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A method for the measurement of radiative lifetimes in ions: The A 2Πu level of F2+

✍ Scribed by J.F.M. Aarts

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
478 KB
Volume
105
Category
Article
ISSN
0009-2614

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✦ Synopsis

A melhod for the measurement of radiative Wetimes in ions is described, in which a uniform electric field exuacts mdiating ions from aviewing field_ Decay curves are obtined by measuring the decrease of light intensity as a function of field strength The method is tested and applied by studying em&ion from the Fz(A 'II,) vibmtional levels u = 6-9, yield-= ing Jifetimes of 1.3 T 0.1 ~1s for u = 6 and l-5 f 0.1 ~5 for v 7-9.

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The radiative lifetimes Trad of the CO\* (A 'Iii. u' = O-9) states have been dctcrmincd using the CO\* (A 'Iii, u'+ X 'Z\*, u") "comet tail" emission. The CO\* (A 2JIil u') states were populated by 100 CV electrons incident on CO. The lifctimns have been obtained by means of the delayed coincidcncc

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The PIFCO techruque. rn which mass-selected photolon-fluorescence photon coinadeaces are counted. IS used to deterrmne the lifetime of the A\*rI, state of FZ+ and Cl : Values of 1.4 ps (F,+ ) and 054 ps (Cl: ) are measured, and they are compared with hfetlme measurements by other methods The Fc rcsu