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 MgH2 (magnesium dihydride)

using model chemistry: B3LYP/SDD

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D*H 1Σg
Energy calculated at B3LYP/SDD
 hartrees
Energy at 0K-201.241965
Energy at 298.15K-201.243219
HF Energy-201.241965
Nuclear repulsion energy7.555774
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 B3LYP/SDD
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Σg 1585 1524 0.00      
2 Σu 1626 1563 292.74      
3 Πu 481 462 345.40      
3 Πu 481 462 345.40      

Unscaled Zero Point Vibrational Energy (zpe) 2086.2 cm-1
Scaled (by 0.9613) Zero Point Vibrational Energy (zpe) 2005.5 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 B3LYP/SDD
B
2.84057

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/SDD

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Mg1 0.000 0.000 0.000
H2 0.000 0.000 1.716
H3 0.000 0.000 -1.716

Atom - Atom Distances (Å)
  Mg1 H2 H3
Mg11.71591.7159
H21.71593.4318
H31.71593.4318

picture of magnesium dihydride state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 Mg1 H3 180.000
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/SDD Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Mg 0.312      
2 H -0.156      
3 H -0.156      


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 -10.840 0.000 0.000
y 0.000 -10.840 0.000
z 0.000 0.000 -22.356
Traceless
 xyz
x 5.758 0.000 0.000
y 0.000 5.758 0.000
z 0.000 0.000 -11.516
Polar
3z2-r2-23.031
x2-y20.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.274 0.000 0.000
y 0.000 3.274 0.000
z 0.000 0.000 4.757


<r2> (average value of r2) Å2
<r2> 15.057
(<r2>)1/2 3.880