Accession Number : AD0267508

Title :   A GAS ABSORPTION CELL IN THE SOFT X RAY REGION

Corporate Author : CORNELL UNIV ITHACA N Y

Personal Author(s) : EDERER,DAVID

Report Date : OCT 1961

Pagination or Media Count : 1

Abstract : In measuring absorption cross sections of gases in the soft x ray region, the use of a gas cell has several advantages over the more conventional procedure in which the absorbing gas sample is allowed to fill the entire spectrograph. When a cell is used the absorbing path is only of the order of a few centimeters, and higher gas pressures of the order of 1-3 mm of Hg can be maintained within the cell. This feature makes it possible to control and measure the pressue accurately, confining the gas to a closed region so that the absorbing gas does not interfere with the operation of source or electronic detectors which require a high vacuum. In addition in the cell, the partial pressure due to any contaminating vapor is smaller by several orders of magnitude since pressures of the order of 1/1000 mm of Hg are required when the spectrograph is filled with gas. Moreover oil vapors or other products of outgassing are prevented from polluting the sample under study. (Author)

Descriptors :   *ABSORPTION, *GASES, *PHOTOTUBES, *X RAYS, ATTENUATION, EQUATIONS, EXPERIMENTAL DATA, FLUORESCENCE, FLUOROSCOPES, NUMERICAL INTEGRATION, NUCLEAR RADIATION SPECTROMETERS, PHOTOMULTIPLIER TUBES, TABLES(DATA), X RAY DIFFRACTION

Distribution Statement : APPROVED FOR PUBLIC RELEASE