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: CCSD=FULL/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 no    
1 2 no    

Conformer 1 ()

Jump to S1C2
Energy calculated at CCSD=FULL/6-31G*
 hartrees
Energy at 0K-112.751979
Energy at 298.15K-112.757442
HF Energy-112.372128
Nuclear repulsion energy40.165668
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 CCSD=FULL/6-31G*
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 3599 3418        
2 Ag 3458 3285        
3 Ag 1760 1671        
4 Ag 1217 1156        
5 Ag 479 455        
6 Ag 150 142        
7 Au 3596 3416 0.27      
8 Au 1774 1685 35.11      
9 Au 255 242 132.68      
10 Au 105 99 30.68      
11 Bg 3596 3415        
12 Bg 1761 1673        
13 Bg 134 127        
14 Bu 3599 3418 12.79      
15 Bu 3461 3287 13.31      
16 Bu 1736 1649 21.95      
17 Bu 1191 1132 376.42      
18 Bu 97 92 310.67      

Unscaled Zero Point Vibrational Energy (zpe) 15983.1 cm-1
Scaled (by 0.9498) Zero Point Vibrational Energy (zpe) 15180.7 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 CCSD=FULL/6-31G*
ABC
4.59597 0.18484 0.18149

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD=FULL/6-31G*

Point Group is C2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.667 0.810 0.000
N2 0.000 1.582 0.000
N3 0.000 -1.582 0.000
H4 0.221 2.155 0.815
H5 0.221 2.155 -0.815
H6 -0.667 -0.810 0.000
H7 -0.221 -2.155 -0.815
H8 -0.221 -2.155 0.815

Atom - Atom Distances (Å)
  H1 N2 N3 H4 H5 H6 H7 H8
H11.02052.48281.63461.63462.09843.19983.1998
N21.02053.16361.02001.02002.48283.83053.8305
N32.48283.16363.83053.83051.02051.02001.0200
H41.63461.02003.83051.62943.19984.62804.3316
H51.63461.02003.83051.62943.19984.33164.6280
H62.09842.48281.02053.19983.19981.63461.6346
H73.19983.83051.02004.62804.33161.63461.6294
H83.19983.83051.02004.33164.62801.63461.6294

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 106.468 H1 N2 H5 106.468
H1 H3 N6 56.423 H1 H3 H7 126.796
H1 H3 H8 126.796 N2 H1 H3 123.577
H4 N2 H5 106.016 N6 H3 H7 106.468
N6 H3 H8 106.468 H7 H3 H8 106.016
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 2 ()

Jump to S1C1
Energy calculated at CCSD=FULL/6-31G*
 hartrees
Energy at 0K-112.751979
Energy at 298.15K-112.757426
HF Energy-112.372136
Nuclear repulsion energy40.174367
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 CCSD=FULL/6-31G*
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' 3599 3418 0.02      
2 A' 3599 3418 12.77      
3 A' 3461 3288 13.46      
4 A' 3459 3285        
5 A' 1759 1671        
6 A' 1736 1649 21.95      
7 A' 1217 1155 0.00      
8 A' 1191 1131 376.98      
9 A' 479 455 0.00      
10 A' 150 143 0.00      
11 A' 96 91 310.73      
12 A" 3598 3417 0.26      
13 A" 3597 3417 0.00      
14 A" 1774 1685 35.15      
15 A" 1761 1673 0.00      
16 A" 254 241 131.69      
17 A" 131 124 0.00      
18 A" 100 95 31.53      

Unscaled Zero Point Vibrational Energy (zpe) 15980.0 cm-1
Scaled (by 0.9498) Zero Point Vibrational Energy (zpe) 15177.8 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 CCSD=FULL/6-31G*
ABC
4.59663 0.18499 0.18163

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD=FULL/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.419 0.712 0.000
N2 -0.012 1.638 0.000
N3 -0.012 -1.572 0.000
H4 0.359 2.129 0.813
H5 0.359 2.129 -0.813
H6 -0.892 -1.057 0.000
H7 -0.038 -2.184 -0.816
H8 -0.038 -2.184 0.816

Atom - Atom Distances (Å)
  H1 N2 N3 H4 H5 H6 H7 H8
H11.02112.32461.63471.63472.20143.04333.0433
N21.02113.21001.02001.02002.83423.90793.9079
N32.32463.21003.80743.80741.02021.01991.0199
H41.63471.02003.80741.62683.51744.62734.3310
H51.63471.02003.80741.62683.51744.33104.6273
H62.20142.83421.02023.51743.51741.63281.6328
H73.04333.90791.01994.62734.33101.63281.6312
H83.04333.90791.01994.33104.62731.63281.6312

picture of Ammonia Dimer state 1 conformation 2
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H1 N2 H4 106.433 H1 N2 H5 106.433
H1 H3 N6 70.309 H1 H3 H7 126.458
H1 H3 H8 126.458 N2 H1 H3 144.350
H4 N2 H5 105.775 N6 H3 H7 106.327
N6 H3 H8 106.327 H7 H3 H8 106.201
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability