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 HCN (Hydrogen cyanide)

using model chemistry: PBE1PBE/cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C*V 1Σ
Energy calculated at PBE1PBE/cc-pVDZ
 hartrees
Energy at 0K-93.315736
Energy at 298.15K-93.315874
HF Energy-93.315736
Nuclear repulsion energy23.825768
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 PBE1PBE/cc-pVDZ
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Σ 3490 3355 66.84 25.42 0.25 0.40
2 Σ 2225 2140 2.49 38.24 0.21 0.35
3 Π 778 748 35.11 0.11 0.75 0.86
3 Π 778 748 35.11 0.11 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 3635.9 cm-1
Scaled (by 0.9615) Zero Point Vibrational Energy (zpe) 3495.9 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 PBE1PBE/cc-pVDZ
B
1.47292

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBE1PBE/cc-pVDZ

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -0.501
H2 0.000 0.000 -1.578
N3 0.000 0.000 0.655

Atom - Atom Distances (Å)
  C1 H2 N3
C11.07711.1564
H21.07712.2335
N31.15642.2335

picture of Hydrogen cyanide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 C1 N3 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBE1PBE/cc-pVDZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.001      
2 H 0.113      
3 N -0.114      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 -2.846 2.846
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -11.487 0.000 0.000
y 0.000 -11.487 0.000
z 0.000 0.000 -9.472
Traceless
 xyz
x -1.007 0.000 0.000
y 0.000 -1.007 0.000
z 0.000 0.000 2.015
Polar
3z2-r24.030
x2-y20.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.271 0.000 0.000
y 0.000 1.271 0.000
z 0.000 0.000 2.964


<r2> (average value of r2) Å2
<r2> 13.759
(<r2>)1/2 3.709