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: Calculated > Energy > Optimized > Energy

All results from a given calculation for HNCO (Isocyanic acid)

using model chemistry: HF/aug-cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at HF/aug-cc-pVDZ
 hartrees
Energy at 0K-167.792475
Energy at 298.15K-167.793618
Nuclear repulsion energy59.997699
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at HF/aug-cc-pVDZ
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A' 3863 3518 183.05      
2 A' 2431 2213 1164.30      
3 A' 1431 1303 0.15      
4 A' 924 841 236.97      
5 A' 611 556 118.76      
6 A" 718 654 18.20      

Unscaled Zero Point Vibrational Energy (zpe) 4988.5 cm-1
Scaled (by 0.9106) Zero Point Vibrational Energy (zpe) 4542.5 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at HF/aug-cc-pVDZ
ABC
26.80746 0.37960 0.37430

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/aug-cc-pVDZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.927 -1.638 0.000
N2 0.051 -1.157 0.000
C3 0.000 0.048 0.000
O4 -0.161 1.181 0.000

Atom - Atom Distances (Å)
  H1 N2 C3 O4
H10.99891.92433.0218
N20.99891.20662.3480
C31.92431.20661.1443
O43.02182.34801.1443

picture of Isocyanic acid state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H1 N2 C3 121.216 N2 C3 O4 174.361
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/aug-cc-pVDZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.069 0.000    
2 N -0.133 0.000    
3 C 0.398 0.000    
4 O -0.334 0.000    


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  1.698 -1.198 0.000 2.078
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -14.814 -2.472 0.000
y -2.472 -18.821 0.000
z 0.000 0.000 -16.876
Traceless
 xyz
x 3.035 -2.472 0.000
y -2.472 -2.976 0.000
z 0.000 0.000 -0.059
Polar
3z2-r2-0.118
x2-y24.007
xy-2.472
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.321 -0.311 0.000
y -0.311 4.638 0.000
z 0.000 0.000 2.224


<r2> (average value of r2) Å2
<r2> 34.834
(<r2>)1/2 5.902