{"id":152,"date":"2017-08-08T20:47:44","date_gmt":"2017-08-08T20:47:44","guid":{"rendered":"https:\/\/home.physics.wisc.edu\/gilbert2\/?page_id=152"},"modified":"2026-03-09T02:30:05","modified_gmt":"2026-03-09T02:30:05","slug":"background","status":"publish","type":"page","link":"https:\/\/home.physics.wisc.edu\/gilbert\/background\/","title":{"rendered":"Background"},"content":{"rendered":"

Background<\/h1>

We have been investigating the electronic structure, crystallographic orientation and chemical composition of a wide variety of specimens by X<\/span>-ray P<\/span>hotoE<\/span>lectron E<\/span>mission spectroM<\/span>icroscopy (X-PEEM<\/span>), with synchrotron illumination. X-PEEM spectromicroscopy provides X<\/span>-ray A<\/span>bsorption N<\/span>ear E<\/span>dge S<\/span>tructure (XANES<\/span>) spectroscopy, that is, stacks of approximately 200 X-PEEM images are collected while scanning the photon energy. Each pixel in this stack of images provides a full XANES spectrum.<\/p>\r\n

Cells, tissues, minerals, proteins and biominerals are routinely imaged and analyzed with the S<\/span>pectromicroscope for PH<\/span>otoelectron I<\/span>maging of N<\/span>anostructures with X<\/span>-rays (SPHINX<\/span>) spectromicroscope. Analysis can be done with high spectral and spatial resolution with X-PEEM and XANES spectromicroscopy using our SPHINX instrument. This instrument has a best resolution of 10 nm. Its uses are broad, from archaeology to geology; from chemistry to biology. The only requirements are that the samples of interest be compatible with ultra-high vacuum, smooth, and flat.<\/p>\r\n

We recently started using PEEM-3 at the ALS, which uses an elliptically polarizing undulator (EPU) as its source, and is thus well-suited for polarization-dependent imaging contrast and crystal orientation analysis in biominerals.<\/p><\/div><\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"

We have been investigating the electronic structure, crystallographic orientation and chemical composition of a wide variety of specimens by X-ray PhotoElectron Emission spectroMicroscopy (X-PEEM), with synchrotron illumination. X-PEEM spectromicroscopy provides X-ray Absorption Near Edge Structure (XANES) spectroscopy, that is, stacks of approximately 200 X-PEEM images are collected while scanning the photon energy. Each pixel in…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_uw_migration_status":"in-progress","_uw_gutenberg_post_content_before_migration":"","footnotes":""},"class_list":["post-152","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/home.physics.wisc.edu\/gilbert\/wp-json\/wp\/v2\/pages\/152","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/home.physics.wisc.edu\/gilbert\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/home.physics.wisc.edu\/gilbert\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/home.physics.wisc.edu\/gilbert\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/home.physics.wisc.edu\/gilbert\/wp-json\/wp\/v2\/comments?post=152"}],"version-history":[{"count":5,"href":"https:\/\/home.physics.wisc.edu\/gilbert\/wp-json\/wp\/v2\/pages\/152\/revisions"}],"predecessor-version":[{"id":1198,"href":"https:\/\/home.physics.wisc.edu\/gilbert\/wp-json\/wp\/v2\/pages\/152\/revisions\/1198"}],"wp:attachment":[{"href":"https:\/\/home.physics.wisc.edu\/gilbert\/wp-json\/wp\/v2\/media?parent=152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}