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_cp_opt/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 PBEPBE_cp_opt/6-311+G(3df,2pd)
 hartrees
Energy at 0K-56.510042
Energy at 298.15K-56.515181
HF Energy-56.510042
Nuclear repulsion energy11.846817
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_cp_opt/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' 3518 3482 6.50      
2 A' 3466 3431 51.75      
3 A' 3396 3362 4.43      
4 A' 3329 3295 142.78      
5 A' 1621 1605 14.87      
6 A' 1610 1594 14.53      
7 A' 1050 1040 94.84      
8 A' 1036 1025 157.99      
9 A' 379 376 48.41      
10 A' 135 133 20.20      
11 A' 94 93 62.32      
12 A" 3520 3485 5.49      
13 A" 3513 3478 0.81      
14 A" 1642 1626 8.33      
15 A" 1618 1602 19.34      
16 A" 257 255 35.72      
17 A" 121 120 37.75      
18 A" 23 23 13.32      

Unscaled Zero Point Vibrational Energy (zpe) 15163.7 cm-1
Scaled (by 0.99) Zero Point Vibrational Energy (zpe) 15012.0 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 PBEPBE_cp_opt/6-311+G(3df,2pd)
ABC
3.90346 0.17384 0.17194

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.159 0.686 0.000
N2 -0.034 1.696 0.000
N3 -0.034 -1.567 0.000
H4 0.439 2.088 0.816
H5 0.439 2.088 -0.816
H6 -1.056 -1.552 0.000
H7 0.250 -2.107 -0.819
H8 0.250 -2.107 0.819

Atom - Atom Distances (Å)
  H1 N2 N3 H4 H5 H6 H7 H8
H11.02812.26171.64571.64572.54742.91282.9128
N21.02813.26311.02171.02173.40533.90113.9011
N32.26173.26313.77453.77451.02181.02151.0215
H41.64571.02173.77451.63284.01894.50654.1994
H51.64571.02173.77451.63284.01894.19944.5065
H62.54743.40531.02184.01894.01891.63831.6383
H72.91283.90111.02154.50654.19941.63831.6378
H82.91283.90111.02154.19944.50651.63831.6378

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 106.801 H1 N2 H5 106.801
H1 H3 N6 94.094 H1 H3 H7 120.221
H1 H3 H8 120.221 N2 H1 H3 164.222
H4 N2 H5 106.077 N6 H3 H7 106.604
N6 H3 H8 106.604 H7 H3 H8 106.576
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE_cp_opt/6-311+G(3df,2pd) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.000      
2 N 0.000      
3 N -0.281      
4 H 0.000      
5 H 0.000      
6 H 0.094      
7 H 0.093      
8 H 0.093      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.877 -2.263 0.000 2.427
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -16.115 3.221 0.000
y 3.221 -12.467 0.000
z 0.000 0.000 -12.971
Traceless
 xyz
x -3.397 3.221 0.000
y 3.221 2.076 0.000
z 0.000 0.000 1.320
Polar
3z2-r22.640
x2-y2-3.649
xy3.221
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.261 0.128 0.000
y 0.128 1.960 0.000
z 0.000 0.000 1.908


<r2> (average value of r2) Å2
<r2> 70.798
(<r2>)1/2 8.414