In:
Review of Scientific Instruments, AIP Publishing, Vol. 36, No. 10 ( 1965-10-01), p. 1443-1447
Abstract:
Singly charged helium ions excited to the 22S½ metastable state were detected by counting the 40.8 eV photons emitted when the ions were quenched in a static electric field. High sensitivity was achieved by using a photomultiplier whose photocathode almost completely surrounded the quenching field. The efficiency of the detecting system was estimated to be (8.3±2.6) 10−3 and the sensitivity was adequate to measure a total flux of 103 He+(2S) ions/sec present in a 1 μA beam of 5 keV ground state He+ ions. The lifetime, τ[sec], of the 22S½ state of He+ was measured as a function of quenching field, U[V/cm] , and was found to be τ=(1.4±0.2) 10−2/U2.
Type of Medium:
Online Resource
ISSN:
0034-6748
,
1089-7623
Language:
English
Publisher:
AIP Publishing
Publication Date:
1965
detail.hit.zdb_id:
209865-9
detail.hit.zdb_id:
1472905-2
SSG:
11
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