return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for NH3 (Ammonia)

using model chemistry: B2PLYP=FULL/cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at B2PLYP=FULL/cc-pVTZ
 hartrees
Energy at 0K-56.537196
Energy at 298.15K-56.539861
HF Energy-56.457299
Nuclear repulsion energy11.968282
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 B2PLYP=FULL/cc-pVTZ
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 3494 3340 1.98 125.21 0.04 0.08
2 A1 1078 1031 149.23 4.14 0.07 0.13
3 E 3618 3458 1.17 43.28 0.75 0.86
3 E 3618 3458 1.17 43.28 0.75 0.86
4 E 1690 1615 16.40 4.46 0.75 0.86
4 E 1690 1615 16.40 4.46 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 7593.8 cm-1
Scaled (by 0.9558) Zero Point Vibrational Energy (zpe) 7258.2 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 B2PLYP=FULL/cc-pVTZ
ABC
9.97133 9.97133 6.37475

See section I.F.4 to change rotational constant units
Geometric Data calculated at B2PLYP=FULL/cc-pVTZ

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 0.115
H2 0.000 0.935 -0.269
H3 0.810 -0.468 -0.269
H4 -0.810 -0.468 -0.269

Atom - Atom Distances (Å)
  N1 H2 H3 H4
N11.01131.01131.0113
H21.01131.61981.6198
H31.01131.61981.6198
H41.01131.61981.6198

picture of Ammonia state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 N1 H3 106.423 H2 N1 H4 106.423
H3 N1 H4 106.423
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability