Keywords in the Jaguar Input File That Specify Physical Properties

The keywords that specify physical properties of atoms are listed and defined in Table 1. Values for these keywords can appear in restart files.

Table 1. Keywords for physical properties in the atomic section

Keyword

Description

isotope

Isotopic number (integer, e.g., 2 for deuterium); overridden by atom’s mass setting if it exists

mass

Nuclear mass in amu

esp

Electrostatic potential fitted point charge (or request to fit charge to dummy atom; see text)

formal

Formal charge (integer value) on atom

multip

Spin multiplicity of atom (or fragment containing atom)

2spin

Number of unpaired alpha or beta electrons on atom; positive value for alpha spin, negative value for beta spin.

mulk

Mulliken population

vdw

van der Waals radii (in Å) for charge fitting

vdw2

van der Waals radii (in Å) for PBF solvation. Not applicable to SM6 or SM8 solvation.

cov

Covalent radius in Å (used to determine bonding and other properties)

The formal keyword is useful for solvation jobs (because the van der Waals radii are adjusted according to the chemical structure found by Jaguar) and for generating an improved initial guess for transition-metal-containing systems (along with the multip keyword). See Initial Guess Orbitals for Molecules Containing Transition Metals for more information on using this improved initial guess method.

The esp keyword can be used to freeze the charge on an atom to a particular value while fitting charges to other atoms, leave an atom out of charge fitting, or fit a charge to a dummy atom. If the esp column entry for an atom is set to a real number, the atomic charge for that atom is held fixed to that number during charge fitting. If the esp column entry for an atom is set to "n" or "no" (or 0), the atom is not included in charge fitting. If the esp column entry for a dummy atom is "y" or "yes", it is included in the charge fit.

Several warnings apply to the use of the esp column. First, the esp settings must not be inconsistent with the symmetry used for the rest of the job. Second, you should be careful not to overconstrain the charge fitting job. Third, if you are including any dummy atoms in the charge fitting, it may be advisable to perform the charge fitting in a separate job (based on the restart file) for which the charge fitting grid has been altered to include points around the dummy atoms by including a grid column in the atomic section, with "y" or "yes" entries for the dummy atoms, as described below.

The van der Waals surface used for charge fitting is constructed using DREIDING [108] van der Waals radii for hydrogen and for carbon through argon, and universal force field [105] van der Waals radii for all other elements. These radii are listed in Table 2, and can be changed using the vdw keyword.

Table 2. Van der Waals radii (in Angstroms) used in calculation of electrostatic potential (ESP) fitted charges

10

H

1.597

 

20

He

1.181

30

Li

1.226

40

Be

1.373

 

50

B

2.042

60

C

1.949

70

N

1.831

80

O

1.702

90

F

1.736

10

Ne

1.736

11

Na

2.308

12

Mg

2.308

 

13

Al

2.308

14

Si

2.217

15

P

2.147

16

S

2.070

17

Cl

1.958

18

Ar

1.958

19

K

1.906

20

Ca

1.700

21

Sc

1.647

22

Ti

1.587

23

V

1.572

24

Cr

1.511

25

Mn

1.480

26

Fe

1.456

27

Co

1.436

28

Ni

1.417

29

Cu

1.748

30

Zn

1.381

31

Ga

2.192

32

Ge

2.140

33

As

2.115

34

Se

2.103

35

Br

2.095

36

Kr

2.071

37

Rb

2.057

38

Sr

1.821

39

Y

1.673

40

Zr

1.562

41

Nb

1.583

42

Mo

1.526

43

Tc

1.499

44

Ru

1.481

45

Rh

1.464

46

Pd

1.450

47

Ag

1.574

48

Cd

1.424

49

In

2.232

50

Sn

2.196

51

Sb

2.210

52

Te

2.235

53

I

2.250

54

Xe

2.202

55

Cs

2.259

56

Ba

1.851

57

La

1.761

72

Hf

1.570

73

Ta

1.585

74

W

1.534

75

Re

1.477

76

Os

1.560

77

Ir

1.420

78

Pt

1.377

79

Au

1.647

80

Hg

1.353

81

Tl

2.174

82

Pb

2.148

83

Bi

2.185

84

Po

 

85

At

 

86

Rn

 

The van der Waals radii for PBF solvation calculations are listed in Table 3, and can be changed using the vdw2 keyword. The radii for the elements H, C, N, O, F, P, Cl, Br, and I can be adjusted by Jaguar in some functional groups. See The PBF Radii File for Jaguar Calculations for more information on how Jaguar uses these radii in solvation calculations.

Table 3. Van der Waals Radii (in Angstroms) for PBF solvation calculations (Radii can be reassigned for atoms whose radius values below are shown in bold italics, since Jaguar generally adjusts radii for atoms in certain functional groups. See Jaguar Solvation Settings, The PBF Radii File for Jaguar Calculations, and the default.lewis data file for more information on van der Waals radius assignments for solvation calculations.)

