Improved Potential Energy Surface of Ozone Constructed Using the Fitting by Permutationally Invariant Polynomial Function

Table 2

Allowed values of the powers for various monomial terms, up to 5th order.

Monomial order 𝑗	Coefficient	Powers
		ℓ1	ℓ2	ℓ3
0	C0	0	0	0
1	C1	1	0	0
2	C2a	2	0	0
	C2b	0	1	0
3	C3a	3	0	0
	C3b	1	1	0
	C3c	0	0	1
4	C4a	4	0	0
	C4b	2	1	0
	C4c	1	0	1
	C4d	0	2	0
5	C5a	5	0	0
	C5b	3	1	0
	C5c	2	0	1
	C5d	1	2	0
	C5e	0	1	1