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 CaO (Calcium monoxide)

22 02 02 11 45
Other names
Calcium oxide; Lime; Calcia; Calx;
INChI INChIKey SMILES IUPAC name
InChI=1S/Ca.O ODINCKMPIJJUCX-UHFFFAOYSA-N [Ca]=O Calcium oxide
State Conformation
1Σ C*V
Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp)
Property Value Uncertainty units Reference Comment
Hfg(298.15K) enthalpy of formation 38.01 10.00 kJ mol-1 Gurvich
Hfg(0K) enthalpy of formation 39.13 10.00 kJ mol-1 Gurvich
Entropy (298.15K) entropy 219.72   J K-1 mol-1 Gurvich
Integrated Heat Capacity (0 to 298.15K) integrated heat capacity 8.95   kJ mol-1 Gurvich
Heat Capacity (298.15K) heat capacity 32.45   J K-1 mol-1 Gurvich
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 Σ 723 732 1979HUB/HER       omexe=4.8

vibrational zero-point energy: 361.3 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for CaO (Calcium monoxide).
More spectroscopic constants are available at the NIST Physics Laboratory website:
http://physics.nist.gov/PhysRefData/MolSpec/Diatomic/Html/Tables/CaO.html
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
  0.44450 0.44450 1979HUB/HER

Calculated rotational constants for CaO (Calcium monoxide).
Product of moments of inertia moments of inertia
37.92493amu Å2   6.297681E-39gm cm2
Geometric Data
picture of Calcium monoxide

Point Group C∞v


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
rOCa 1.822   1 2 1979HUB/HER re

Cartesians
Atom x (Å) y (Å) z (Å)
Ca1 0.0000 0.0000 0.0000
O2 0.0000 0.0000 1.8221

Atom - Atom Distances bond lengths
Distances in Å
  Ca1 O2
Ca1   1.8221
O2 1.8221  

Calculated geometries for CaO (Calcium monoxide).

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
O-Ca 1

Connectivity
Atom 1 Atom 2
Ca1 O2
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 1   1Σ
8094 6 Gurvich
8433 2 Gurvich
10500 3 Gurvich
11555.5 1 Gurvich
25500 6 Gurvich
25991 2 Gurvich

Ionization Energies (eV)
Ionization Energy I.E. unc. vertical I.E. v.I.E. unc. reference
6.660 0.180     webbook
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 1Σ C∞v True           C∞v 1 1
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 CaO (Calcium monoxide).
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 1Σ C∞v True       C∞v 1 1

Calculated electric quadrupole moments for CaO (Calcium monoxide).
Electric dipole polarizability (Å3) polarizability
alpha unc. Reference
2.841   1998Gus/Rui:163

Calculated electric dipole polarizability for CaO (Calcium monoxide).

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 cccbdb@nist.gov.
squib reference DOI
1979HUB/HER Huber, K.P.; Herzberg, G., Molecular Spectra and Molecular Structure. IV. Constants of Diatomic Molecules, Van Nostrand Reinhold Co., 1979 10.1007/978-1-4757-0961-2
1998Gus/Rui:163 M Gussoni, R Rui, G Zerbi "Electronic and relaxation contribution to linear molecular polarizability. An analysis of the experimental values" J. Mol. Struct. 447 (1998) 163-215 10.1016/S0022-2860(97)00292-5
Gurvich Gurvich, L.V.; Veyts, I. V.; Alcock, C. B., Thermodynamic Properties of Individual Substances, Fouth Edition, Hemisphere Pub. Co., New York, 1989  
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

Got a better number? Please email us at cccbdb@nist.gov


Browse
PreviousNext