CO

Carbon Monoxide Rotational Parameters

Isotopic
Species		 B0 [MHz] D0 [kHz] H0 [Hz] µr [u] Ref.
12C16O 57 635.968 28(12) 183.5058(22) 0.171 78(11) 6.856 208 64  
13C16O 55 101.0138(23) 167.688(5) 0.1518(35) 7.172 412 66  
12C18O 54 891.4238(37) 166.406(44) 0.133(59) 7.199 865 59  
14C16O 52 935.864(12) 154.734(2) a   7.466 480 88 58008
13C18O 52 356.011(12) 151.355(2) a   7.549 370 36
12C17O 56 179.913(9) 174.330(2) a   7.034 334 35 81014

a From isotope relations and value for 12C16O.

 

Other Molecular Constants for CO

Parameter 12C16O Ref 13C16O Ref 12C17O Ref
µ0 [C · m]
     µ0  [D]		 0.366  25(10) x 10-30 
     0.109 80(3)		 75070        
gJ (µN) -0.2689 67044 -0.256 91(20) 68002    
eQq0 (O) [MHz]         4.337(56) 81014
c0 [kHz]         -30.4(12)

 

Equilibrium Constants for 12C16O

Parameter a Value Ref.
ωe [cm-1] 2169.755 89(23) 91011
ωe χe [cm-1] 13.288 03(5)
ωe ye [cm-1] 0.010 4109(43)
Be [MHz] 57 907.98(6)
αe [MHz] 524.791(13)
De [MHz] 0.183 5208(57)
re [10-10 m] 1.128 229(1) b  

a For mass-independent Dunham parameters see: T. George, W. Urban, and A. Le Floch, J. Mol. Spectrosc. 165, 500 (1994).

b Recalculated as re = [505 379.006(51) / µrBe]1/2 with units as given in table.

NIST Physical Measurement Laboratory National Institute of Standards and Technology NIST Physical Measurement Laboratory Back to the diatomic molecule selection page