Abstract

The band spectra of diatomic molecules P2, AS2, Sb2 and Bi2 were investigated in the spectral range 2100–10 000 Å with a medium-size spectrograph, using a discharge tube developed for studies of forbidden lines. A study of the excitation conditions of various bands shows, among other things, that the bands previously ascribed to As2+ actually are emitted from a low-lying electronic state of the As2 molecule. Several new band systems were found, for some of which a vibrational analysis was carried out. This permits the identification of three new electronic states for the P2 molecule and two new states for the As2 molecule. Four of these states are located below the previously known excited states of these molecules and belong to the triplet term system. A comparison with the N2 spectrum shows that for this group of diatomic molecules the 3Πg state, located above the 3u+ state for the N2 molecule, becomes gradually depressed below the 3u+ state as the atomic number of the element increases.

© 1967 Optical Society of America

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References

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  1. S. Mrozowski and C. Santaram, J. Opt. Soc. Am. 56, 1174 (1966).
    [Crossref]
  2. M. Hults and S. Mrozowski, J. Opt. Soc. Am. 54, 855 (1964).
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  3. G. Herzberg, Ann. Physik. 15, 677 (1932).
    [Crossref]
  4. G. Herzberg, Phys. Rev. 69, 362 (1946).
    [Crossref]
  5. G. Herzberg, L. Herzberg, and G. Milne, Can. J. Research A18, 139 (1940).
    [Crossref]
  6. M. Ashley, Phys. Rev. 44, 919 (1933).
    [Crossref]
  7. A. E. Douglas and K. Suryanarayama Rao, Can. J. Phys. 36, 565 (1958).
    [Crossref]
  8. K. Dressler, Helv. Phys. Acta 28, 563 (1955).
  9. N. A. Narasimham, Can. J. Phys. 35, 1242 (1957).
    [Crossref]
  10. G. M. Almy and G. D. Kinzer, Phys. Rev. 47, 721 (1935).
    [Crossref]
  11. G. D. Kinzer and G. M. Almy, Phys. Rev. 52, 814 (1937).
    [Crossref]
  12. G. Herzberg, Molecular Spectra and Molecular Structure (D. Van Nostrand Co.New York, 1950), 2nd ed.
  13. G. E. Gibson and A. MacFarlane, Phys. Rev. 46, 1059 (1934).
    [Crossref]
  14. G. Nakamura and L. Shidei, Japan J. Appl. Phys. 10, 11 (1935).
  15. S. M. Naudé, South African J. Sci. 32, 103 (1935).
  16. G. M. Almy, J. Phys. Chem. 41, 47 (1937).
    [Crossref]
  17. S. Mrozowski, Phys. Rev. 69, 169 (1946).
    [Crossref]

1966 (1)

1964 (1)

1958 (1)

A. E. Douglas and K. Suryanarayama Rao, Can. J. Phys. 36, 565 (1958).
[Crossref]

1957 (1)

N. A. Narasimham, Can. J. Phys. 35, 1242 (1957).
[Crossref]

1955 (1)

K. Dressler, Helv. Phys. Acta 28, 563 (1955).

1946 (2)

G. Herzberg, Phys. Rev. 69, 362 (1946).
[Crossref]

S. Mrozowski, Phys. Rev. 69, 169 (1946).
[Crossref]

1940 (1)

G. Herzberg, L. Herzberg, and G. Milne, Can. J. Research A18, 139 (1940).
[Crossref]

1937 (2)

G. M. Almy, J. Phys. Chem. 41, 47 (1937).
[Crossref]

G. D. Kinzer and G. M. Almy, Phys. Rev. 52, 814 (1937).
[Crossref]

1935 (3)

G. Nakamura and L. Shidei, Japan J. Appl. Phys. 10, 11 (1935).

S. M. Naudé, South African J. Sci. 32, 103 (1935).

G. M. Almy and G. D. Kinzer, Phys. Rev. 47, 721 (1935).
[Crossref]

1934 (1)

G. E. Gibson and A. MacFarlane, Phys. Rev. 46, 1059 (1934).
[Crossref]

1933 (1)

M. Ashley, Phys. Rev. 44, 919 (1933).
[Crossref]

1932 (1)

G. Herzberg, Ann. Physik. 15, 677 (1932).
[Crossref]

Almy, G. M.

G. D. Kinzer and G. M. Almy, Phys. Rev. 52, 814 (1937).
[Crossref]

G. M. Almy, J. Phys. Chem. 41, 47 (1937).
[Crossref]

G. M. Almy and G. D. Kinzer, Phys. Rev. 47, 721 (1935).
[Crossref]

Ashley, M.

M. Ashley, Phys. Rev. 44, 919 (1933).
[Crossref]

Douglas, A. E.

A. E. Douglas and K. Suryanarayama Rao, Can. J. Phys. 36, 565 (1958).
[Crossref]

Dressler, K.

K. Dressler, Helv. Phys. Acta 28, 563 (1955).

Gibson, G. E.

G. E. Gibson and A. MacFarlane, Phys. Rev. 46, 1059 (1934).
[Crossref]

Herzberg, G.

G. Herzberg, Phys. Rev. 69, 362 (1946).
[Crossref]

G. Herzberg, L. Herzberg, and G. Milne, Can. J. Research A18, 139 (1940).
[Crossref]

G. Herzberg, Ann. Physik. 15, 677 (1932).
[Crossref]

G. Herzberg, Molecular Spectra and Molecular Structure (D. Van Nostrand Co.New York, 1950), 2nd ed.

Herzberg, L.