10

H

1.150

 

20

He

1.181

30

Li

1.226

40

Be

1.373

 

50

B

2.042

60

C

1.900

70

N

1.600

80

O

1.600

90

F

1.682

10

Ne

1.621

11

Na

1.491

12

Mg

1.510

 

13

Al

2.249

14

Si

2.147

15

P

2.074

16

S

1.900

17

Cl

1.974

18

Ar

1.934

19

K

1.906

20

Ca

1.700

21

Sc

1.647

22

Ti

1.587

23

V

1.572

24

Cr

1.511

25

Mn

1.480

26

Fe

1.456

27

Co

1.436

28

Ni

1.417

29

Cu

1.748

30

Zn

1.381

31

Ga

2.192

32

Ge

2.140

33

As

2.115

34

Se

2.103

35

Br

2.095

36

Kr

2.071

37

Rb

2.057

38

Sr

1.821

39

Y

1.673

40

Zr

1.562

41

Nb

1.583

42

Mo

1.526

43

Tc

1.499

44

Ru

1.481

45

Rh

1.464

46

Pd

1.450

47

Ag

1.574

48

Cd

1.424

49

In

2.232

50

Sn

2.196

51

Sb

2.210

52

Te

2.235

53

I

2.250

54

Xe

2.202

55

Cs

2.259

56

Ba

1.851

57

La

1.761

72

Hf

1.570

73

Ta

1.585

74

W

1.534

75

Re

1.477

76

Os

1.560

77

Ir

1.420

78

Pt

1.377

79

Au

1.647

80

Hg

1.353

81

Tl

2.174

82

Pb

2.148

83

Bi

2.185

84

Po

 

85

At

 

86

Rn

 

The van der Waals and intrinsic Coulomb radii for SM6 calculations are listed in Table 4. These values cannot be changed.

Table 4. Atomic radii (in angstroms) used for SM6 and SM8 aqueous solvation calculations. For elements where two values for the atomic radius is listed, the first value is the van der Waals radius that, along with the solvent radius, is used to compute the solvent accessible surface area (SASA), and the second value is the intrinsic Coulomb radius that is used to compute the polarization free energy. For all other elements, the van der Waals radius and intrinsic Coulomb radius are the same. Values for the actinides and lanthanides are 2.00

10

H

1.20
1.02

 

20

He

1.40

30

Li

1.82

40

Be

2.00

 

50

B

2.00

60

C

1.70
1.57

70

N

1.55
1.61

80

O

1.52

90

F

1.47

10

Ne

1.54

11

Na

2.27

12

Mg

1.73

 

13

Al

2.00

14

Si

2.10

15

P

1.80

16

S

1.80
2.12

17

Cl

1.75
2.02

18

Ar

1.88

19

K

2.75

20

Ca

2.00

21

Sc

2.00

22

Ti

2.00

23

V

2.00

24

Cr

2.00

25

Mn

2.00

26

Fe

2.00

27

Co

2.00

28

Ni

1.63

29

Cu

1.40

30

Zn

1.39

31

Ga

1.87

32

Ge

2.00

33

As

1.85

34

Se

1.90

35

Br

1.80
2.60

36

Kr

2.02

37

Rb

2.00

38

Sr

2.00

39

Y

2.00

40

Zr

2.00

41

Nb

2.00

42

Mo

2.00

43

Tc

2.00

44

Ru

2.00

45

Rh

2.00

46

Pd

1.63

47

Ag

1.72

48

Cd

1.58

49

In

2.93

50

Sn

2.17

51

Sb

2.00

52

Te

2.06

53

I

1.98

54

Xe

2.16

55

Cs

2.00

56

Ba

2.00

57

La

2.00

72

Hf

2.00

73

Ta

2.00

74

W

2.00

75

Re

2.00

76

Os

2.00

77

Ir

2.00

78

Pt

1.74

79

Au

1.66

80

Hg

1.55

81

Tl

1.96

82

Pb

2.02

83

Bi

2.00

84

Po

2.00

85

At

2.00

86

Rn

2.00

The covalent radii used to determine which atoms are bonded are given in Table 5. Two atoms are considered to be bonded if the distance between them is less than covfac times the sum of their covalent radii, where covfac is a gen section keyword with a default value of 1.2. The radii can be changed using the cov keyword. See Covalent Bonding Keyword in the Jaguar Input File for more information on how Jaguar uses and presents covalent radii and bonding information.

Table 5. Covalent Radii (in angstroms) used to evaluate levels of interaction (such as bonds) between atoms Generally, Jaguar considers two atoms bonded if the distance between them is less than covfac times the sum of their covalent radii, where covfac is keyword with a default value of 1.2. These radius settings can be altered by making cov settings in the atomic section of an input file, as described in The atomic Section of the Jaguar Input File.)

10

H

0.32

 

20

He

0.93

30

Li

1.23

40

Be

0.90

 

50

B

0.82

60

C

0.77

70

N

0.75

80

O

0.73

90

F

0.72

10

Ne

0.71

11

Na

1.54

12

Mg

1.36

 

13

Al

1.18

14

Si

1.11

15

P

1.06

16

S

1.02

17

Cl

0.99

18

Ar

0.98

19

K

2.03

20

Ca

1.74

21

Sc

1.44

22

Ti

1.32

23

V

1.22

24

Cr

1.18

25

Mn

1.17

26

Fe

1.17

27

Co

1.16

28

Ni

1.15

29

Cu

1.17

30

Zn

1.25

31

Ga

1.26

32

Ge

1.22

33

As

1.20

34

Se

1.16

35

Br

1.14

36

Kr

1.12

37

Rb

2.16

38

Sr

1.91

39

Y

1.62

40

Zr

1.45

41

Nb

1.34

42

Mo

1.30

43

Tc

1.27

44

Ru

1.25

45

Rh

1.25

46

Pd

1.28

47

Ag

1.34

48

Cd

1.48

49

In

1.44

50

Sn

1.41

51

Sb

1.40

52

Te

1.36

53

I

1.33

54

Xe

1.31

55

Cs

2.35

56

Ba

1.98

57

La

1.69

72

Hf

1.44

73

Ta

1.34

74

W

1.30

75

Re

1.28

76

Os

1.26

77

Ir

1.27

78

Pt

1.30

79

Au

1.34

80

Hg

1.49

81

Tl

1.48

82

Pb

1.47

83

Bi

1.46

84

Po

 

85

At

 

86

Rn

 

Single Point Energy Examples

Calculation of Molecular Properties Examples

Vibrational Frequency Examples