Abstract

Absolute optical cross sections for the excitation from the X2g+ ground state of N2 by electron impact have been measured for 39 N2 first positive bands (B3ΠgA3u+), 12 N2+ first negative bands (B2uX2g+), and 10 N2+ Meinel bands (A2ΠuX2g+). Relative excitation functions are presented for N2 first negative bands with v′ values from 0 through 9 for 0 to 50 eV, for the (0,0) and (1,0) N2+ first negative bands for 0 to 450 eV, and for the (3,0) and (4,1) N2+ Meinel bands for 0 to 450 eV. The first-positive excitation functions exhibit sharp peaks at 10–12 eV and at 14–15 eV and exhibit an S-shaped change in slope about midway between onset and the maximum of the first sharp peak. The first negative and Meinel excitation functions have broad maxima at about 120 eV and 100 eV.

© 1969 Optical Society of America

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References

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  1. John D. Jobe and Robert M. St. John, J. Opt. Soc. Am. 57, 1449 (1967).
    [Crossref]
  2. A. E. de Vries and P. K. Pol, Vacuum 15, 135 (1965).
    [Crossref]
  3. J. C. DeVos, Physica 20, 690 (1954).
    [Crossref]
  4. John D. Jobe, Ph.D. dissertation (University of Oklahoma, Norman, Oklahoma, 1968), p. 15.
  5. R. W. B. Pearse and A. G. Gaydon, The Identification of Molecular Spectra (Chapman and Hall, London, 1963), 3rd ed., p. 210.
  6. R. N. Zare, E. O. Larsson, and R. A. Berg, J. Mol. Spectry. 15, 117 (1965).
    [Crossref]
  7. B. L. Moiseiwitsch and S. J. Smith, Rev. Mod. Phys. 40, 238 (1968). See pages 283–285. Our instrument polarization was very similar to that of Fig. 60.
    [Crossref]
  8. J. D. Jobe, F. A. Sharpton, and R. M. St. John, J. Opt. Soc. Am. 57, 106 (1967).
    [Crossref]
  9. R. W. Nicholls, J. Res. Natl. Bur. Std. (U. S.) A65, 451 (1961).
    [Crossref]
  10. V. V. Skubenich and I. P. Zapesochny, in International Conference on the Physics of Electronic and Atomic Collisions (Nauka Publishing House, Leningrad, 1967), Abstr. V, p. 570.
  11. J. W. McConkey, J. M. Woolsey, and D. J. Burns, Planet. Space Sci. 15, 1332 (1967).
    [Crossref]
  12. B. N. Srivastava and I. M. Mirza, Phys. Rev. 168, 86 (1968).
    [Crossref]
  13. D. T. Stewart, Proc. Roy. Soc. (London) A69, 437 (1956).
  14. W. F. Sheridan, O. Oldenberg, and N. P. Carleton, in International Conference on the Physics of Electronic and Atomic Collisions (W. A. Benjamin, Inc., New York, 1961), Abstr. II, p. 159.
  15. Hiroyuki Nishimura, J. Phys. Soc. Japan 24, 130 (1968).
    [Crossref]

1968 (3)

B. L. Moiseiwitsch and S. J. Smith, Rev. Mod. Phys. 40, 238 (1968). See pages 283–285. Our instrument polarization was very similar to that of Fig. 60.
[Crossref]

B. N. Srivastava and I. M. Mirza, Phys. Rev. 168, 86 (1968).
[Crossref]

Hiroyuki Nishimura, J. Phys. Soc. Japan 24, 130 (1968).
[Crossref]

1967 (3)

1965 (2)

A. E. de Vries and P. K. Pol, Vacuum 15, 135 (1965).
[Crossref]

R. N. Zare, E. O. Larsson, and R. A. Berg, J. Mol. Spectry. 15, 117 (1965).
[Crossref]

1961 (1)

R. W. Nicholls, J. Res. Natl. Bur. Std. (U. S.) A65, 451 (1961).
[Crossref]

1956 (1)

D. T. Stewart, Proc. Roy. Soc. (London) A69, 437 (1956).

1954 (1)

J. C. DeVos, Physica 20, 690 (1954).
[Crossref]

Berg, R. A.

R. N. Zare, E. O. Larsson, and R. A. Berg, J. Mol. Spectry. 15, 117 (1965).
[Crossref]

Burns, D. J.

