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

using model chemistry: MP2/CEP-31G

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/CEP-31G
 hartrees
Energy at 0K-15.866412
Energy at 298.15K-15.866493
HF Energy-15.662637
Nuclear repulsion energy11.744756
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/CEP-31G
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 3422 3306 32.38 45.88 0.22 0.36
2 Σ 1822 1760 2.75 26.66 0.23 0.37
3 Π 713 689 75.47 1.02 0.75 0.86
3 Π 713 689 75.47 1.02 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 3334.7 cm-1
Scaled (by 0.9663) Zero Point Vibrational Energy (zpe) 3222.4 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 MP2/CEP-31G
B
1.33443

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -0.535
H2 0.000 0.000 -1.618
N3 0.000 0.000 0.690

Atom - Atom Distances (Å)
  C1 H2 N3
C11.08361.2243
H21.08362.3078
N31.22432.3078

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