Vibrational Excitation by Electron Impact near Threshold in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">H</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math>, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">D</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math>, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">N</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math>, and CO

P. D. Burrow; G. J. Schulz

doi:10.1103/PhysRev.187.97

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Vibrational Excitation by Electron Impact near Threshold in $H_{2}$ , $D_{2}$ , $N_{2}$ , and CO

P. D. Burrow and G. J. Schulz

Mason Laboratory, Yale University, New Haven, Connecticut 06520

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Phys. Rev. 187, 97 – Published 5 November, 1969

DOI: https://doi.org/10.1103/PhysRev.187.97

Abstract

The trapped-electron method is applied to the measurement of the slopes of the vibrational cross sections near their respective thresholds. Absolute values are obtained by normalization to positive-ion cross sections. The values obtained in $H_{2}$ are 43 for $v = 1, 0.72$ , for $v = 2, 0.04$ , for $v = 3, and 0.003$ , for $v = 4$ , in units of $10^{- 18}$ ${cm}^{2}$ /eV. The values for $N_{2}$ are 2.5 for $v = 1$ and about 0.02 for $v = 2$ , whereas, the values for CO are much larger, i.e., 120 for $v = 1 and 2.4$ for $v = 2$ . Various corrections that are necessary for determining absolute cross sections from trapped-electron data are discussed. The validity of the corrections is studied for the case of the $2 {}^{3}S$ excitation function in He.

References (24)

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M. G. Menendez and H. K. Holt, J. Chem. Phys. 45, 2743 (1966)
G. J. Schulz, Phys. Rev. 125, 229 (1962)
H. Ehrhardt and K. Willman, Z. Physik 204, 462 (1967)
H. Ehrhardt, L. Langhans, F. Linder, and H. S. Taylor, Phys. Rev. 173, 222 (1968)
G. J. Schulz and J. T. Dowell, Phys. Rev. 128, 174 (1962)
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R. D. Hake, Jr., and A. V. Phelps, Phys. Rev. 158, 70 (1967)
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J. N. Bardsley, A. Herzenberg, and F. Mandl [Proc. Phys. Soc. (London) 89, 321 (1966)]
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Omitted endnote
H. Maier-Leibnitz, Z. Physik 95, 499 (1936)
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[c1] G. J. Schulz, Phys. Rev. 135, A988 (1964)

[c2] M. G. Menendez and H. K. Holt, J. Chem. Phys. 45, 2743 (1966)

[c3] G. J. Schulz, Phys. Rev. 125, 229 (1962)

[c4] H. Ehrhardt and K. Willman, Z. Physik 204, 462 (1967)

[c5] H. Ehrhardt, L. Langhans, F. Linder, and H. S. Taylor, Phys. Rev. 173, 222 (1968)

[c6] G. J. Schulz and J. T. Dowell, Phys. Rev. 128, 174 (1962)

[c7] A. G. Engelhardt and A. V. Phelps, Phys. Rev. 131, 2115 (1963)

[c8] A. G. Engelhardt, A. V. Phelps, and C. G. Risk, Phys. Rev. 135, A1566 (1964)

[c9] R. D. Hake, Jr., and A. V. Phelps, Phys. Rev. 158, 70 (1967)

[c10] A. V. Phelps, Rev. Mod. Phys. 40, 399 (1968)

[c11] G. J. Schulz, Phys. Rev. 112, 150 (1958)

[c12] G. J. Schulz, Phys. Rev. 116, 1141 (1959)

[c13] R. E. Fox, W. M. Hickam, D. J. Grove, and T. Kjeldaas, Rev. Sci. Instr. 26, 1101 (1955)

[c14] G. Herzberg, Spectra of Diatomic Molecules (D. Van Nostrand Co., Inc., Princeton, New Jersey, 1950)

[c15] D. Rapp and P. Englander-Golden, J. Chem. Phys. 43, 1464 (1965)

[c16] J. N. Bardsley, A. Herzenberg, and F. Mandl [Proc. Phys. Soc. (London) 89, 321 (1966)]

[c17] M. J. W. Boness and G. J. Schulz (unpublished)

[c18] G. J. Schulz and R. K. Asundi, Phys. Rev. 158, 25 (1967)

[c19] E. L. Breig and C. C. Lin, J. Chem. Phys. 43, 3839 (1965) J. N. Bardsley, A. Herzenberg, and F. Mandl, Proc. Phys. Soc. (London) 89, 321 (1966)

[c20] J. C. Y. Chen, J. Chem. Phys. 40, 3507 (1964)

[c21] Omitted endnote

[c22] H. Maier-Leibnitz, Z. Physik 95, 499 (1936)

[c23] G. J. Schulz and R. E. Fox, Phys. Rev. 106, 1179 (1957)

[c24] F. M. J. Pichanick and J. Arol Simpson, Phys. Rev. 168, 64 (1968)

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Vibrational Excitation by Electron Impact near Threshold in $H_{2}$ , $D_{2}$ , $N_{2}$ , and CO

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Vibrational Excitation by Electron Impact near Threshold in H2, D2, N2, and CO

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Vibrational Excitation by Electron Impact near Threshold in $H_{2}$ , $D_{2}$ , $N_{2}$ , and CO