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In biology, extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a species presumed extinct abruptly "reappears" (typically in the fossil record) after a period of apparent absence.
An extinction-type ellipsometer
ActiveCN120064142Bquick measurementimprove accuracyPolarisation-affecting propertiesAngle of incidenceWafer
The application discloses a kind of extinction formula ellipsometer, it is related to ellipsometric measurement technical field, including base, wafer stage, mounting bracket;Wafer stage is set on base, for adsorbing fixed sample to be measured, and can drive sample to be measured to carry out multidimensional movement;Mounting bracket is fixedly arranged on the base, and one side is uniformly provided with multiple inclined arrangement polarizing arm, and the other side is provided with multiple with the polarizing arm one-to-one corresponding polarizing arm;The polarizing arm and corresponding polarizing arm are used to measure the ellipsometric parameter of sample to be measured at different incident angles;Autocollimator is arranged on the mounting bracket, and it is located above wafer stage, for correcting the levelness of sample surface.The extinction formula ellipsometer provided in the application adopts multiple symmetrically arranged polarizing arm and polarizing arm, can trace the source of three important angles of polarizing angle, polarizing angle and incident angle, improves measurement precision and stability.
Owner:NATIONAL INSTITUTE OF METROLOGY CHINA