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 NH3NH3 (Ammonia Dimer)

using model chemistry: PBEPBE/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 no    
Energy calculated at PBEPBE/3-21G*
 hartrees
Energy at 0K-112.319343
Energy at 298.15K-112.325601
HF Energy-112.319343
Counterpoise corrected energy 
CP Energy at 298.15K 
Counterpoise optimized geometry corrected energy 
CP opt. Energy at 298.15K 
Nuclear repulsion energy41.757761
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 PBEPBE/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 Ag 3389 3232 0.00      
2 Ag 3193 3044 0.00      
3 Ag 1711 1632 0.00      
4 Ag 1045 996 0.00      
5 Ag 622 593 0.00      
6 Ag 246 234 0.00      
7 Au 3443 3283 4.19      
8 Au 1747 1666 26.15      
9 Au 390 371 88.59      
10 Au 172 164 46.48      
11 Bg 3441 3281 0.00      
12 Bg 1731 1651 0.00      
13 Bg 252 240 0.00      
14 Bu 3390 3233 36.05      
15 Bu 3226 3076 203.92      
16 Bu 1667 1589 10.60      
17 Bu 848 808 480.67      
18 Bu 216 206 460.26      

Unscaled Zero Point Vibrational Energy (zpe) 15363.5 cm-1
Scaled (by 0.9535) Zero Point Vibrational Energy (zpe) 14649.1 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 PBEPBE/3-21G*
ABC
4.51152 0.22801 0.22204

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

Point Group is C2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.647 0.603 0.000
N2 0.000 1.417 0.000
N3 0.000 -1.417 0.000
H4 0.146 1.995 0.842
H5 0.146 1.995 -0.842
H6 -0.647 -0.603 0.000
H7 -0.146 -1.995 -0.842
H8 -0.146 -1.995 0.842

Atom - Atom Distances (Å)
  H1 N2 N3 H4 H5 H6 H7 H8
H11.03942.12081.70261.70261.76822.84442.8444
N21.03942.83371.03241.03242.12083.51783.5178
N32.12082.83373.51783.51781.03941.03241.0324
H41.70261.03243.51781.68492.84444.34194.0017
H51.70261.03243.51781.68492.84444.00174.3419
H61.76822.12081.03942.84442.84441.70261.7026
H72.84443.51781.03244.34194.00171.70261.6849
H82.84443.51781.03244.00174.34191.70261.6849

picture of Ammonia Dimer state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H1 N2 H4 110.527 H1 N2 H5 110.527
H1 H3 N6 56.215 H1 H3 H7 125.238
H1 H3 H8 125.238 N2 H1 H3 123.785
H4 N2 H5 109.368 N6 H3 H7 110.527
N6 H3 H8 110.527 H7 H3 H8 109.368
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.285      
2 N -0.800      
3 N -0.800      
4 H 0.257      
5 H 0.257      
6 H 0.285      
7 H 0.257      
8 H 0.257      


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 -16.102 3.477 0.000
y 3.477 -8.647 0.000
z 0.000 0.000 -11.871
Traceless
 xyz
x -5.842 3.477 0.000
y 3.477 5.339 0.000
z 0.000 0.000 0.503
Polar
3z2-r21.006
x2-y2-7.454
xy3.477
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.168 -0.044 0.000
y -0.044 3.723 0.000
z 0.000 0.000 2.521


<r2> (average value of r2) Å2
<r2> 56.144
(<r2>)1/2 7.493