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

using model chemistry: QCISD(TQ)/aug-cc-pVDZ

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(TQ)/aug-cc-pVDZ
 hartrees
Energy at 0K-412.687396
Energy at 298.15K 
HF Energy-412.508001
Nuclear repulsion energy25.003708
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(TQ)/aug-cc-pVDZ
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 554 554        
2 Σu 647 647        
3 Πu 84i 84i        
3 Πu 84i 84i        

Unscaled Zero Point Vibrational Energy (zpe) 517.3 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 517.3 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(TQ)/aug-cc-pVDZ
B
0.26559

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

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 2.127
Li3 0.000 0.000 -2.127

Atom - Atom Distances (Å)
  S1 Li2 Li3
S12.12682.1268
Li22.12684.2536
Li32.12684.2536

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(TQ)/aug-cc-pVDZ
 hartrees
Energy at 0K-412.688487
Energy at 298.15K-412.688702
HF Energy-412.508305
Nuclear repulsion energy25.022604
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(TQ)/aug-cc-pVDZ
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 560 560        
2 A1 60 60        
3 B2 632 632        

Unscaled Zero Point Vibrational Energy (zpe) 625.7 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 625.7 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 QCISD(TQ)/aug-cc-pVDZ
ABC
2.32638 0.31517 0.27756

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
S1 0.000 0.000 0.235
Li2 0.000 1.952 -0.627
Li3 0.000 -1.952 -0.627

Atom - Atom Distances (Å)
  S1 Li2 Li3
S12.13422.1342
Li22.13423.9048
Li32.13423.9048

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 132.356
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability