Accurate laboratory rest frequencies of vibrationally excited CO up to v = 3 and up to 2 THz

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Table 2:

Spectroscopic parameters^a (MHz) of CO in excited vibrational states compared with that in the ground vibrational state.
Parameter	$\varv = 0^b$	$\varv = 1$	$\varv = 2$	$\varv = 3$
$B_{\varv}$	57 635.968 019 (28)	57 111.243 12 (66)	56 586.555 00 (157)	56 061.910 5 (59)
$D_{\varv} \times 10^3$	183.504 89 (16)	183.490 3 (71)	183.474 0 (234)	183.511 (63)
$H_{\varv} \times 10^9$	171.68 (10)	177.9 (145)	163. (53)	241. (134)

^a Numbers in parentheses are one standard deviation in units of the least significant figures.
^b Winnewisser et al. (1997).

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