By J.O. Hirschfelder, Douglas Henderson
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Chemical hazards are classified under five main headings. g. picric acid. g. under water, and that they are regularly inspected in order to maintain these conditions. The use of such substances should be carefully controlled and only small amounts used. Flammable Flammable liquids and solids are subdivided according to their flash points and many oxidizing substances can cause fire when in contact with combustible materials. Storage, handling and disposal are obviously major features to be considered when using such substances.
Some compounds do show radiative emission during triplet transitions and these compounds are said to phosphoresce. The most demonstrable difference between these two types of emission is the fact that fluorescence occurs within about I X 10-8 seconds and persists for only about I to I X 103 nanoseconds and is much faster than phosphorescence, which persists for up to I X 10-3 seconds due to the time taken for the spin change to occur. Chemiluminescence is another form of molecular emission in which the initial electronic transition is caused by an exergonic reaction rather than the absorption of radiant energy.
2 Emission of radiation An atom or molecule is said to be in an excited or unstable state when it absorbs energy which results in either electronic or vibrational transitions. It will return to its ground state very rapidly and the energy may be lost in one ofthree ways: 1. As a result of a chemical reaction. 2. By dissipation as heat. 3. By emission as radiation. If the atom or molecule loses all or part of this energy as radiation, photons of energy will be emitted which correspond to the difference between the energy levels involved.
Chemical Dynamics: Papers in Honor of H. Eyring by J.O. Hirschfelder, Douglas Henderson