J. W. McConkey, J. M. Woolsey, and D. J. Burns, Planet. Space Sci. 15, 1332 (1967).
[Crossref]

Carleton, N. P.

W. F. Sheridan, O. Oldenberg, and N. P. Carleton, in International Conference on the Physics of Electronic and Atomic Collisions (W. A. Benjamin, Inc., New York, 1961), Abstr. II, p. 159.

de Vries, A. E.

A. E. de Vries and P. K. Pol, Vacuum 15, 135 (1965).
[Crossref]

DeVos, J. C.

J. C. DeVos, Physica 20, 690 (1954).
[Crossref]

Gaydon, A. G.

R. W. B. Pearse and A. G. Gaydon, The Identification of Molecular Spectra (Chapman and Hall, London, 1963), 3rd ed., p. 210.

Jobe, J. D.

Jobe, John D.

John D. Jobe and Robert M. St. John, J. Opt. Soc. Am. 57, 1449 (1967).
[Crossref]

John D. Jobe, Ph.D. dissertation (University of Oklahoma, Norman, Oklahoma, 1968), p. 15.

Larsson, E. O.

R. N. Zare, E. O. Larsson, and R. A. Berg, J. Mol. Spectry. 15, 117 (1965).
[Crossref]

McConkey, J. W.

J. W. McConkey, J. M. Woolsey, and D. J. Burns, Planet. Space Sci. 15, 1332 (1967).
[Crossref]

Mirza, I. M.

B. N. Srivastava and I. M. Mirza, Phys. Rev. 168, 86 (1968).
[Crossref]

Moiseiwitsch, B. L.

B. L. Moiseiwitsch and S. J. Smith, Rev. Mod. Phys. 40, 238 (1968). See pages 283–285. Our instrument polarization was very similar to that of Fig. 60.
[Crossref]

Nicholls, R. W.

R. W. Nicholls, J. Res. Natl. Bur. Std. (U. S.) A65, 451 (1961).
[Crossref]

Nishimura, Hiroyuki

Hiroyuki Nishimura, J. Phys. Soc. Japan 24, 130 (1968).
[Crossref]

Oldenberg, O.

W. F. Sheridan, O. Oldenberg, and N. P. Carleton, in International Conference on the Physics of Electronic and Atomic Collisions (W. A. Benjamin, Inc., New York, 1961), Abstr. II, p. 159.

Pearse, R. W. B.

R. W. B. Pearse and A. G. Gaydon, The Identification of Molecular Spectra (Chapman and Hall, London, 1963), 3rd ed., p. 210.

Pol, P. K.

A. E. de Vries and P. K. Pol, Vacuum 15, 135 (1965).
[Crossref]

Sharpton, F. A.

Sheridan, W. F.

W. F. Sheridan, O. Oldenberg, and N. P. Carleton, in International Conference on the Physics of Electronic and Atomic Collisions (W. A. Benjamin, Inc., New York, 1961), Abstr. II, p. 159.

Skubenich, V. V.

V. V. Skubenich and I. P. Zapesochny, in International Conference on the Physics of Electronic and Atomic Collisions (Nauka Publishing House, Leningrad, 1967), Abstr. V, p. 570.

Smith, S. J.

B. L. Moiseiwitsch and S. J. Smith, Rev. Mod. Phys. 40, 238 (1968). See pages 283–285. Our instrument polarization was very similar to that of Fig. 60.
[Crossref]

Srivastava, B. N.

B. N. Srivastava and I. M. Mirza, Phys. Rev. 168, 86 (1968).
[Crossref]

St. John, R. M.

St. John, Robert M.

Stewart, D. T.

D. T. Stewart, Proc. Roy. Soc. (London) A69, 437 (1956).

Woolsey, J. M.

J. W. McConkey, J. M. Woolsey, and D. J. Burns, Planet. Space Sci. 15, 1332 (1967).
[Crossref]

Zapesochny, I. P.

V. V. Skubenich and I. P. Zapesochny, in International Conference on the Physics of Electronic and Atomic Collisions (Nauka Publishing House, Leningrad, 1967), Abstr. V, p. 570.

Zare, R. N.

