Abstract

The first ionization potential of O<sub>2</sub> has been found to correspond to 1027.8±0.1 Å (12.063±0.001 eV). Previous determinations of the ionization potential are reviewed and compared with the present result. The photoionization cross section measured from threshold to 993 Å reveals vibrational structure superimposed on autoionized absorption peaks. The absorption spectrum illustrates the profuse absorption bands in the vicinity of the ionization threshold. Ionization was observed at wavelengths longer than 1027.8 Å and is explained on the basis of the formation of excited O<sub>2</sub>. From the interpretation of the results, the dissociation energy for the ground state of the ion is 6.669±0.001 eV and the electron affinity of O<sub>2</sub> is ≥0.21 eV.

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  1. W. C. Price and G. Collins, Phys. Rev. 48, 714 (1935).
  2. C. Moore, Atomic Energy Levels (U. S. Government Printing Office, Washington, D. C., 1949), Vol. 1, NBS Circular 467.
  3. P. Brix and G. Herzberg, Can. J. Phys. 32, 110 (1954).
  4. R. S. Mulliken and D. S. Stevens, Phys. Rev. 44, 720 (1933). All energies cited from references have been corrected to conform with the energy conversion factor 1 eV= 8065.73 cm-l.
  5. Q. Q. Douglas, Can. J. Phys. 30, 302 (1952).
  6. G. Herzberg (private communication, 1965).
  7. R. S. Mulliken (private communication, 1965).
  8. D. S. Stevens, Phys. Rev. 38, 1292 (1931).
  9. J. T. Tate and P. T. Smith, Phys. Rev. 39, 270 (1932).
  10. H. D. Hagstrum, Rev. Mod. Phys. 23, 185 (1951).
  11. C. E. Brion, J. Chem. Phys. 40, 2995 (1964).
  12. J. W. McGowan, E. M. Clarke, H. P. Hanson, and R. F. Stebbings, Phys. Rev. Letters 13, 620 (1964).
  13. E. C. Y. Inn, Phys. Rev. 91, 1194 (1953).
  14. K. Watanabe and F. F. Marmo, J. Chem. Phys. 25, 965 (1956).
  15. A. J. C. Nicholson, J. Chem. Phys. 39, 954 (1963).
  16. J. A. R. Samson, J. Opt. Soc. Am. 54, 6 (1964).
  17. W. R. S. Garton, Rev. Sci. Instr. 36, 11 (1959).
  18. R. K. Curran, J. Chem. Phys. 38, 2974 (1963).
  19. J. L. Pack and A. V. Phelps, J. Chem. Phys. 44, 1870 (1966).
  20. D. S. Burch, S. J. Smith, and L. M. Branscomb, Phys. Rev. 112, 171 (1958).
  21. R. S. Mulliken, Phys. Rev. 115, 1225 (1959).
  22. H. D. Pritchard, Chem. Rev. 52, 529 (1953).
  23. M. E. Wacks, J. Chem. Phys. 41, 930 (1964).
  24. G. Herzberg, Spectra of Diatomic Molecules (D. Van Nostrand Co., Inc., New York, 1950), 2nd ed., p. 560.
  25. G. R. Cook and R. J. McNeal, Meeting Opt. Soc. Am. (March 1966).
  26. R. B. Cairns and J. A. R. Samson, Phys. Rev. 139, A1403 (1965).
  27. S. N. Foner and R. L. Hudson, J. Chem. Phys. 25, 601 (1956).

Branscomb, L. M.

D. S. Burch, S. J. Smith, and L. M. Branscomb, Phys. Rev. 112, 171 (1958).

Brion, C. E.

C. E. Brion, J. Chem. Phys. 40, 2995 (1964).

Brix, P.

P. Brix and G. Herzberg, Can. J. Phys. 32, 110 (1954).

Burch, D. S.

D. S. Burch, S. J. Smith, and L. M. Branscomb, Phys. Rev. 112, 171 (1958).

Cairns, R. B.

R. B. Cairns and J. A. R. Samson, Phys. Rev. 139, A1403 (1965).

Clarke, E. M.

J. W. McGowan, E. M. Clarke, H. P. Hanson, and R. F. Stebbings, Phys. Rev. Letters 13, 620 (1964).

Collins, G.

W. C. Price and G. Collins, Phys. Rev. 48, 714 (1935).

Cook, G. R.

G. R. Cook and R. J. McNeal, Meeting Opt. Soc. Am. (March 1966).

Curran, R. K.

R. K. Curran, J. Chem. Phys. 38, 2974 (1963).

Douglas, Q. Q.

Q. Q. Douglas, Can. J. Phys. 30, 302 (1952).

Foner, S. N.

S. N. Foner and R. L. Hudson, J. Chem. Phys. 25, 601 (1956).

Garton, W. R. S.

W. R. S. Garton, Rev. Sci. Instr. 36, 11 (1959).

Hagstrum, H. D.

H. D. Hagstrum, Rev. Mod. Phys. 23, 185 (1951).

Hanson, H. P.

J. W. McGowan, E. M. Clarke, H. P. Hanson, and R. F. Stebbings, Phys. Rev. Letters 13, 620 (1964).

Herzberg, G.

G. Herzberg (private communication, 1965).

P. Brix and G. Herzberg, Can. J. Phys. 32, 110 (1954).

G. Herzberg, Spectra of Diatomic Molecules (D. Van Nostrand Co., Inc., New York, 1950), 2nd ed., p. 560.

Hudson, R. L.

