return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Experimental > One molecule all properties

Experimental data for H2O+ (water cation)

22 02 02 11 45
INChI INChIKey SMILES IUPAC name
InChI=1S/H2O/h1H2/q+1 RECVMTHOQWMYFX-UHFFFAOYSA-N [OH2+]
State Conformation
2B1 C2V
Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp)
Property Value Uncertainty units Reference Comment
Information can also be found for this species in the NIST Chemistry Webbook
Vibrational levels (cm-1) vibrations
Mode Number Symmetry Frequency Intensity Comment Description
Fundamental(cm-1) Harmonic(cm-1) Reference (km mol-1) unc. Reference
1 A1 3213   webbook      
2 A1 1408   webbook      
3 B2 3259   webbook      

vibrational zero-point energy: 3940.2 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for H2O+ (water cation).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
29.03590 12.42298 8.46921 1992Hue/Pur:5977 B0

Calculated rotational constants for H2O+ (water cation).
Product of moments of inertia moments of inertia
1.568143amu3Å6   7.18048184371233E-120gm3 cm6
Geometric Data
picture of water cation

Point Group C2v


Internal coordinates
distances (r) in Å, angles (a) in degrees, dihedrals (d) in degrees
Description Value unc. Connectivity Reference Comment
Atom 1 Atom 2 Atom 3 Atom 4
rOH 0.999 0.001 1 2 1992Hue/Pur:5977
aHOH 109.3 0.1 2 1 3 1992Hue/Pur:5977

Cartesians
Atom x (Å) y (Å) z (Å)
O1 0.0000 0.0000 0.1156
H2 0.0000 0.8150 -0.4625
H3 0.0000 -0.8150 -0.4625

Atom - Atom Distances bond lengths
Distances in Å
  O1 H2 H3
O1   0.99920.9992
H2 0.9992   1.6300
H3 0.99921.6300  

Calculated geometries for H2O+ (water cation).

Experimental Bond Angles (degrees) from cartesians bond angles

atom1 atom2 atom3 angle
H2 O1 H3 109.300

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-O 2

Connectivity
Atom 1 Atom 2
O1 H2
O1 H3
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 2   2B1
Dipole, Quadrupole and Polarizability
Electric dipole moment dipole
State Config State description Conf description Exp. min. Dipole (Debye) Reference comment Point Group Components
x y z total dipole quadrupole
1 1 2B1 C2v True           C2v 1 2
Experimental dipole measurement abbreviations: MW microwave; DT Dielectric with Temperature variation; DR Indirect (usually an upper limit); MB Molecular beam
Calculated electric dipole moments for H2O+ (water cation).
Electric quadrupole moment quadrupole
State Config State description Conf description Exp. min. Quadrupole (D Å) Reference comment Point Group Components
xx yy zz dipole quadrupole
1 1 2B1 C2v True       C2v 1 2

Calculated electric quadrupole moments for H2O+ (water cation).

References
By selecting the following links, you may be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to [email protected].
squib reference DOI
1992Hue/Pur:5977 TR Huet, CJ Pursell, WC Ho, BM Dinelli, and T Oka "Infrared spectroscopy and equilibrium structure of H2O + (X̃ 2B1)" J. Chem. Phys. 97, 5977 (1992) 10.1063/1.463735
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

Got a better number? Please email us at [email protected]


Browse
PreviousNext