return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for HCN (Hydrogen cyanide)

using model chemistry: MP2/SDD

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 MP2/SDD
 hartrees
Energy at 0K-93.050817
Energy at 298.15K-93.050905
HF Energy-92.828283
Nuclear repulsion energy22.921895
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 MP2/SDD
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 3461 3341 51.35 42.34 0.20 0.34
2 Σ 1845 1781 1.53 24.25 0.20 0.33
3 Π 723 698 60.99 0.58 0.75 0.86
3 Π 723 698 60.99 0.58 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 3375.8 cm-1
Scaled (by 0.9653) Zero Point Vibrational Energy (zpe) 3258.7 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 MP2/SDD
B
1.36201

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/SDD

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -0.529
H2 0.000 0.000 -1.603
N3 0.000 0.000 0.682

Atom - Atom Distances (Å)
  C1 H2 N3
C11.07431.2115
H21.07432.2857
N31.21152.2857

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

Electronic state

Charges, Dipole, Quadrupole and Polarizability