An ion balance for ultra-high-precision atomic mass measurements

被引：108
作者：
Rainville, S
Thompson, JK
Pritchard, DE
机构：
[1] MIT, MIT Harvard Ctr Ultracold Atoms, Elect Res Lab, Cambridge, MA 02139 USA
[2] MIT, Dept Phys, Cambridge, MA 02139 USA
来源：
SCIENCE | 2004年 / 303卷 / 5656期
关键词：
D O I：
10.1126/science.1092320
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
We have developed the analog of a double-pan balance for determining the masses of single molecular ions from the ratio of their two cyclotron frequencies. By con. ning two different ions on the same magnetron orbit in a Penning trap, we balance out many sources of noise and error ( such as fluctuations of the magnetic field). To minimize the systematic error associated with the Coulomb interaction between the two ions, they are kept about 1 millimeter apart from each other, resulting in fractional uncertainty below 1 x 10(-11). Such precision opens the door to numerous applications of mass spectrometry, including metrology, fundamental physics, and weighing chemical bonds.
引用
收藏
页码：334 / 338
页数：5
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