G. Herzberg, L. Herzberg, and G. Milne, Can. J. Research A18, 139 (1940).
[Crossref]

Hults, M.

Kinzer, G. D.

G. D. Kinzer and G. M. Almy, Phys. Rev. 52, 814 (1937).
[Crossref]

G. M. Almy and G. D. Kinzer, Phys. Rev. 47, 721 (1935).
[Crossref]

MacFarlane, A.

G. E. Gibson and A. MacFarlane, Phys. Rev. 46, 1059 (1934).
[Crossref]

Milne, G.

G. Herzberg, L. Herzberg, and G. Milne, Can. J. Research A18, 139 (1940).
[Crossref]

Mrozowski, S.

Nakamura, G.

G. Nakamura and L. Shidei, Japan J. Appl. Phys. 10, 11 (1935).

Narasimham, N. A.

N. A. Narasimham, Can. J. Phys. 35, 1242 (1957).
[Crossref]

Naudé, S. M.

S. M. Naudé, South African J. Sci. 32, 103 (1935).

Santaram, C.

Shidei, L.

G. Nakamura and L. Shidei, Japan J. Appl. Phys. 10, 11 (1935).

Suryanarayama Rao, K.

A. E. Douglas and K. Suryanarayama Rao, Can. J. Phys. 36, 565 (1958).
[Crossref]

Ann. Physik. (1)

G. Herzberg, Ann. Physik. 15, 677 (1932).
[Crossref]

Can. J. Phys. (2)

A. E. Douglas and K. Suryanarayama Rao, Can. J. Phys. 36, 565 (1958).
[Crossref]

N. A. Narasimham, Can. J. Phys. 35, 1242 (1957).
[Crossref]

Can. J. Research (1)

G. Herzberg, L. Herzberg, and G. Milne, Can. J. Research A18, 139 (1940).
[Crossref]

Helv. Phys. Acta (1)

K. Dressler, Helv. Phys. Acta 28, 563 (1955).

J. Opt. Soc. Am. (2)

J. Phys. Chem. (1)

G. M. Almy, J. Phys. Chem. 41, 47 (1937).
[Crossref]

Japan J. Appl. Phys. (1)

G. Nakamura and L. Shidei, Japan J. Appl. Phys. 10, 11 (1935).

Phys. Rev. (6)

S. Mrozowski, Phys. Rev. 69, 169 (1946).
[Crossref]

G. M. Almy and G. D. Kinzer, Phys. Rev. 47, 721 (1935).
[Crossref]

G. D. Kinzer and G. M. Almy, Phys. Rev. 52, 814 (1937).
[Crossref]

G. Herzberg, Phys. Rev. 69, 362 (1946).
[Crossref]

M. Ashley, Phys. Rev. 44, 919 (1933).
[Crossref]

G. E. Gibson and A. MacFarlane, Phys. Rev. 46, 1059 (1934).
[Crossref]

South African J. Sci. (1)

S. M. Naudé, South African J. Sci. 32, 103 (1935).

Other (1)

G. Herzberg, Molecular Spectra and Molecular Structure (D. Van Nostrand Co.New York, 1950), 2nd ed.

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Figures (2)

Fig. 1
Fig. 1

Photograph of the new bands of the P2 molecule: (a and b) aX bands in the near ultraviolet, (c) unclassified bands in the visible, (d) near-infrared cb band system.

Fig. 2
Fig. 2

Photographs of bands of As2 and Sb2 molecules: (a) new ultraviolet system CX of As2, (b) Kinzer–Almy band system in the red (Cc) of As2, (c) new band system ac of As2 in the near infrared, (d) some new bands of Sb2 in the near infrared.

Tables (8)

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Table I Vibrational scheme for the a(3u+) → X1g+ bands of P2.

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Table II Vibrational scheme for the c(3Πu) → b(3Πg) bands of P2 (in the infrared).

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Table III Wavenumbers of the stronger unclassified bands of P2 in the visible.

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Table IV Vibrational scheme for the C(1u+) → X1g+ bands of As2.

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Table V Vibrational scheme for the C(1u+) → c(3Πg(01)) bands of As2.

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Table VI Wave numbers of the stronger unclassified and of the a(3u+) → c(3Πg) bands of AS2 in the infrared.

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Table VII Wavenumbers of the stronger unclassified bands of Sb2 in the infrared.

Tables Icon

Table VIII Electronic states and vibrational constants for P2 and AS2.

Equations (4)

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ν = 28506 + 605 ( ν + 1 2 ) - 2.5 ( ν + 1 2 ) 2 - 780.9 ( v + 1 2 ) + 2.82 ( v + 1 2 ) 2 .
ν = { 10180 10038 9915 } + 640 ( v + 1 2 ) - 4.0 ( v + 1 2 ) 2 - 562 ( v + 1 2 ) + 3.6 ( v + 1 2 ) 2 .
ν = 30817.6 + 336.7 ( ν + 1 2 ) - 1.3 ( v + 1 2 ) 2 - 430.3 ( v + 1 2 ) + 1.2 ( v + 1 2 ) 2 .
ν = { 16333.5 16171.2 } + 336.8 ( v + 1 2 ) - 1.4 ( v + 1 2 ) 2 - 314.0 ( v + 1 2 ) + 1.2 ( v + 1 2 ) 2 .