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	hartrees
Energy at 0K	-27.654208
Energy at 298.15K
HF Energy	-27.654208
Nuclear repulsion energy	32.572148

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)	Raman Act (Å⁴/u)	Dep P	Dep U
1	A₁	3609	3241	1.53	64.55	0.31	0.47
2	A₁	2000	1796	2.88	102.47	0.20	0.34
3	A₁	1179	1059	22.60	11.37	0.60	0.75
4	A₁	1000	898	82.76	10.64	0.70	0.83
5	A₂	762	684	0.00	28.54	0.75	0.86
6	B₁	698	627	125.90	0.03	0.75	0.86
7	B₂	3519	3160	53.50	12.90	0.75	0.86
8	B₂	1076	966	3.75	1.15	0.75	0.86
9	B₂	457	411	7.72	15.61	0.75	0.86

Atom	y (Å)	z (Å)
O1	0.000	0.872
C2	0.637	-0.455
C3	-0.637	-0.455
H4	1.662	-0.761
H5	-1.662	-0.761

	O1	C2	C3	H4	H5
O1		1.4720	1.4720	2.3296	2.3296
C2	1.4720		1.2739	1.0693	2.3188
C3	1.4720	1.2739		2.3188	1.0693
H4	2.3296	1.0693	2.3188		3.3231
H5	2.3296	2.3188	1.0693	3.3231

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	C3	64.361	O1	C2	H4	132.254
O1	C3	C2	64.361	O1	C3	H5	132.254
C2	O1	C3	51.278	C2	C3	H5	163.386
C3	C2	H4	163.386

All results from a given calculation for C₂H₂O (Oxirene)

using model chemistry: HF/CEP-31G*

States and conformations

	Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
	Home All data for one species Geometry Experimental Experimental Geometries Same bond/angle many molecules Internal Coordinates by type Bond angles Calculated Calculated geometry Rotational constant Moments of inertia Products of moments of inertia BSE Bond lengths Show me a calculated geometry Comparisons Bonds, angles Rotational Constants Products of moments of inertia Point group Bad Calculations Bad moment of inertia Tutorials and Explanations Angle formulas Vibrations Experimental Vibrational frequencies Calculated Frequencies Scale factors Reactions Entropies Ions List Ions Energy Calculated Ionization Energy Compare Ionzation energy Electron Affinity Calculated Electron affinity Compare Electron affinity Proton Affinity Calculated Proton affinity Compare Proton affinity Ionization changes point group Experimental One molecule all properties One property a few molecules Enthalpy of formation Entropy Integrated Heat Capacity Heat Capacity Rotational Constants Vibrational Frequencies Dipole moment Ionization Energy Polarizability Quadrupole Point Groups Geometry Experimental Geometries Internal Coordinates by type Bond angles Rotational Constants Point Groups Diatomic bond lengths Vibrations Vibrational frequencies Diatomic Triatomics Energy Atomization Energy Internal Rotation Electrostatics Dipole Quadrupole Polarizability Reference Data Reference states Spin Splittings Molecules with good enthalpy Enthalpy at 0 Kelvin Calculated Energy Optimized Energy Energy 298K Minimum conformation Hydrogen bonds H bond with counterpoise Reaction Reaction Energy 0K Reaction Energy 298K Internal Rotation Barriers to internal rotation Rotational barrier and dipole Rotational Barrier 2 molecules Orbital HOMO LUMO gap HOMO Orbital Energies Nuclear repulsion energy Correlation Full vs Frozen core energies Partial correlation energies Ion Calculated Ionization Energy Vertical ionization Energy Calculated Electron affinity Calculated Proton affinity Atom charge differences Excited State Singlet triplet gap Electronic state Transition state Basis Set Extrapolation BSE energy BSE Bond lengths Geometry Calculated geometry AIM bond orders One type of bond Rotation Rotational constant Products of moments of inertia Moments of inertia Inertial defects Second moments Point group State symmetry <r2> Sorted by r2 Z-matrix Bad Calculations Bad moment of inertia Bad Calculated Bond Lengths Bad point group Worst molecules Vibrations Frequencies Animated vibrations Anharmonic Zero point energy (ZPE) Scale Factors Scale factors Scale factor uncertainty Calculate a scale factor Why scale vibrations Set scaling factors Bad Calculations Bad Vib. 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Calc. vs exp. Bad Vib. HF vs MP2 Bad scale factors Low excited states Oddities NaCN Is not linear FAQ Help Units Choose Units Energy Bond length Rotational Constant Moment of Inertia Dipole and Quadrupole Polarizability Explanations Hartree cm-1 Debye Credits Just show me Show me a calculated geometry Summary Using older interface Limit Basis sets Method options List Recent molecules Choose a few Molecules Number of atoms By heavy atoms Diatomics InChI Deuterated Dimers Geometry Point group Point group count Bonds types Isodesmic reactions Bad point group Multiple conformers, states Vibrations Big anharmonicity Energy Enthalpy at 0 Kelvin Similar molecules Similar Isomers Cis/trans Tautomers Multiple conformers, states Ions, Dipoles, etc. List Ions Ionization changes point group Dipole Quadrupole Polarizability Proton Affinities Index of CCCBDB Feedback Error form Wants
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Number	Element	Mulliken
1	O	-0.378
2	C	-0.115
3	C	-0.115
4	H	0.304
5	H	0.304

	x	y	z	Total
	0.000	0.000	-2.712	2.712
CHELPG
AIM
ESP

<r²>	26.310
(<r²>)^1/2	5.129

All results from a given calculation for C2H2O (Oxirene)

using model chemistry: HF/CEP-31G*

States and conformations

All results from a given calculation for C₂H₂O (Oxirene)