Table 2.

Anharmonic expansion coefficients^a of 9-mA in cm⁻¹. Values for 9-MA-d₂ are given in parantheses.

g1	−0.2 (−0.2)	g11111	−140.1 (−64.0)
g2	−0.1 (−0.1)	g11112	14.9 (6.8)
ω1	3901.8 (2851.0)	g11122	22.6 (10.3)
ω2	3900.7 (2850.2)	g11222	22.9 (10.4)
γ12’	64.6 (88.3)	g12222	15.1 (6.9)
φ12	−6.7 (−4.9)	g22222	−140.1 (−64.0)
g111	−816.2 (−509.8)	g111111	58.4 (22.8)
g112	6.6 (4.1)	g111112	−8.2 (−3.2)
g122	5.9 (3.7)	g111122	−24.2 (−9.4)
g222	−815.8 (−509.6)	g111222	−23.7 (−9.2)
g1111	319.6 (170.7)	g112222	−24.5 (−9.5)
g1112	−17.4 (−9.3)	g122222	−8.4 (−3.3)
g1122	−13.5 (−7.2)	g222222	58.5 (22.8)
g1222	−17.3 (−9.2)
g2222	319.4 (170.6)

^aThe force constants are listed as ${\mathrm{g}}_{\mathrm{k}1\mathrm{k}2\cdots \text{kn}}^{(\mathrm{n})}=\sqrt{\frac{{\hslash }^{\mathrm{n}}}{2{\mathrm{m}}_{\mathrm{k}1}{\mathrm{\omega }}_{\mathrm{k}1}2{\mathrm{m}}_{\mathrm{k}2}{\mathrm{\omega }}_{\mathrm{k}2}\cdots 2{\mathrm{m}}_{\text{kn}}{\mathrm{\omega }}_{\text{kn}}}}{\mathrm{f}}_{\mathrm{k}1\mathrm{k}2\cdots \text{kn}}^{(\mathrm{n})}$