90-4000 Zecca et al. (1995) Elastic cross section 5-80 Johnstone and
Newell (1993) Attachment cross section 0-50 Krishnakumar and
Srivastava (1990) Total cross section 40-100 Szmytkowski et al.
