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

using model chemistry: CCSD(T)/TZVP

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 CCSD(T)/TZVP
 hartrees
Energy at 0K-412.658203
Energy at 298.15K 
HF Energy-412.503065
Nuclear repulsion energy25.527030
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 CCSD(T)/TZVP
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 597 574        
2 Σu 683 658        
3 Πu 70i 67i        
3 Πu 70i 67i        

Unscaled Zero Point Vibrational Energy (zpe) 570.2 cm-1
Scaled (by 0.9625) Zero Point Vibrational Energy (zpe) 548.9 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 CCSD(T)/TZVP
B
0.27683

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)/TZVP

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 2.083
Li3 0.000 0.000 -2.083

Atom - Atom Distances (Å)
  S1 Li2 Li3
S12.08322.0832
Li22.08324.1664
Li32.08324.1664

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 CCSD(T)/TZVP
 hartrees
Energy at 0K-412.659849
Energy at 298.15K-412.660150
HF Energy-412.501129
Nuclear repulsion energy25.460669
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 CCSD(T)/TZVP
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 595 572        
2 A1 89 86        
3 B2 653 628        

Unscaled Zero Point Vibrational Energy (zpe) 668.4 cm-1
Scaled (by 0.9625) Zero Point Vibrational Energy (zpe) 643.3 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 CCSD(T)/TZVP
ABC
1.47477 0.36896 0.29513

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)/TZVP

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
S1 0.000 0.000 0.295
Li2 0.000 1.804 -0.787
Li3 0.000 -1.804 -0.787

Atom - Atom Distances (Å)
  S1 Li2 Li3
S12.10432.1043
Li22.10433.6089
Li32.10433.6089

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 118.073
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability