Relative dominance of bulk or surface absorption in highly transparent materials by transient methods

Autor:	Richard A. Forman, Herbert S. Bennett
Rok vydání:	1977
Předmět:	Surface (mathematics) Chemistry Time derivative Time rate Relative pressure Analytical chemistry General Physics and Astronomy Transient (oscillation) Absorption (electromagnetic radiation) Molecular physics Relative dominance Pulse (physics)
Zdroj:	Journal of Applied Physics. 48:1217-1222
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.323762
Popis:	For the case in which a pulsed laser beam passes through the weakly absorbing windows of a gas cell containing a nonabsorbing gas, the time rate of change of the relative pressure rise immediately after the cessation of the laser beam correlates directly with the relative dominance of bulk and surface absorption in highly transparent materials. Whenever bulk absorption dominates, the time derivative of the pressure rise in the gas for times shortly after cessation of the pulse is positive; when surface absorption dominates, it is negative; and when bulk and surface absorption are comparable, it is very close to zero. This, suggests then, a relatively simple experimental procedure by which one may determine nondestructively the relative dominance of bulk or surface absorption in highly transparent materials.
Databáze:	OpenAIRE
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