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All results from a given calculation for Li2S (dilithium sulfide)

using model chemistry: QCISD/aug-cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 no D*H 1Σg
1 2 yes C2V 1A1

Conformer 1 (D*H)

Jump to S1C2
Energy calculated at QCISD/aug-cc-pVTZ
 hartrees
Energy at 0K-412.738406
Energy at 298.15K 
HF Energy-412.523158
Nuclear repulsion energy25.460383
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 QCISD/aug-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 Σg 584 562 0.00      
2 Σu 675 649 309.31      
3 Πu 30i 29i 135.72      
3 Πu 30i 29i 135.72      

Unscaled Zero Point Vibrational Energy (zpe) 599.9 cm-1
Scaled (by 0.9624) Zero Point Vibrational Energy (zpe) 577.3 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 QCISD/aug-cc-pVTZ
B
0.27534

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/aug-cc-pVTZ

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
S1 0.000 0.000 0.000
Li2 0.000 0.000 2.089
Li3 0.000 0.000 -2.089

Atom - Atom Distances (Å)
  S1 Li2 Li3
S12.08882.0888
Li22.08884.1777
Li32.08884.1777

picture of dilithium sulfide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Li2 S1 Li3 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (C2V)

Jump to S1C1
Energy calculated at QCISD/aug-cc-pVTZ
 hartrees
Energy at 0K-412.738579
Energy at 298.15K-412.738796
HF Energy-412.522775
Nuclear repulsion energy25.424806
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 QCISD/aug-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 584 562 16.71      
2 A1 45 43 114.35      
3 B2 662 637 244.21      

Unscaled Zero Point Vibrational Energy (zpe) 645.5 cm-1
Scaled (by 0.9624) Zero Point Vibrational Energy (zpe) 621.3 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 QCISD/aug-cc-pVTZ
ABC
3.24585 0.31051 0.28340

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/aug-cc-pVTZ

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
S1 0.000 0.000 0.199
Li2 0.000 1.967 -0.531
Li3 0.000 -1.967 -0.531

Atom - Atom Distances (Å)
  S1 Li2 Li3
S12.09802.0980
Li22.09803.9339
Li32.09803.9339

picture of dilithium sulfide state 1 conformation 2
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Li2 S1 Li3 139.289
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability