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Table VIII. Comparison of Zero-Point Vibrational Energies (kcal/mol)

Best available

B3LYP/cc-pVTZ

B3LYP/cc-pVTZ

Error in

ZPVE [a]

ZPVE

ZPVE

scaled

Scaled by 0.985

ZPVE

H2

6.21

6.32

6.22

0.01

N2

3.36

3.50

3.45

0.09

O2

2.25

2.33

2.29

0.04

F2

1.30

1.50

1.48

0.18

HF

5.85

5.84

5.76

-0.09

CH

4.04

4.03

3.97

-0.07

CO

3.11

3.16

3.11

0.00

NO

2.71

2.83

2.78

0.07

CS

1.83

1.86

1.84

0.00

SO

1.64

1.64

1.62

-0.02

HCl

4.24

4.20

4.14

-0.10

ClF

1.12

1.12

1.11

-0.01

Cl2

0.80

0.77

0.76

-0.04

HNO

8.56

8.68

8.55

-0.01

CO2

7.24

7.34

7.23

-0.01

H2O

13.25

13.35

13.15

-0.10

H2S

9.40 [b]

9.42

9.28

-0.11

HOCl

8.21 [c]

8.26

8.13

-0.07

OCS

5.72 [d]

5.78

5.70

-0.02

ClCN

5.33 [e]

5.52

5.44

0.11

SO2

4.38 [f]

4.42

4.36

-0.02

CH3

18.44 [g]

18.61

18.33

-0.11

NH3

21.33

21.49

21.17

-0.16

PH3

14.44 [h]

14.96

14.73

0.30

C2H2

16.46

16.94

16.68

0.22

H2CO

16.53

16.65

16.40

-0.13

CH4

27.60

28.00

27.58

-0.02

C2H4

31.60

31.96

31.48

-0.12

a) ZPVE for diatomics were derived from spectroscopic constants in Hub.79, while those

for polyatomics were taken from J. M. L. Martin, J. Molec. Struct. (THEOCHEM)

398-399, 135-144 (1997) [WATOC'96 special issue]. , unless otherwise indicated.

b) I. Kozin and P. Jensen, J. Mol. Spec. 163 (1994) 483.

c) B. Abel, H.H. Hamann, A. A. Kachanov, and J. Troe, J. Chem. Phys. 104 (1996) 3189.

d) Derived from spectroscopic constants in NIST-JANAF Thermochemical Tables, 4th Edition,

Ed. M. W. Chase Jr., J. Phys. Chem. Ref. Data Monograph 9 (1998).

e) T. J. Lee, J. M. L. Martin, C. E. Dateo and P. R. Taylor, J. Phys Chem. 99 (1995) 15858.

f) J. M. L. Martin, J. Chem. Phys. 108 (1998) 2791.

g) Taken from unpublished work of D. W. Schwenke, A. D. Pradhan, and H. Partridge, quoted

in C.W. Bauschlicher and H. Partridge, J. Chem. Phys. 103 (1995) 10589.

h) Quartic force field calculated at CCSD(T)/VQZ+1 level for the purposes of this work.