Abstract

Thermophosphorescence of glass colored violet by previous exposure to radium emanation. (1) Visible light emitted by the glass when heated to temperatures around 115° to 255° C was measured with a polarization photometer, using radium luminous paint as comparison source. The total quantity of light emitted by equal areas of similarly radiated glass of the same thickness was found by integration of the curves to be constant, independent of the temperature or rate of light emission. The rate of decrease of light intensity at constant temperature approximately fits the equation for second order chemical reaction dx/dt=k(ax)2. The values of the velocity constant k increase with temperature in accordance with the van’t Hoff equation log K=Ca/T. The temperature coefficient is somewhat lower than that characteristic of chemical reaction but higher than for most purely physical reactions. (2) Heat radiation. Measurements made with a Coblentz silver-bismuth thermopile failed to detect any increased heat radiation accompanying the luminescence.

© 1926 Optical Society of America

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References

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  1. Abstracted in the Physical Review,  23, p. 296; 1924.
  2. Meyer and Przibram, Sitz. Akad. Wiss. Wien,  121 (IIa), p. 1414; 1912.
  3. Lind, Jour. Phys. Chem.,  24, p. 437; 1920.
    [Crossref]
  4. Clarke, Phil. Mag.,  45, p. 268, p. 735; 1923.
    [Crossref]
  5. Coblentz, Bull. Bu. Stds.,  9, p. 7; 1913.
    [Crossref]
  6. Amberson, Journ. Gen. Physiol. 4, p. 517, p. 535; 1922.
    [Crossref]
  7. For a complete derivation, see Nernst’s, Theoretical Chemistry, fourth English Edition, p. 718; 1916.

1924 (1)

Abstracted in the Physical Review,  23, p. 296; 1924.

1923 (1)

Clarke, Phil. Mag.,  45, p. 268, p. 735; 1923.
[Crossref]

1922 (1)

Amberson, Journ. Gen. Physiol. 4, p. 517, p. 535; 1922.
[Crossref]

1920 (1)

Lind, Jour. Phys. Chem.,  24, p. 437; 1920.
[Crossref]

1913 (1)

Coblentz, Bull. Bu. Stds.,  9, p. 7; 1913.
[Crossref]

1912 (1)

Meyer and Przibram, Sitz. Akad. Wiss. Wien,  121 (IIa), p. 1414; 1912.

Amberson,

Amberson, Journ. Gen. Physiol. 4, p. 517, p. 535; 1922.
[Crossref]

Clarke,

Clarke, Phil. Mag.,  45, p. 268, p. 735; 1923.
[Crossref]

Coblentz,

Coblentz, Bull. Bu. Stds.,  9, p. 7; 1913.
[Crossref]

Lind,

Lind, Jour. Phys. Chem.,  24, p. 437; 1920.
[Crossref]

Meyer,

Meyer and Przibram, Sitz. Akad. Wiss. Wien,  121 (IIa), p. 1414; 1912.

Nernst’s,

For a complete derivation, see Nernst’s, Theoretical Chemistry, fourth English Edition, p. 718; 1916.

Przibram,

Meyer and Przibram, Sitz. Akad. Wiss. Wien,  121 (IIa), p. 1414; 1912.

Bull. Bu. Stds. (1)

Coblentz, Bull. Bu. Stds.,  9, p. 7; 1913.
[Crossref]

Jour. Phys. Chem. (1)

Lind, Jour. Phys. Chem.,  24, p. 437; 1920.
[Crossref]

Journ. Gen. Physiol. (1)

Amberson, Journ. Gen. Physiol. 4, p. 517, p. 535; 1922.
[Crossref]

Phil. Mag. (1)

Clarke, Phil. Mag.,  45, p. 268, p. 735; 1923.
[Crossref]

Physical Review (1)

Abstracted in the Physical Review,  23, p. 296; 1924.

Sitz. Akad. Wiss. Wien (1)

Meyer and Przibram, Sitz. Akad. Wiss. Wien,  121 (IIa), p. 1414; 1912.

Other (1)

For a complete derivation, see Nernst’s, Theoretical Chemistry, fourth English Edition, p. 718; 1916.

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Figures (7)

F. 1
F. 1

Diagram of apparatus showing arrangement of polarization photometer and furnace.

F. 2
F. 2

Variation of the intensity of transmitted light as dependent upon the angle between the principal planes of two nicol prisms.

F. 3
F. 3

Total quantities of light emitted by two exactly similar specimens of glass.

F. 4
F. 4

Showing rate of decay of the intensity of thermophosphorescence of two different specimens of glass at 130°C.

F. 5
F. 5

Rate of light emission as dependent upon the square of the light to be emitted.

F. 6
F. 6

Relation between the intensity of illumination and time.

F. 7
F. 7

Variation of velocity constant with temperature.

Tables (1)

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Table 1

Equations (1)

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k = 1 t 2 t 1 [ x 2 x 1 ( a x 2 ) ( a x 1 ) ]