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: HF/6-311+G(3df,2pd)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 no    
Energy calculated at HF/6-311+G(3df,2pd)
 hartrees
Energy at 0K-112.442140
Energy at 298.15K-112.447039
Counterpoise corrected energy-56.219552
CP Energy at 298.15K-56.224505
Counterpoise optimized geometry corrected energy 
CP opt. Energy at 298.15K 
Nuclear repulsion energy39.042353
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 HF/6-311+G(3df,2pd)
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3815 3456 10.05      
2 A' 3803 3446 46.21      
3 A' 3692 3345 0.94      
4 A' 3681 3335 22.11      
5 A' 1790 1622 13.49      
6 A' 1783 1615 22.41      
7 A' 1128 1022 107.21      
8 A' 1121 1015 257.94      
9 A' 331 300 41.31      
10 A' 102 92 22.01      
11 A' 58 52 78.11      
12 A" 3817 3459 8.49      
13 A" 3815 3457 3.25      
14 A" 1805 1636 17.74      
15 A" 1788 1620 17.76      
16 A" 212 192 59.02      
17 A" 94 85 37.31      
18 A" 29 26 10.11      

Unscaled Zero Point Vibrational Energy (zpe) 16432.2 cm-1
Scaled (by 0.906) Zero Point Vibrational Energy (zpe) 14887.5 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 HF/6-311+G(3df,2pd)
ABC
4.15647 0.15295 0.15131

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/6-311+G(3df,2pd)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.198 0.827 0.000
N2 -0.027 1.802 0.000
N3 -0.027 -1.694 0.000
H4 0.388 2.219 0.807
H5 0.388 2.219 -0.807
H6 -1.016 -1.553 0.000
H7 0.208 -2.232 -0.808
H8 0.208 -2.232 0.808

Atom - Atom Distances (Å)
  H1 N2 N3 H4 H5 H6 H7 H8
H11.00062.53121.62011.62012.67143.16413.1641
N21.00063.49610.99860.99863.49724.12094.1209
N32.53123.49614.01694.01690.99920.99870.9987
H41.62010.99864.01691.61374.10454.73844.4548
H51.62010.99864.01691.61374.10454.45484.7384
H62.67143.49720.99924.10454.10451.61661.6166
H73.16414.12090.99874.73844.45481.61661.6158
H83.16414.12090.99874.45484.73841.61661.6158

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 108.265 H1 N2 H5 108.265
H1 H3 N6 86.955 H1 H3 H7 121.040
H1 H3 H8 121.040 N2 H1 H3 161.896
H4 N2 H5 107.799 N6 H3 H7 108.023
N6 H3 H8 108.023 H7 H3 H8 107.984
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-311+G(3df,2pd) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.152      
2 N -0.269      
3 N -0.200      
4 H 0.060      
5 H 0.060      
6 H 0.078      
7 H 0.059      
8 H 0.059      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.789 -1.901 0.000 2.058
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -15.794 3.486 0.000
y 3.486 -11.030 0.000
z 0.000 0.000 -12.369
Traceless
 xyz
x -4.095 3.486 0.000
y 3.486 3.052 0.000
z 0.000 0.000 1.043
Polar
3z2-r22.086
x2-y2-4.765
xy3.486
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.469 0.058 0.000
y 0.058 3.843 0.000
z 0.000 0.000 3.343


<r2> (average value of r2) Å2
<r2> 77.963
(<r2>)1/2 8.830