Table 2.1. Determinable rotational and centrifugal distortion constants (P⁴) employed by various workers^a

Kivelson-Wilson Parameters for planar molecules	Kirchhoff parameters (following Watson [15])	Watson parameters [16]
A	A = A - 1/2bbcc	A
B	B = B - 1/2aacc	B
C	C = C - 1/2aabb	C
aaaa	aaaa	J
bbbb	bbbb	JK
abab	cccc	K
aabb	1 = aabb + bbcc + ccaa	J
aabb	2 = (A / S) bbcc + (B / S) aacc + (C / S) aabb	K
aFor conversion between the various sets of parameters see References [4], [9], [10], and [17].

Table of Contents       Introduction 1. General Description of the Tables 2. Molecular Parameters and Energy 3. Evaluation of the Spectral Data 4. List of Symbols 5. Special Units, Fundamental Constants, and Useful Conversion Factors 6. Acknowledgments and References to the Text