Lecture 6: Luminescence

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Source Metadata

Field	Value
Source	Radiation, Light and Illumination
Year	1909
Section ID	`radiation-light-and-illumination-lecture-06`
Location	lines 5077-6608
Status	candidate
Word Count	10895
Equation Candidates In Section	37
Figure Candidates In Section	13
Quote Candidates In Section	0

Opening Source Excerpt

LECTURE VI. LUMINESCENCE. 43. All methods of producing radiation, and more particularly light, other than the temperature radiation or incandescence, are generally comprised by the name luminescence. Some special cases of luminescence have already been discussed in the phe- nomena of fluorescence and phosphorescence, represented by the conversion of the radiation absorbed by a body into radiation of a different wave length. Usually luminescence at ordinary temperature, or at moderate temperatures, that is, temperatures below incandescence, is called fluorescence or phosphorescence. Fluorescence and Phosphorescence. Fluorescence is the production of radiation from the energy supplied to and absorbed by the fluorescent body, while phos- phorescence is the production of radiation from the energy stored in the phosphorescent body. This energy may be derived from internal changes in the body, as slow combustion, or may have been

Source-Located Theme Snippets

Radiation / light

LECTURE VI. LUMINESCENCE. 43. All methods of producing radiation, and more particularly light, other than the temperature radiation or incandescence, are generally comprised by the name luminescence. Some special cases of luminescence have already been discussed in the phe- nomena of fluorescence and phosphorescence, represented by the c ...

Dielectricity / capacity

... s origin, that is, the mechanism of light production by the firefly, etc., is still unknown. When splitting a sheet of mica, or shaking a well-exhausted tube containing mercury, flashes of light are seen in the darkness. This, however, is not real phosphorescence but due to electrostatic flashes of frictional electricity. The light given by fluorescence and phosphorescence of solids or liquids, gives a continuous spectrum, that is, is a mixture of all frequencies, just as is the case with temperature radiation; it differs, however, from temperature radiati ...

Waves / transmission lines

... descence, are generally comprised by the name luminescence. Some special cases of luminescence have already been discussed in the phe- nomena of fluorescence and phosphorescence, represented by the conversion of the radiation absorbed by a body into radiation of a different wave length. Usually luminescence at ordinary temperature, or at moderate temperatures, that is, temperatures below incandescence, is called fluorescence or phosphorescence. Fluorescence and Phosphorescence. Fluorescence is the production of radiation from the energy supplie ...

Alternating current

... rgy of phos- phorescent radiation is supplied by the energy of chemical change in the body — as with yellow phosphorus — obviously the phosphorescence persists as long as these chemical changes can occur. The different forms of luminescence may be distinguished by the character of the energy which is converted into radiation. The conversion of radiation energy into radiation of different wave length, either immediately, or after storage in the body, thus may be called radio-fluorescence and radio-phosphorescence. It was discussed in Lecture II. ...

Chapter-Local Concept Hits

Concept Candidate	Hits In Section	Status
Light	81	seeded
Radiation	59	seeded
Luminescence	47	seeded
Spectrum	32	seeded
Illumination	17	seeded
Frequency	8	seeded
Wave length	6	seeded
Brilliancy	4	seeded
Arc lamp	3	seeded
Ether	2	seeded
Ultra-violet radiation	1	seeded

Chapter-Local Glossary Hits

Term Candidate	Hits In Section	Status
ultra-violet	6	seeded
wave length	6	seeded
brilliancy	4	seeded
candle-power	3	seeded
ether	2	seeded
ultra-red	2	seeded

Equation Candidates

Candidate ID	OCR / PDF-Text Candidate	Source Location
`radiation-light-and-illumination-eq-candidate-0137`	in carbon bisulphide, CS2, which ignites spontaneously at about	line 5168
`radiation-light-and-illumination-eq-candidate-0138`	45. Industrially this is the most important form of lumines-	line 5293
`radiation-light-and-illumination-eq-candidate-0139`	spheres of a diameter 1.5 or more times their distance, with	line 5402
`radiation-light-and-illumination-eq-candidate-0140`	I have two needle-shaped terminals, 5 cm. distant from each other,	line 5437
`radiation-light-and-illumination-eq-candidate-0141`	If the Geissler tube has a considerable diameter, 3 to 5 cm.,	line 5450
`radiation-light-and-illumination-eq-candidate-0142`	less luminous spaces, about as shown in Fig. 32. The distance	line 5461
`radiation-light-and-illumination-eq-candidate-0143`	distances of 10 cm. and over very closely 4000 volts effective	line 5488
`radiation-light-and-illumination-eq-candidate-0144`	alternating per cm. (10,000 volts per inch) are required (a 2-cm.	line 5489

Figure Candidates

Candidate ID	OCR / PDF-Text Candidate	Source Location
`radiation-light-and-illumination-fig-031`	one, the other from the other terminal. They are stationary FIG. 31. only if the gas pressure is perfectly constant, but separate and contract with the slightest change of press…	line 5467
`radiation-light-and-illumination-fig-032`	II II FIG. 32. decreasing gas pressure the voltage consumed in the space be-	line 5499
`radiation-light-and-illumination-fig-033`	and you see the striated Geissler discharge through mercury FIG. 33. vapor appear between terminals 2 and 3, giving the green light> of the mercury spectrum. The terminals are q…	line 5680
`radiation-light-and-illumination-fig-034`	3J=10 OHMS FIG. 34. and the spectrum of the arc is the spectrum of the negative ter- minal. An exception herefrom, occurs only in those cases in	line 5719
`radiation-light-and-illumination-fig-035`	tendency exists of shifting the starting point, and the arc becomes FIG. 35. LUMINESCENCE.	line 5836
`radiation-light-and-illumination-fig-036`	lished by the vapor stream coming from the negative. Thus the FIG. 36. arc can be started by merely starting a conducting vapor stream from the negative, as by an auxiliary arc…	line 5860
`radiation-light-and-illumination-fig-037`	draw it out until the arc flame wraps itself all around terminal FIG. 37. B} but the arc does not transfer. I even insert 10 ohms resist- ance rl in series with C (Fig. 37), so…	line 5898
`radiation-light-and-illumination-fig-038`	ws FIG. 38. negative, that is, at a higher potential difference and a shorter distance against A than B is. I even hold C for some time in	line 5941

Hidden-Gem Quote Candidates

Candidate ID	Candidate Passage	Source Location
No chapter-local candidates yet	-	-

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Radiation / light: Compare the chapter’s radiation vocabulary with modern electromagnetic radiation, spectral frequency, wavelength, absorption, and illumination engineering.
Dielectricity / capacity: Check whether the passage treats capacity, condensers, displacement, or dielectric stress as field storage rather than only circuit algebra.
Waves / transmission lines: Map Steinmetz’s wave and line language onto modern distributed constants, propagation velocity, standing waves, and reflections.
Alternating current: Compare Steinmetz’s AC language with modern sinusoidal steady-state analysis, RMS quantities, phase, and phasor notation.
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Waves / transmission lines: Standing/traveling wave passages may support richer field interpretations; the page keeps those readings separate from verified Steinmetz wording.
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