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	hartrees
Energy at 0K	-263.755637
Energy at 298.15K	-263.749566
Nuclear repulsion energy

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A	3642	3476	46.44
2	A	3382	3228	230.20
3	A	3152	3008	39.05
4	A	2801	2674	822.39
5	A	1761	1681	26.45
6	A	1700	1623	264.77
7	A	1556	1485	42.20
8	A	1453	1387	18.16
9	A	1214	1159	192.57
10	A	1198	1144	174.07
11	A	1066	1018	24.46
12	A	832	794	431.14
13	A	715	682	8.23
14	A	474	452	89.48
15	A	379	362	50.05
16	A	341	325	118.30
17	A	257	245	10.46
18	A	246	235	35.18

Atom	x (Å)	y (Å)	z (Å)
H1	0.535	0.937	-0.055
O2	-0.476	1.164	-0.004
O3	1.796	-0.040	-0.089
C4	-1.170	0.002	0.022
O5	-0.668	-1.149	-0.003
H6	-2.244	0.184	0.068
H7	2.339	-0.101	0.734
H8	1.180	-0.830	-0.114

	H1	O2	O3	C4	O5	H6	H7	H8
H1		1.0379	1.5953	1.9471	2.4094	2.8826	2.2252	1.8821
O2	1.0379		2.5728	1.3545	2.3215	2.0231	3.1731	2.5946
O3	1.5953	2.5728		2.9689	2.7039	4.0495	0.9874	1.0024
C4	1.9471	1.3545	2.9689		1.2559	1.0901	3.5825	2.4969
O5	2.4094	2.3215	2.7039	1.2559		2.0654	3.2690	1.8789
H6	2.8826	2.0231	4.0495	1.0901	2.0654		4.6402	3.5758
H7	2.2252	3.1731	0.9874	3.5825	3.2690	4.6402		1.6109
H8	1.8821	2.5946	1.0024	2.4969	1.8789	3.5758	1.6109

Number	Element	Mulliken
1	H	0.460
2	O	-0.732
3	O	-0.768
4	C	0.614
5	O	-0.634
6	H	0.245
7	H	0.390
8	H	0.425

All results from a given calculation for HCOOHH₂O (Formic acid water dimer)

using model chemistry: MP2_cp/3-21G

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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	x	y	z	Total
	0.458	-0.159	1.687	1.755
CHELPG
AIM
ESP

	x	y	z
x	0.000	0.000	0.000
y	0.000	0.000	0.000
z	0.000	0.000	0.000

<r²>	89.591
(<r²>)^1/2	9.465

All results from a given calculation for HCOOHH2O (Formic acid water dimer)

using model chemistry: MP2_cp/3-21G

States and conformations

All results from a given calculation for HCOOHH₂O (Formic acid water dimer)