Eliades, J. A. Zhao, X. -L. Litherland, A. E. Kieser, W. E. 2024-01-20T06:01:24Z 2024-01-20T06:01:24Z 2021-09-04 2015-10-15 0168-583X https://pubs.kist.re.kr/handle/201004/124889 Currently analysis of Cl-36 by accelerator mass spectrometry (AMS) requires large facilities for separation of the isobar S-36. Previously, it has been shown possible to suppress S- by >6 orders of magnitude at low energies in a prototype radio-frequency quadrupole (RFQ) instrument by ion reactions in NO2 gas in the injection line of an AMS system. Reaction products for the negative ions S-, SO- and Cl- with NO2, and S- with N2O, have been surveyed in order to understand isobar attenuation plateaus and the losses of analyte ions. Ion energies were at eV levels, but had a large initial energy spread of at least several eV. Under these conditions, the aggregate total S- and SO- cross sections in NO2 were estimated to be 6.6 x 10(-15) cm(2) and 7.1 x 10(-15) cm(2) respectively and the major reaction channel observed was electron transfer producing NO2-. Other reaction products observed for S- were SO-, SO2-, NS-, and NSO2-. On the other hand, S-, SO- and NS- were found to be largely unreactive with N2O despite the existence of some highly exothermic reaction channels. When Cl- was injected into NO2, reaction products such as CIO- and NO2- were observed only at low levels suggesting that larger Cl- transmissions should be possible with some RFQ design modifications. The CIO- reaction product had only a small attenuation under the experimental conditions, despite having near resonant electron affinity with NO2. (C) 2015 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV CHARGE-TRANSFER REACTIONS ELECTRON-AFFINITIES NITROUS-OXIDE LOW-ENERGY DISSOCIATION Negative ion-gas reaction studies using ion guides and accelerator mass spectrometry II: S-, SO- and Cl- with NO2 and N2O Article 10.1016/j.nimb.2015.07.002 1 NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, v.361, pp.300 - 306 NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 361 300 306 scie scopus 000363345900057 2-s2.0-84943452352 Instruments & Instrumentation Nuclear Science & Technology Physics, Atomic, Molecular & Chemical Physics, Nuclear Instruments & Instrumentation Nuclear Science & Technology Physics Article; Proceedings Paper CHARGE-TRANSFER REACTIONS ELECTRON-AFFINITIES NITROUS-OXIDE LOW-ENERGY DISSOCIATION Radio frequency quadrupole, RFQ Accelerator mass spectrometry, AMS Negative ion NO2, nitrogen dioxide N2O, nitrous oxide