• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of mass spectrometry: JMS >Kinetic-energy-sensitive mass spectrometry for separation of different ions with the same m/z value
【24h】

Kinetic-energy-sensitive mass spectrometry for separation of different ions with the same m/z value

机译：动能敏感质谱法，用于将不同离子与相同M / Z值的分离

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A double-focusing mass spectrometer (MS) equipped with a superconducting-tunnel-junction (STJ) detector has been applied to measure relative ionization cross-sections for the production of ions that are accompanied by different ion species with the same mass-to-charge (m/z) value. The STJ detector fabricated for this study enables kinetic energy (E) measurement of incoming individual ions at a counting rate of up to similar to 100 k ions/s and an energy resolution (Delta E/E) of 15%. Both high counting rate and high-energy resolution are necessary to independently determine both m and z and not the m/z value only in ion-counting MS experiments. Ions such as N-14(2)2+ and N-14(+) with the same m/z value can be clearly discriminated using a kinetic-energy-sensitive MS. This fine discrimination capability allows direct determination of relative ionization cross-sections of the homonuclear diatomic ions (N22+/14N22+)-N-14 and (O22+/16O2+)-O-16, which are difficult to measure due to the strong interference by the signals of their dissociated atomic ions with noticeably large ionization cross-sections. The new instrument requires no low-abundance heteronuclear diatomic molecules of the forms (NN)-N-14-N-15 or (OO)-O-16-O-17 to carry out ionization studies and thus, is expected to be useful in fields such as atmospheric science, interstellar science, or plasma physics.
机译：已经施加了配备有超导隧道结（STJ）检测器的双聚焦质谱仪（MS）以测量用于生产离子的相对电离横截面，其伴随着具有相同质量的不同离子物质。充电（m / z）值。为该研究制造的STJ检测器使动能（E）能够以相似的计数率的输入单个离子的测量，其与100k离子/ s和15％的能量分辨率（Delta E / E）。高计数率和高能分辨率都是必需的，以独立地确定M和Z而不是仅在离子计数MS实验中的M / Z值。可以使用动能 - 能量敏感的MS清楚地区分，例如具有相同M / Z值的N-14（2）2+和N-14（+）的离子。这种精细的辨别能力允许直接测定同核硅离子（N22 + / 14N22 +） - N-14和（O 2 2 + / 1602 +）-O-16的相对电离横截面，这难以衡量的是由于受强烈的干扰而难以测量与明显大的电离横截面明显大的原子离子的信号。新仪器不需要形式（NN）-N-14-N-15或（OO）-O-16-O-17的低丰度异核硅藻分子，以进行电离研究，因此预计将是有用的在大气科学，星际科学或等离子体物理等领域。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号