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5Â¥2012-04-09 14:05:27
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2Â¥2012-04-04 22:24:36
jaychenyl
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ÎÒ¿´µ½ÓÐÆªÎÄÏ×ÌáÁËһϣ¬¸úÄã˵µÄÒ»Ñù¡£ÎÒÒ²Ìù¹ýÀ´ÁË£¬²»¹ý×îºóÒ»¾äÎÒûÃ÷°×£¬This can be problematic when parts of the sample conduct.Ϊʲô²¿·Öµ¼µç¾Í»áÓÐÎÊÌ⣿ÁíÍ⣬ÓÃO-¾Í²»»áÓеçºÉÀÛ»ýÂ𣿠As SIMS uses high voltages to accelerate the primary ions, the sample must be conductive. It is therefore necessary to coat non-conducting samples, such as minerals, glasses and ceramics, with a conductive metal film. Typically, a thin (5 nm) gold (Au) coat is used as Au generally does not react with the sample. During sputtering, the Au coat is eroded away exposing the underlying sample surface, which becomes, once again, non-conductive. The ionisation efficiency, and hence the secondary ion yield from the sample, increases with increasing primary ion implantation. As the ion beam erodes the Au coat away, there is an optimum time when the signal is strongest ¨C shortly before the Au coat is entirely removed. After this stage, an electron flood gun may be used to dissipate charge build-up along the edges of the sputter crater, and allow secondary ions to leave the sample surface. This can be problematic when parts of the sample conduct. |
3Â¥2012-04-07 09:48:48
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