NEW HIGH-RESOLUTION ELECTROSTATIC ION MASS ANALYZER USING TIME OF FLIGHT

被引：31

作者：

HAMILTON, DC ^{[1
]}

GLOECKLER, G ^{[1
]}

IPAVICH, FM ^{[1
]}

LUNDGREN, RA ^{[1
]}

SHELDON, RB ^{[1
]}

HOVESTADT, D ^{[1
]}

机构：

[1] MAX PLANCK INST EXTRATERRESTR PHYS,GARCHING,GERMANY

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 1990年 / 61卷 / 10期

关键词：

D O I：

10.1063/1.1141695

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We have developed a high-resolution mass analyzer that utilizes a measurement of an ion's time of flight (TOF) in an electrostatic field that is configured to produce a harmonic potential. The TOF corresponds to one-half period of a harmonic oscillator and is independent of ion energy, in analogy to the amplitude independence of a harmonic oscillator's period, and is proportional to the square root of the ion's mass per charge ratio. The TOF is determined from a start pulse from secondary electrons produced when the ion passes through a thin carbon foil (1-3 μg/cm2) at the entrance of the TOF region and a stop pulse from the ion striking a microchannel plate (MCP) upon exiting the region. The energy independence of the TOF implies there is no degradation of resolution from energy straggling in the foil. We have achieved a mass resolution M/ΔM (FWHM) of greater than 100 with a laboratory prototype. Three versions of this analyzer for solar wind measurements are included on upcoming space missions and will be flown on the GGS/WIND spacecraft, the SOHO spacecraft, and the ACE spacecraft.

引用

页码：3104 / 3106

页数：3