Positron lifetime spectrometer using a DC positron beam
US6635871B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2001 |
| Grant date | Oct 21, 2003 |
| Priority date | — |
| Expiry date | Jan 28, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N23/22
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An entrance grid is positioned in the incident beam path of a DC beam positron lifetime spectrometer. The electrical potential difference between the sample and the entrance grid provides simultaneous acceleration of both the primary positrons and the secondary electrons. The result is a reduction in the time spread induced by the energy distribution of the secondary electrons. In addition, the sample, sample holder, entrance grid, and entrance face of the multichannel plate electron detector assembly are made parallel to each other, and are arranged at a tilt angle to the axis of the positron beam to effectively separate the path of the secondary electrons from the path of the incident positrons.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.