The Optical Properties of Crystals With a General Introduction to Their Physica
The Optical Properties of Crystals With a General Introduction to Their Physica
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In such cases, under the influence of an irradia- tion, the interior of the body in its turn emits light, but the emitted light is of a different color from that absorbed. This property is possessed in particular by the solutions of a series of organic substances; it appears likewise in fluor-spar (fluorite), after which the property is named, a mineral colored by certain organic substances distributed in dilute form; the same property is exhibited also by the so-called uranium glass. In the tw...o latter cases, as in the first, it is a matter of a solution of the fluorescing substance, but in a solid body. Uranium glass and the crystals of fluor-spar are singly refracting media, hence emit- ting light whose color is independent of the direction of the vibra- tions. Doubly refracting fluorescent crystals must obviously behave otherwise; and here two cases must be distinguished: i. When the crystal is strongly pleochroic, the color must of course vary with the direction; therefore in the case of the optically uniaxial crystals it must vary with the angle that the vibration direction of the incident light excited by the fluores- cence forms with the optic axis of the crystal.
What to read after The Optical Properties of Crystals With a General Introduction to Their Physica?
You can find similar books in the "Read Also" column, or choose other free books by P Paul Groth to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
In such cases, under the influence of an irradia- tion, the interior of the body in its turn emits light, but the emitted light is of a different color from that absorbed. This property is possessed in particular by the solutions of a series of organic substances; it appears likewise in fluor-spar (fluorite), after which the property is named, a mineral colored by certain organic substances distributed in dilute form; the same property is exhibited also by the so-called uranium glass. In the tw...o latter cases, as in the first, it is a matter of a solution of the fluorescing substance, but in a solid body. Uranium glass and the crystals of fluor-spar are singly refracting media, hence emit- ting light whose color is independent of the direction of the vibra- tions. Doubly refracting fluorescent crystals must obviously behave otherwise; and here two cases must be distinguished: i. When the crystal is strongly pleochroic, the color must of course vary with the direction; therefore in the case of the optically uniaxial crystals it must vary with the angle that the vibration direction of the incident light excited by the fluores- cence forms with the optic axis of the crystal.
What to read after The Optical Properties of Crystals With a General Introduction to Their Physica?
You can find similar books in the "Read Also" column, or choose other free books by P Paul Groth to read onlineMoreLess
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