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All results from a given calculation for HCN (Hydrogen cyanide)

using model chemistry: CISD/3-21G

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 CISD/3-21G
 hartrees
Energy at 0K-92.550910
Energy at 298.15K-92.551101
HF Energy-92.352124
Nuclear repulsion energy23.744996
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 CISD/3-21G
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 3513 3307 52.74      
2 Σ 2179 2051 0.40      
3 Π 864 814 53.91      
3 Π 864 814 53.91      

Unscaled Zero Point Vibrational Energy (zpe) 3710.2 cm-1
Scaled (by 0.9413) Zero Point Vibrational Energy (zpe) 3492.4 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 CISD/3-21G
B
1.46268

See section I.F.4 to change rotational constant units
Geometric Data calculated at CISD/3-21G

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -0.506
H2 0.000 0.000 -1.570
N3 0.000 0.000 0.658

Atom - Atom Distances (Å)
  C1 H2 N3
C11.06421.1637
H21.06422.2279
N31.16372.2279

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