Convergent x-ray monochromator for molecular microprobe analysis
Abstract
An improved apparatus and method are provided for electron spectroscopy for chemical analysis which permits analysis of micron sized regions of a heterogeneous sample surface. The apparatus includes a source of multidirectional X-ray radiation. A hollow cylindrical body receives the multidirectional X-ray radiation. The hollow cylindrical body includes a plurality of beam directing Johannsen-type diffracting crystals elements arrayed symmetrically and circumferentially around an axis of symmetry extending from the source of X-ray radiation to a surface of the sample. The array of Johannsen-type diffracting crystals transforms the multidirectional X-ray radiation into a hollow cone of monochromatic X-ray radiation that converges on a micron sized region on the sample surface. A screen opaque to X-rays is located along the axis of symmetry between the source of X-ray radiation and the sample. The screen prevents X-rays from the source from reaching the sample without being directed and diffracted by the beam directing and diffracting elements. An electron detector located along the axis of symmetry detects electrons emitted from the micron sized region of the sample surface. The electron detector is located between the X-ray screen and the sample surface. 4 figs.
- Inventors:
- Publication Date:
- Research Org.:
- Bettis Atomic Power Lab., West Mifflin, PA (United States)
- Sponsoring Org.:
- USDOE; USDOE, Washington, DC (United States)
- OSTI Identifier:
- 6003309
- Patent Number(s):
- PATENTS-US-A7529403
- Application Number:
- ON: DE92004619; PPN: US 7-529403
- Assignee:
- Dept. of Energy
- DOE Contract Number:
- AC11-89PN38014
- Resource Type:
- Patent Application
- Resource Relation:
- Patent File Date: 29 May 1990
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALUMINIUM; K SHELL; MAGNESIUM; X RADIATION; MONOCHROMATORS; FOCUSING; INVENTIONS; MICROANALYSIS; PHOTOELECTRON SPECTROSCOPY; ALKALINE EARTH METALS; ELECTROMAGNETIC RADIATION; ELECTRON SPECTROSCOPY; ELECTRONIC STRUCTURE; ELEMENTS; IONIZING RADIATIONS; METALS; RADIATIONS; SPECTROSCOPY; 440800* - Miscellaneous Instrumentation- (1990-); 400102 - Chemical & Spectral Procedures
Citation Formats
Gamba, O O.M. Convergent x-ray monochromator for molecular microprobe analysis. United States: N. p., 1990.
Web.
Gamba, O O.M. Convergent x-ray monochromator for molecular microprobe analysis. United States.
Gamba, O O.M. Mon .
"Convergent x-ray monochromator for molecular microprobe analysis". United States.
@article{osti_6003309,
title = {Convergent x-ray monochromator for molecular microprobe analysis},
author = {Gamba, O O.M.},
abstractNote = {An improved apparatus and method are provided for electron spectroscopy for chemical analysis which permits analysis of micron sized regions of a heterogeneous sample surface. The apparatus includes a source of multidirectional X-ray radiation. A hollow cylindrical body receives the multidirectional X-ray radiation. The hollow cylindrical body includes a plurality of beam directing Johannsen-type diffracting crystals elements arrayed symmetrically and circumferentially around an axis of symmetry extending from the source of X-ray radiation to a surface of the sample. The array of Johannsen-type diffracting crystals transforms the multidirectional X-ray radiation into a hollow cone of monochromatic X-ray radiation that converges on a micron sized region on the sample surface. A screen opaque to X-rays is located along the axis of symmetry between the source of X-ray radiation and the sample. The screen prevents X-rays from the source from reaching the sample without being directed and diffracted by the beam directing and diffracting elements. An electron detector located along the axis of symmetry detects electrons emitted from the micron sized region of the sample surface. The electron detector is located between the X-ray screen and the sample surface. 4 figs.},
doi = {},
url = {https://www.osti.gov/biblio/6003309},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {1}
}