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: mPW1PW91/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 mPW1PW91/cc-pVDZ
 hartrees
Energy at 0K-93.400253
Energy at 298.15K-93.400392
HF Energy-93.400253
Nuclear repulsion energy23.846898
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/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 3497 3351 65.69 25.09 0.25 0.40
2 Σ 2227 2134 2.56 38.17 0.21 0.34
3 Π 780 747 35.08 0.13 0.75 0.86
3 Π 780 747 35.08 0.13 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 3641.6 cm-1
Scaled (by 0.9583) Zero Point Vibrational Energy (zpe) 3489.7 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/cc-pVDZ
B
1.47553

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/cc-pVDZ

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 -1.576
N3 0.000 0.000 0.655

Atom - Atom Distances (Å)
  C1 H2 N3
C11.07561.1555
H21.07562.2311
N31.15552.2311

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/cc-pVDZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.005      
2 H 0.113      
3 N -0.118      


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 -2.852 2.852
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -11.458 0.000 0.000
y 0.000 -11.458 0.000
z 0.000 0.000 -9.463
Traceless
 xyz
x -0.997 0.000 0.000
y 0.000 -0.997 0.000
z 0.000 0.000 1.995
Polar
3z2-r23.990
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 1.269 0.000 0.000
y 0.000 1.269 0.000
z 0.000 0.000 2.958


<r2> (average value of r2) Å2
<r2> 13.731
(<r2>)1/2 3.706