{"id":118,"date":"2013-01-25T19:11:16","date_gmt":"2013-01-25T19:11:16","guid":{"rendered":"https:\/\/staffblogs.le.ac.uk\/mars\/2013\/01\/25\/friday-25th-january-2013-sol-168\/"},"modified":"2025-02-26T13:28:39","modified_gmt":"2025-02-26T13:28:39","slug":"friday-25th-january-2013-sol-168","status":"publish","type":"post","link":"https:\/\/staffblogs.le.ac.uk\/mars\/2013\/01\/25\/friday-25th-january-2013-sol-168\/","title":{"rendered":"Friday 25th January 2013 Sol 168"},"content":{"rendered":"<p>One of the features of the MAHLI microimager is that it has a set of LED lights around the lens aperture.&nbsp; The ultraviolet lights have now been tried out on one of the Yellowknife rocks Sayunei, which is a mixture of veining material and the surrounding sedimentary rock (see image).<\/p>\n<p>Illuminating a sample with utraviolet light, at about 365 nanometres wavelength has the potential to cause the emission of light of greater wavelength e.g. green or red light.&nbsp; Fluorescence is caused when electrons in the mineral&#8217;s structure are temporarily lifted into a higher energy level and then fall back into a lower energy level, emitting light in the process.&nbsp;<\/p>\n<p>Fluorescent minerals include calcium phosphate (apatite) and some sulphides which might be associated with alteration.&nbsp; X-rays can also cause fluorescence, but there is no way that we can detect them at the same time that APXS is analysing a surface.<\/p>\n<p>Perhaps at some point in the mission&nbsp;noting fluorescence&nbsp;will fit in a missing piece in the jigsaw.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>One of the features of the MAHLI microimager is that it has a set of LED lights around the lens aperture.&nbsp; The ultraviolet lights have now been tried out on one of the Yellowknife rocks Sayunei, which is a mixture of veining material and the surrounding sedimentary rock (see image). Illuminating a sample with utraviolet [&hellip;]<\/p>\n","protected":false},"author":273,"featured_media":362,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-118","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/staffblogs.le.ac.uk\/mars\/wp-json\/wp\/v2\/posts\/118","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/staffblogs.le.ac.uk\/mars\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/staffblogs.le.ac.uk\/mars\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/staffblogs.le.ac.uk\/mars\/wp-json\/wp\/v2\/users\/273"}],"replies":[{"embeddable":true,"href":"https:\/\/staffblogs.le.ac.uk\/mars\/wp-json\/wp\/v2\/comments?post=118"}],"version-history":[{"count":1,"href":"https:\/\/staffblogs.le.ac.uk\/mars\/wp-json\/wp\/v2\/posts\/118\/revisions"}],"predecessor-version":[{"id":704,"href":"https:\/\/staffblogs.le.ac.uk\/mars\/wp-json\/wp\/v2\/posts\/118\/revisions\/704"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/staffblogs.le.ac.uk\/mars\/wp-json\/wp\/v2\/media\/362"}],"wp:attachment":[{"href":"https:\/\/staffblogs.le.ac.uk\/mars\/wp-json\/wp\/v2\/media?parent=118"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/staffblogs.le.ac.uk\/mars\/wp-json\/wp\/v2\/categories?post=118"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/staffblogs.le.ac.uk\/mars\/wp-json\/wp\/v2\/tags?post=118"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}