S. N. Foner and R. L. Hudson, J. Chem. Phys. 25, 601 (1956).

Inn, E. C. Y.

E. C. Y. Inn, Phys. Rev. 91, 1194 (1953).

Marmo, F. F.

K. Watanabe and F. F. Marmo, J. Chem. Phys. 25, 965 (1956).

McGowan, J. W.

J. W. McGowan, E. M. Clarke, H. P. Hanson, and R. F. Stebbings, Phys. Rev. Letters 13, 620 (1964).

McNeal, R. J.

G. R. Cook and R. J. McNeal, Meeting Opt. Soc. Am. (March 1966).

Moore, C.

C. Moore, Atomic Energy Levels (U. S. Government Printing Office, Washington, D. C., 1949), Vol. 1, NBS Circular 467.

Mulliken, R. S.

R. S. Mulliken and D. S. Stevens, Phys. Rev. 44, 720 (1933). All energies cited from references have been corrected to conform with the energy conversion factor 1 eV= 8065.73 cm-l.

R. S. Mulliken (private communication, 1965).

R. S. Mulliken, Phys. Rev. 115, 1225 (1959).

Nicholson, A. J. C.

A. J. C. Nicholson, J. Chem. Phys. 39, 954 (1963).

Pack, J. L.

J. L. Pack and A. V. Phelps, J. Chem. Phys. 44, 1870 (1966).

Phelps, A. V.

J. L. Pack and A. V. Phelps, J. Chem. Phys. 44, 1870 (1966).

Price, W. C.

W. C. Price and G. Collins, Phys. Rev. 48, 714 (1935).

Pritchard, H. D.

H. D. Pritchard, Chem. Rev. 52, 529 (1953).

Samson, J. A. R.

J. A. R. Samson, J. Opt. Soc. Am. 54, 6 (1964).

R. B. Cairns and J. A. R. Samson, Phys. Rev. 139, A1403 (1965).

Smith, P. T.

J. T. Tate and P. T. Smith, Phys. Rev. 39, 270 (1932).

Smith, S. J.

D. S. Burch, S. J. Smith, and L. M. Branscomb, Phys. Rev. 112, 171 (1958).

Stebbings, R. F.

J. W. McGowan, E. M. Clarke, H. P. Hanson, and R. F. Stebbings, Phys. Rev. Letters 13, 620 (1964).

Stevens, D. S.

D. S. Stevens, Phys. Rev. 38, 1292 (1931).

R. S. Mulliken and D. S. Stevens, Phys. Rev. 44, 720 (1933). All energies cited from references have been corrected to conform with the energy conversion factor 1 eV= 8065.73 cm-l.

Tate, J. T.

J. T. Tate and P. T. Smith, Phys. Rev. 39, 270 (1932).

Wacks, M. E.

M. E. Wacks, J. Chem. Phys. 41, 930 (1964).

Watanabe, K.

K. Watanabe and F. F. Marmo, J. Chem. Phys. 25, 965 (1956).

Other (27)

W. C. Price and G. Collins, Phys. Rev. 48, 714 (1935).

C. Moore, Atomic Energy Levels (U. S. Government Printing Office, Washington, D. C., 1949), Vol. 1, NBS Circular 467.

P. Brix and G. Herzberg, Can. J. Phys. 32, 110 (1954).

R. S. Mulliken and D. S. Stevens, Phys. Rev. 44, 720 (1933). All energies cited from references have been corrected to conform with the energy conversion factor 1 eV= 8065.73 cm-l.

Q. Q. Douglas, Can. J. Phys. 30, 302 (1952).

G. Herzberg (private communication, 1965).

R. S. Mulliken (private communication, 1965).

D. S. Stevens, Phys. Rev. 38, 1292 (1931).

J. T. Tate and P. T. Smith, Phys. Rev. 39, 270 (1932).

H. D. Hagstrum, Rev. Mod. Phys. 23, 185 (1951).

C. E. Brion, J. Chem. Phys. 40, 2995 (1964).

J. W. McGowan, E. M. Clarke, H. P. Hanson, and R. F. Stebbings, Phys. Rev. Letters 13, 620 (1964).

E. C. Y. Inn, Phys. Rev. 91, 1194 (1953).

K. Watanabe and F. F. Marmo, J. Chem. Phys. 25, 965 (1956).

A. J. C. Nicholson, J. Chem. Phys. 39, 954 (1963).

J. A. R. Samson, J. Opt. Soc. Am. 54, 6 (1964).

W. R. S. Garton, Rev. Sci. Instr. 36, 11 (1959).

R. K. Curran, J. Chem. Phys. 38, 2974 (1963).

J. L. Pack and A. V. Phelps, J. Chem. Phys. 44, 1870 (1966).

D. S. Burch, S. J. Smith, and L. M. Branscomb, Phys. Rev. 112, 171 (1958).

R. S. Mulliken, Phys. Rev. 115, 1225 (1959).

H. D. Pritchard, Chem. Rev. 52, 529 (1953).

M. E. Wacks, J. Chem. Phys. 41, 930 (1964).

G. Herzberg, Spectra of Diatomic Molecules (D. Van Nostrand Co., Inc., New York, 1950), 2nd ed., p. 560.

G. R. Cook and R. J. McNeal, Meeting Opt. Soc. Am. (March 1966).

R. B. Cairns and J. A. R. Samson, Phys. Rev. 139, A1403 (1965).

S. N. Foner and R. L. Hudson, J. Chem. Phys. 25, 601 (1956).

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