CCCBDB listing of experimental data page 2

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Description	Value	unc.	Connectivity				Reference	Comment
Description	Value	unc.	Atom 1	Atom 2	Atom 3	Atom 4	Reference	Comment
rCC	1.347	0.004	3	4			1987Kuchitsu(II/15)
rCC	1.502	0.003	2	3			1987Kuchitsu(II/15)
rCO	1.440	0.002	1	2			1987Kuchitsu(II/15)
rCH	1.100	0.005	2	7			1987Kuchitsu(II/15)
aCCCl	109.3	0.2	2	3	4		1987Kuchitsu(II/15)
aHCH	107.1	3.5	6	2	7		1987Kuchitsu(II/15)
aHCC	134.8	5.6	3	4	11		1987Kuchitsu(II/15)

Bond Type	Count
C-O	2
C-C	2
C=C	1
H-C	6

Atom 1	Atom 2
O1	C2
O1	C5
C2	C3
C2	H6
C2	H7
C3	C4
C3	H10
C4	C5
C4	H11
C5	H8
C5	H9

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	¹A₁	C_2v	True				1.320	1974Hel/Hel(II/6)	μ_a=1.3± 0.02 μ_b=0.25± 0.02 μ_c=0.00± 0.01	C_2v	1	2

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	¹A₁	C_2v	True						C_2v	1	2

	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
1974Hel/Hel(II/6)	Hellwege, KH and AM Hellwege (eds.). Landolt-Bornstein: Group II: Volume 6 Molecular Constants from Microwave, Molecular Beam, and Electron Spin Resonance Spectroscopy Springer-Verlag. Berlin. 1974.	10.1007/b19951
1987Kuchitsu(II/15)	Kuchitsu (ed.), Landolt-Bornstein: Group II: Atomic and Molecular Physics Volume 15: Structure Data of Free Polyatomic Molecules. Springer-Verlag, Berlin, 1987.
webbook	NIST Chemistry Webbook (http://webbook.nist.gov/chemistry)	10.18434/T4D303

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Experimental data for C4H6O (Furan, 2,5-dihydro-)

Experimental data for C₄H₆O (Furan, 2,5-dihydro-)