Gaseous Electronics

Appendix 9: Quadrupole Moments of Target Particles

CONTENTS

References

 

The quadrupole moment of a molecule (µ_Q) is expressed in units of DÅ (Debye Ångstrom) with a value of 3.3351 × 10⁻³⁰ (Coulomb meter) × 10⁻¹⁰ (meter) = 3.3351 × 10⁻⁴⁰ C m². The earlier unit is

$$\begin{array}{lll}\hfill {\text{ea}}_{\text{o}}^2& =\hfill & 1.602\times {10}^{-19}(\text{Coulomb})\times {(5.2917\times {10}^{-11})}^2\hfill \\ \hfill ({\text{meter}}^2)& =\hfill & 4.4859\times {10}^{-40}{\text{Cm}}^2\hfill \end{array}$$

Molecule		µQ (×10−41 C m2)	Reference
Name	Formula
Ammonia	NH3	−77.40
Benzene	C6H6	−304	Ritchie and Watson (2000)
Bromine	Br2	171.8
Bromine monofluoride	BrF	30.32
Carbon dioxide	CO2	−142.7	Jain and Baluja (1992)
Carbon disulfide	CS2	60.3	Sohn et al. (1987)
Carbon monosulfide	CS	3.36
Carbon monoxide	CO	−94.71
Carbon tetrachloride	CCl4	0
Carbonyl sulfide	COS	103.8	Sohn et al. (1987) ...