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 HCCl (Chloromethylene)

using model chemistry: QCISD/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
2 1 yes CS 3A"

State 1 (1A')

Jump to S2C1
Energy calculated at QCISD/3-21G
 hartrees
Energy at 0K-495.529055
Energy at 298.15K-495.528811
HF Energy-495.382831
Nuclear repulsion energy34.800492
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/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' 2745 2660 105.89      
2 A' 1199 1162 7.85      
3 A' 586 568 82.05      

Unscaled Zero Point Vibrational Energy (zpe) 2265.1 cm-1
Scaled (by 0.9692) Zero Point Vibrational Energy (zpe) 2195.4 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/3-21G
ABC
14.74624 0.47671 0.46178

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.047 1.350 0.000
Cl2 0.047 -0.565 0.000
H3 -1.071 1.513 0.000

Atom - Atom Distances (Å)
  C1 Cl2 H3
C11.91551.1298
Cl21.91552.3602
H31.12982.3602

picture of Chloromethylene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Cl2 C1 H3 98.300
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

State 2 (3A")

Jump to S1C1
Energy calculated at QCISD/3-21G
 hartrees
Energy at 0K-495.534602
Energy at 298.15K-495.534375
HF Energy-495.416448
Nuclear repulsion energy36.053322
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/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' 3174 3077 3.66      
2 A' 955 925 0.39      
3 A' 684 663 34.73      

Unscaled Zero Point Vibrational Energy (zpe) 2406.2 cm-1
Scaled (by 0.9692) Zero Point Vibrational Energy (zpe) 2332.1 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/3-21G
ABC
22.91469 0.50424 0.49338

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.038 1.265 0.000
Cl2 0.038 -0.555 0.000
H3 -0.879 1.852 0.000

Atom - Atom Distances (Å)
  C1 Cl2 H3
C11.82061.0893
Cl21.82062.5767
H31.08932.5767

picture of Chloromethylene state 2 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Cl2 C1 H3 122.621
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability