CCCBDB listing of experimental data page 2

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Mode Number	Symmetry	Frequency			Intensity			Comment	Description
Mode Number	Symmetry	Fundamental(cm^-1)	Harmonic(cm^-1)	Reference	(km mol^-1)	unc.	Reference	Comment	Description
2	A'	2023		webbook
6		494		webbook

Bond Type	Count
H-C	1
C=C	1
C=O	1

Atom 1	Atom 2
C1	C2
C1	O3
C2	H4

State	Config	State description	Conf description	Exp. min.	Dipole (Debye)				Reference	comment	Point Group	Components
State	Config	State description	Conf description	Exp. min.	x	y	z	total	Reference	comment	Point Group	dipole	quadrupole
1	1	²Π	C_∞v	False							C_∞v	1	1
1	2	²A^"	C_s	True							C_s	2	3

State	Config	State description	Conf description	Exp. min.	Quadrupole (D Å)			Reference	comment	Point Group	Components
State	Config	State description	Conf description	Exp. min.	xx	yy	zz	Reference	comment	Point Group	dipole	quadrupole
1	1	²Π	C_∞v	False						C_∞v	1	1
1	2	²A^"	C_s	True						C_s	2	3

	Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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squib	reference	DOI
1987End/Hir:4319	Y Endo, E Hirota "The submillimeter-wave spectrum of the HCCO radical"J. Chem. Phys. 86, 4319, 1987	10.1063/1.451892
2002Rie/Tsc:231	JC Rienstra-Kiracofe, GS Tschumper, HF Schaefer III, S Nandi, GB Ellison "Atomic and Molecular Electron Affinities: Photoelectron Experiments and Theoretical Computations" Chemical Reviews 2002, 102, 231-282	10.1021/cr990044u
webbook	NIST Chemistry Webbook (http://webbook.nist.gov/chemistry)	10.18434/T4D303

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Experimental data for HCCO (ketenyl radical)