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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=10207&size=small" /></div> <h1 class="ph">德国在实验室制造出黑洞等离子体 </h1> <p class="xg1"> 时间：2010-11-8 10:15<a class="zz" href="home.php?mod=space&uid=10207">作者：乏味</a> 阅读<em id="_viewnum">(951)</em> 评论: 0</p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>据美国物理学家组织网11月4日报道，德国马克斯普朗克核物理研究所和赫尔姆霍茨柏林中心的研究人员使用柏林同步加速器（BESSY Ⅱ）在实验室成功产生了黑洞周边的等离子体。</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><P>据美国<a href="http://theory.oecr.com" target="_blank" class="relatedlink">物理</a>学家组织网11月4日报道，德国马克斯普朗克核物理研究所和赫尔姆霍茨柏林中心的研究人员使用柏林同步加速器（BESSY Ⅱ）在实验室成功产生了黑洞周边的等离子体。通过该研究，之前只能在太空由人造卫星执行的天文物理实验，也可以在地面进行，诸多天文物理学难题有望得到解决。<BR> <BR>黑洞的重力很大，会吸附一切物质。进入黑洞后，任何东西都不可能从黑洞的边界之内逃逸出来。随着被吸入的物体的温度不断升高，会产生核与<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>分离的高温等离子体。<BR> <BR>黑洞吸附物质会产生X射线，X射线反过来又会刺激其中的大量化学元素发射出具有独特线条（颜色）的X射线。分析这些线条可以帮助科学家了解更多有关黑洞附近等离子体的密度、速度和组成成分等信息。</P> <P><A href="http://www.oecr.com/data/attachment/portal/201011/08/1014230k69tdr6t6vkkm60.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201011/08/1014230k69tdr6t6vkkm60.jpg"></A></P> <P>在这个过程中，铁起了非常关键的作用。尽管铁在宇宙中的储量并不如更轻的氢和氦丰富，但是，它能够更好地吸收和重新发射出X射线，发射出的光子因此也比其他更轻的原子发射出的光子具有更高的能量、更短的波长（使得其具有不同的颜色）。<BR> <BR>铁发射出的X射线在穿过黑洞周围的介质时也会被吸收。在这个所谓的光离化过程中，铁原子通常会经历几次电离，其包含的26个电子中有超过一半会被去除，最终产生带电离子，带电离子聚集成为等离子体。而现在，研究人员在实验室中重现了这个过程。<BR> <BR>实验的核心是马克斯普朗克核物理研究所设计的电子束离子阱。在这个离子阱中，铁原子经由一束强烈的电子束加热，从而被离子化14次。实验过程如下：一团铁离子（仅仅几厘米长并且像头发丝一样薄）在磁场和电场的作用下被悬停在一个超高真空内，同步加速器发射出的X射线的光子能量被一台精确性超高的“单色仪”挑选出来，作为一束很薄但却集中的光束施加到铁离子上。<BR> <BR>实验室<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测量</a>到的光谱线与钱德拉X射线天文台和牛顿X射线多镜望远镜所观测的结果相匹配。也就是说，研究人员在地面实验室人为制造出了太空中的黑洞等离子体。<BR> <BR>这种新奇的方法将带电离子的离子阱和同步加速器辐射源结合在一起，让人们可以更好地了解黑洞周围的等离子体或者活跃的星系核。研究人员希望，将EBIT分光检查镜和更清晰的第三代（2009年开始在德国汉堡运行的同步辐射源PETRAⅢ）、第四代（X射线自由电子<a href="http://laser.oecr.com" target="_blank" class="relatedlink">激光</a>XFEL）X射线源结合，将能够给该研究领域带来更多新鲜活力。</P></td></tr></table> <!--[diy=diycontentbottom]--><div id="diycontentbottom" class="area"></div><!--[/diy]--> <script src="data/cache/home.js?eOg" type="text/javascript"></script> <div 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