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 H2S2 (Disulfane)

using model chemistry: mPW1PW91/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2 1A
Energy calculated at mPW1PW91/3-21G
 hartrees
Energy at 0K-793.635073
Energy at 298.15K-793.636979
HF Energy-793.635073
Nuclear repulsion energy78.333780
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 mPW1PW91/3-21G
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 2490 2377 16.85      
2 A 843 805 0.76      
3 A 441 421 0.14      
4 A 341 326 35.41      
5 B 2490 2377 21.30      
6 B 823 786 1.53      

Unscaled Zero Point Vibrational Energy (zpe) 3714.5 cm-1
Scaled (by 0.9546) Zero Point Vibrational Energy (zpe) 3545.9 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 mPW1PW91/3-21G
ABC
4.64261 0.19321 0.19256

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/3-21G

Point Group is C2

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
S1 0.000 1.134 -0.054
S2 0.000 -1.134 -0.054
H3 1.007 1.276 0.870
H4 -1.007 -1.276 0.870

Atom - Atom Distances (Å)
  S1 S2 H3 H4
S12.26791.37392.7707
S22.26792.77071.3739
H31.37392.77073.2511
H42.77071.37393.2511

picture of Disulfane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
S1 S2 H4 95.948 S2 S1 H3 95.948
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 S -0.122      
2 S -0.122      
3 H 0.122      
4 H 0.122      


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 1.906 1.906
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -27.372 3.039 0.000
y 3.039 -27.414 0.000
z 0.000 0.000 -28.208
Traceless
 xyz
x 0.439 3.039 0.000
y 3.039 0.376 0.000
z 0.000 0.000 -0.815
Polar
3z2-r2-1.630
x2-y20.042
xy3.039
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.208 0.579 0.000
y 0.579 7.668 0.000
z 0.000 0.000 2.886


<r2> (average value of r2) Å2
<r2> 65.317
(<r2>)1/2 8.082