Gaseous Electronics

55

DIBROMODIFLUORO-METHANE

CONTENTS

55.1 Attachment Rates

55.2 Attachment Cross Sections

References

 

Dibromodifluoromethane (CBr₂F₂) is a polar, electron-attaching gas that has 94 electrons. The electronic polarizability is 10.0 × 10⁻⁴⁰ F m² (Barszczewska et al., 2004 quote a value of 8.0 × 10⁻⁴⁰ F m²), dipole moment 0.66 D, and ionization potential 11.03 eV.

55.1 ATTACHMENT RATES

Dissociative attachment occurs according to the reactions (Kalamarides et al., 1990)

$${\text{CBr}}_2{\text{F}}_2+\text{e}\to {\text{CBr}}_2{\text{F}}_2^{*}\to \{\begin{array}{l}{\text{CBrF}}_2+{\text{Br}}^{-}\hfill \\ {\text{CF}}_2+{\text{Br}}_2^{-}\hfill \end{array}$$ (55.1)

TABLE 55.1Thermal Attachment Rate Constants for CBr₂F₂

Method	Rate Constant (10−13 m3/s)	Reference
Swarm	2.7	Barszczewska et al. (2004)
PR-MW	1.7	Sunagawa and Shimamori (1997)
RA	3.0	Kalamarides et al. (1990)