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: QCISD/daug-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 QCISD/daug-cc-pVDZ
 hartrees
Energy at 0K-93.192998
Energy at 298.15K-93.193089
HF Energy-92.885389
Nuclear repulsion energy23.588016
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 QCISD/daug-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 3434 3434 60.57      
2 Σ 2125 2125 0.33      
3 Π 715 715 36.32      
3 Π 715 715 36.32      

Unscaled Zero Point Vibrational Energy (zpe) 3494.6 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 3494.6 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 QCISD/daug-cc-pVDZ
B
1.44357

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -0.508
H2 0.000 0.000 -1.587
N3 0.000 0.000 0.662

Atom - Atom Distances (Å)
  C1 H2 N3
C11.07901.1699
H21.07902.2489
N31.16992.2489

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