R. N. Zare, E. O. Larsson, and R. A. Berg, J. Mol. Spectry. 15, 117 (1965).
[Crossref]

J. Mol. Spectry. (1)

R. N. Zare, E. O. Larsson, and R. A. Berg, J. Mol. Spectry. 15, 117 (1965).
[Crossref]

J. Opt. Soc. Am. (2)

J. Phys. Soc. Japan (1)

Hiroyuki Nishimura, J. Phys. Soc. Japan 24, 130 (1968).
[Crossref]

J. Res. Natl. Bur. Std. (U. S.) (1)

R. W. Nicholls, J. Res. Natl. Bur. Std. (U. S.) A65, 451 (1961).
[Crossref]

Phys. Rev. (1)

B. N. Srivastava and I. M. Mirza, Phys. Rev. 168, 86 (1968).
[Crossref]

Physica (1)

J. C. DeVos, Physica 20, 690 (1954).
[Crossref]

Planet. Space Sci. (1)

J. W. McConkey, J. M. Woolsey, and D. J. Burns, Planet. Space Sci. 15, 1332 (1967).
[Crossref]

Proc. Roy. Soc. (London) (1)

D. T. Stewart, Proc. Roy. Soc. (London) A69, 437 (1956).

Rev. Mod. Phys. (1)

B. L. Moiseiwitsch and S. J. Smith, Rev. Mod. Phys. 40, 238 (1968). See pages 283–285. Our instrument polarization was very similar to that of Fig. 60.
[Crossref]

Vacuum (1)

A. E. de Vries and P. K. Pol, Vacuum 15, 135 (1965).
[Crossref]

Other (4)

John D. Jobe, Ph.D. dissertation (University of Oklahoma, Norman, Oklahoma, 1968), p. 15.

R. W. B. Pearse and A. G. Gaydon, The Identification of Molecular Spectra (Chapman and Hall, London, 1963), 3rd ed., p. 210.

V. V. Skubenich and I. P. Zapesochny, in International Conference on the Physics of Electronic and Atomic Collisions (Nauka Publishing House, Leningrad, 1967), Abstr. V, p. 570.

W. F. Sheridan, O. Oldenberg, and N. P. Carleton, in International Conference on the Physics of Electronic and Atomic Collisions (W. A. Benjamin, Inc., New York, 1961), Abstr. II, p. 159.

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Figures (7)

Fig. 1
Fig. 1

Energy-level diagram of molecular nitrogen.

Fig. 2
Fig. 2

Scan of N2 spectrum from 5700 to 6200 Å produced by 12-eV electrons.

Fig. 3
Fig. 3

Relative optical excitation functions of N2 first-positive bands.

Fig. 4
Fig. 4

First-positive excitation functions near threshold. v′=4 and 11.

Fig. 5
Fig. 5

Apparent excitation cross sections of the B3Πg and C3Πu electronic states of N2.

Fig. 6
Fig. 6

Relative excitation functions of the (0,0) and (1,0) N2+ first negative bands.

Fig. 7
Fig. 7

Relative excitation functions of the (3,0) and (4,1) N2+ Meinel bands.

Tables (7)

Tables Icon

Table I Polarization of radiation observed at 90° to the electron beam for first positive bands of N2. p=5×10−3 torr.

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Table II Optical electron-excitation cross sections of first positive bands of N2 at the electron energy of the maximum of the first sharp peak in their excitation functions (10−18 cm2).

Tables Icon

Table III Apparent electron excitation cross sections of the vibrational states of the N2B3Πg electronic state.

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Table IV Optical cross sections of N2+ first negative bands at an electron energy of 120 eV (10−18 cm2).

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Table V Maximum apparent cross sections of the first 4 vibration states of the N2+ B2u+ electronic state.

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Table VI Optical cross sections of N2+ Meinel bands at 100 eV (10−18 cm2).

Tables Icon

Table VII Maximum apparent cross sections of the first six vibrational states of the N2+ A2Πu electronic state at 100 eV.

Equations (6)

Equations on this page are rendered with MathJax. Learn more.

Q ( v , v ) = e R ( v , v ) / I B N ( g ) ,
A v v rel = A v v / Σ v A v v
A v v / Σ v A v v q v v λ v v - 3 / Σ v q v v λ v v - 3
Q ( v ) = [ Q ( v , n ) + Q ( v , m ) + ] / [ A v n rel + A v m rel + ] ,
Q ( v , v ) = G P ( λ , T ) I ( v , v ) I B p I s ( λ v v ) ,
Q ( v , v ) = A R ( v , v ) Q ( v ) .