The Raman effect. Its significance for physics and chemistry: S. Bhagavantam. (Indian Journ. Physics, Vol. V, Part III.)
✍ Scribed by G.F.S.
- Book ID
- 104128561
- Publisher
- Elsevier Science
- Year
- 1932
- Tongue
- English
- Weight
- 240 KB
- Volume
- 213
- Category
- Article
- ISSN
- 0016-0032
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✦ Synopsis
CURRENT TOPICS. I I3
wave-length of 2.5 ~, while MgO transmits only IO to 2o per cent.
To get a transmission of 80 per cent with MgO the wave-length must be close to 5 ~. These differences agree with the fact that the zinc oxide particles are smaller than those of magnesium oxide.
With both oxides the percentage of transmission increases with the wave-length of the incident radiation. The total energy associated with each wave-length cannot be judged by the peccentage of transmission alone. It is the continued product of these four quantities, (a) energy leaving the source, (b) transmission of entire path in air, (c) reflection factor for grating, and (d) transmission factor for filter. The relative energies for the range of wave-lengths emitted by a Nernst lamp after they have fallen on films of four materials are given. For ZnO the maximum energy is at 2.I p, for MgO at 3.3 ~, for white lead spread on the mirror as a paste, 5 # and for silica similarly applied 7-4 ~-The average diameter of the four kinds of particles are respectively .22, • 35, -5 ° and 2. 5 ~. "Inspection shows that a very fair degree of separation between short and long waves has been effected and that, each filter may be used to advantage in the region of maximum energy." G. F. S.
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