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

using model chemistry: mPW1PW91/6-31G**

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 mPW1PW91/6-31G**
 hartrees
Energy at 0K-93.393642
Energy at 298.15K-93.393779
HF Energy-93.393642
Nuclear repulsion energy23.887230
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 mPW1PW91/6-31G**
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 3502 3333 59.73 25.58 0.22 0.36
2 Σ 2239 2130 2.46 34.93 0.24 0.39
3 Π 780 742 37.96 0.09 0.75 0.86
3 Π 780 742 37.96 0.09 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 3650.5 cm-1
Scaled (by 0.9515) Zero Point Vibrational Energy (zpe) 3473.5 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 mPW1PW91/6-31G**
B
1.48046

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/6-31G**

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -0.501
H2 0.000 0.000 -1.569
N3 0.000 0.000 0.654

Atom - Atom Distances (Å)
  C1 H2 N3
C11.06831.1546
H21.06832.2230
N31.15462.2230

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 mPW1PW91/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.141      
2 H 0.241      
3 N -0.382      


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 -2.937 2.937
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -11.387 0.000 0.000
y 0.000 -11.387 0.000
z 0.000 0.000 -9.451
Traceless
 xyz
x -0.968 0.000 0.000
y 0.000 -0.968 0.000
z 0.000 0.000 1.936
Polar
3z2-r23.871
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 1.154 0.000 0.000
y 0.000 1.154 0.000
z 0.000 0.000 2.962


<r2> (average value of r2) Å2
<r2> 13.669
(<r2>)1/2 3.697