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  1. Phys. Rev. 3, p. 243–254, 1924.
  2. Recently Paul D. Foote and the writer have performed the Cario-Franck experiment with mixtures of mercury with sodium, rubidium and caesium, using this type of source to obtain the 2536.7 mercury line with great intensity. The hydrogen streamed past a drop of mercury at room temperature before it entered the discharge.
  3. The theories of the behavior of resonance radiation in a magnetic field deduced from the quantum theory of the Zeeman effect by Breit, Joos, Hanle, and Pringsheim would lead us to expect zero polarization in this case, provided the sum of the intensities of the S components is equal to that of the P components in the Zeeman pattern. However all values of polarization observed in sodium may be computed quite closely if we assume that the intensities of the Zeeman components are in the ratios 10:4:3 in the D2 pattern. Measurements of the intensities of the components of the D2 Zeeman pattern do not indicate any such resultant polarization.
  4. Bohr, in a note appearing in Die Naturwissenschaften, Dec. 5, 1924, states that Franck has written him of a similar observation made by Hanle with 2536.7 resonance radiation of mercury.
  5. This 'semi-classical' mechanism is able to account for the observed phenomena qualitatively, and its use as a first approximation may be justified on this account. It does not lead to a relation of the form R= R0e-KH in accordance with observation but gives a curve having a horizontal tangent at the point H=0, cƒ. Eldridge, Phys. Rev. 3, pp. 237–42; 1924, and a paper by G. Breit in the present issue of this journal. Eldridge, in a letter to Professor Wood in April, 1924, predicted the rotation of the plane of polarization in resonance radiation. This rotation had been observed by the author previous to this time, as Eldridge notes in the paper cited above.
  6. Wood and Ellett, Phys. Rev. 3, pp. 243–254, 1924.
  7. W. Wien, Ann. d. Phys., 73, p. 483, 1924.

Bohr,

Bohr, in a note appearing in Die Naturwissenschaften, Dec. 5, 1924, states that Franck has written him of a similar observation made by Hanle with 2536.7 resonance radiation of mercury.

Wien, W.

W. Wien, Ann. d. Phys., 73, p. 483, 1924.

Other (7)

Phys. Rev. 3, p. 243–254, 1924.

Recently Paul D. Foote and the writer have performed the Cario-Franck experiment with mixtures of mercury with sodium, rubidium and caesium, using this type of source to obtain the 2536.7 mercury line with great intensity. The hydrogen streamed past a drop of mercury at room temperature before it entered the discharge.

The theories of the behavior of resonance radiation in a magnetic field deduced from the quantum theory of the Zeeman effect by Breit, Joos, Hanle, and Pringsheim would lead us to expect zero polarization in this case, provided the sum of the intensities of the S components is equal to that of the P components in the Zeeman pattern. However all values of polarization observed in sodium may be computed quite closely if we assume that the intensities of the Zeeman components are in the ratios 10:4:3 in the D2 pattern. Measurements of the intensities of the components of the D2 Zeeman pattern do not indicate any such resultant polarization.

Bohr, in a note appearing in Die Naturwissenschaften, Dec. 5, 1924, states that Franck has written him of a similar observation made by Hanle with 2536.7 resonance radiation of mercury.

This 'semi-classical' mechanism is able to account for the observed phenomena qualitatively, and its use as a first approximation may be justified on this account. It does not lead to a relation of the form R= R0e-KH in accordance with observation but gives a curve having a horizontal tangent at the point H=0, cƒ. Eldridge, Phys. Rev. 3, pp. 237–42; 1924, and a paper by G. Breit in the present issue of this journal. Eldridge, in a letter to Professor Wood in April, 1924, predicted the rotation of the plane of polarization in resonance radiation. This rotation had been observed by the author previous to this time, as Eldridge notes in the paper cited above.

Wood and Ellett, Phys. Rev. 3, pp. 243–254, 1924.

W. Wien, Ann. d. Phys., 73, p. 483, 1924.

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