Abstract

Filaments of semicircular cross section (diam 0.25–0.32 mm) were mounted in bulbs with plane windows. Chopped plane-polarized radiant flux was reflected from the flat surface, then passed through an analyzer whose plane of polarization made a 45° angle with the plane of reflection at the filament. The orientation of the polarizer was varied in 45° steps, and wavelengths from 0.47 to 2.0 µ were used. The metals studied were W, Mo, Ta, Ir, Re, Nb, and Pt. Filament temperatures ranged from 300 to 2400–25000°K. (Maximum for Pt was 1900°.) <i>n-vs</i>-λ curves for different temperatures were close together in the visible, but spread apart with increasing wavelength in the infrared. Curves showing <i>k</i><i>vs</i> λ and <i>e vs</i> λ usually crossed one another near a common point. Deviations from previously published data ranged up to 15 or 20%. Systematic errors in some of the infrared data, due to difficulty in centering the reflecting surface in the beam from the source lamp, are quiet obvious. Rough agreement with a simplified form of the Drude theory is approached with increasing wavelength in certain cases.

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  1. D. G. Avery, Proc. Phys. Soc. (London) 65B, 425 (1952).
  2. Nn-ik.
  3. J. N. Hodgson, Proc. Phys. Soc. (London) 68B 593 (1955).
  4. J. R. Beattie and G. K. T. Conn, Phil. Mag. 46, 222 (1955); J. R. Beattie, Phil. Mag. 46, 235 (1955).
  5. For references to Drude's articles and a discussion of the advantages of the theory based on two types of free-charge carriers, see S. Roberts, Phys. Rev. 100, 1667 (1955).

Avery, D. G.

D. G. Avery, Proc. Phys. Soc. (London) 65B, 425 (1952).

Beattie, J. R.

J. R. Beattie and G. K. T. Conn, Phil. Mag. 46, 222 (1955); J. R. Beattie, Phil. Mag. 46, 235 (1955).

Conn, G. K. T.

J. R. Beattie and G. K. T. Conn, Phil. Mag. 46, 222 (1955); J. R. Beattie, Phil. Mag. 46, 235 (1955).

Hodgson, J. N.

J. N. Hodgson, Proc. Phys. Soc. (London) 68B 593 (1955).

Roberts, S.

For references to Drude's articles and a discussion of the advantages of the theory based on two types of free-charge carriers, see S. Roberts, Phys. Rev. 100, 1667 (1955).

Other (5)

D. G. Avery, Proc. Phys. Soc. (London) 65B, 425 (1952).

Nn-ik.

J. N. Hodgson, Proc. Phys. Soc. (London) 68B 593 (1955).

J. R. Beattie and G. K. T. Conn, Phil. Mag. 46, 222 (1955); J. R. Beattie, Phil. Mag. 46, 235 (1955).

For references to Drude's articles and a discussion of the advantages of the theory based on two types of free-charge carriers, see S. Roberts, Phys. Rev. 100, 1667 (1955).

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