Table 9. Expansion coefficients of the potential energy surfaces (in cm ^-1) ^a .

CH 3CO
A l			M	A l		M		A l		M
66.538			0	-71.867		3		5.329		6
CH 2COH
A nl		N	L	A nl		N	L	A nl		N	L
2308.050		0	0	0.572		2	2	-4.161		-1	1
-1958.054		2	0	-0.6x10 -4		2	4	0.7x10 -4		-1	3
-55.340		4	0	-0.046		4	2	-3.838		-3	1
38.721		6	0	0.1x10 -4		4	4	-0.11x10 -3		-3	3
0.589		0	2	0.001		6	2	0.534		-5	1
0.10x10 -3		0	4	-0.2x10 -5		6	4	-0.1x10 -4		-5	3
CH 2COCH 3
A mnl	N	M	L	A mnl	N	M	L	A lmn	N	M	L
1936.238	0	0	0	-0.12x10 -3	2	0	4	0.1x10 -5	4	3	4
-1432.135	2	0	0	0.069	4	0	2	0.008	-1	3	1
-61.140	4	0	0	-0.4x10 -4	4	0	4	-0.1x10 -4	-1	3	3
-2.543	6	0	0	0.019	6	0	2	-1.108	-3	3	1
-149.629	0	3	0	-0.10x10 -4	6	0	4	-0.5x10 -4	-3	3	3
-0.521	0	6	0	0.062	-1	0	1	-0.033	-5	3	1
0.379	0	0	2	0.007	-1	0	3	0.5x10 -4	-5	3	3
0.23x10 -3	0	0	4	2.883	-3	0	1	0.038	-2	-3	2
72.044	2	3	0	0.001	-3	0	3	-0.1x10 -4	-2	-3	4
-1.843	2	6	0	-0.112	-5	0	1	-0.013	-4	-3	2
-3.507	4	3	0	-0.5x10 -4	-5	0	3	0.2x10 -5	-4	-3	4
-0.023	4	6	0	-0.005	0	3	2	-0.056	-6	-3	2
0.378	6	3	0	0.1x10 -4	0	3	4	0.3x10 -4	-6	-3	4
0.347	6	6	0	-0.001	0	6	2	0.304	1	-3	1
-73.592	-2	-3	0	-0.023	2	3	2	0.3x10 -4	1	-3	3
6.280	-4	-3	0	0.1x10 -5	0	6	4	-1.382	3	-3	1
0.559	2	0	2	0.003	4	3	2	0.6x10 -3	3	-3	3

a) M=3m; N=2n or 2n+1; L=2l or 2l+1; M ≥ 0 ⇒ cos 3mθ _{1 ;} M < 0 ⇒ sin 3mθ ₁; N ≥ 0 ⇒ cos Nθ _{2 ;} N < 0 ⇒ sin Nθ _{2 ;}