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

using model chemistry: B3PW91/3-21G

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 B3PW91/3-21G
 hartrees
Energy at 0K-92.866035
Energy at 298.15K-92.866246
HF Energy-92.866035
Nuclear repulsion energy23.776748
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 B3PW91/3-21G
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 3499 3363 57.81      
2 Σ 2175 2090 0.38      
3 Π 902 867 59.05      
3 Π 902 867 59.02      

Unscaled Zero Point Vibrational Energy (zpe) 3739.0 cm-1
Scaled (by 0.9612) Zero Point Vibrational Energy (zpe) 3593.9 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 B3PW91/3-21G
B
1.46665

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/3-21G

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -0.505
H2 0.000 0.000 -1.570
N3 0.000 0.000 0.657

Atom - Atom Distances (Å)
  C1 H2 N3
C11.06491.1617
H21.06492.2266
N31.16172.2266

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
Charges from optimized geometry at B3PW91/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.069      
2 H 0.335      
3 N -0.403      


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 -2.772 2.772
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -11.398 0.000 0.000
y 0.000 -11.398 0.000
z 0.000 0.000 -9.924
Traceless
 xyz
x -0.737 0.000 0.000
y 0.000 -0.737 0.000
z 0.000 0.000 1.474
Polar
3z2-r22.947
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 0.920 0.000 0.000
y 0.000 0.920 -0.000
z 0.000 -0.000 2.719


<r2> (average value of r2) Å2
<r2> 13.826
(<r2>)1/2 3.718