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 NH4 (Ammonium radical)

using model chemistry: mPW1PW91/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes TD 2A1
Energy calculated at mPW1PW91/3-21G*
 hartrees
Energy at 0K-56.683177
Energy at 298.15K 
HF Energy-56.683177
Nuclear repulsion energy15.075787
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 mPW1PW91/3-21G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 2496 2370 0.00 190.46 0.00 0.00
2 E 1306 1240 0.00 165.40 0.75 0.86
2 E 1306 1240 0.00 165.40 0.75 0.86
3 T2 1534 1457 1353.84 1930.07 0.75 0.86
3 T2 1534 1457 1353.84 1930.07 0.75 0.86
3 T2 1534 1457 1353.84 1930.07 0.75 0.86
4 T2 556i 528i 2780.64 3904.52 0.75 0.86
4 T2 556i 528i 2780.64 3904.52 0.75 0.86
4 T2 556i 528i 2780.64 3904.52 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 4021.7 cm-1
Scaled (by 0.9496) Zero Point Vibrational Energy (zpe) 3819.0 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 mPW1PW91/3-21G*
ABC
5.07444 5.07444 5.07444

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/3-21G*

Point Group is Td

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 0.000
H2 0.642 0.642 0.642
H3 -0.642 -0.642 0.642
H4 -0.642 0.642 -0.642
H5 0.642 -0.642 -0.642

Atom - Atom Distances (Å)
  N1 H2 H3 H4 H5
N11.11181.11181.11181.1118
H21.11181.81561.81561.8156
H31.11181.81561.81561.8156
H41.11181.81561.81561.8156
H51.11181.81561.81561.8156

picture of Ammonium radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 N1 H3 109.471 H2 N1 H4 109.471
H2 N1 H5 109.471 H3 N1 H4 109.471
H3 N1 H5 109.471 H4 N1 H5 109.471
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.587      
2 H 0.147      
3 H 0.147      
4 H 0.147      
5 H 0.147      


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 0.000 0.000
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -9.362 0.000 0.000
y 0.000 -9.362 0.000
z 0.000 0.000 -9.362
Traceless
 xyz
x 0.000 0.000 0.000
y 0.000 0.000 0.000
z 0.000 0.000 0.000
Polar
3z2-r20.000
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 5.006 0.000 0.000
y 0.000 5.006 0.000
z 0.000 0.000 5.006


<r2> (average value of r2) Å2
<r2> 10.792
(<r2>)1/2 3.285