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Time-of-Flight study of molecular beams extracted from the ISOLDE RFQ cooler and buncher

Journal article
Authors Annie Ringvall-Moberg
C. M. Pequeno
J. Cruikshank
T. Giles
Dag Hanstorp
Published in Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms
Volume 463
Pages 522-524
ISSN 0168-583X
Publication year 2020
Published at Department of Physics (GU)
Pages 522-524
Language en
Links dx.doi.org/10.1016/j.nimb.2019.03.0...
Keywords ISOLDE, Molecular dissociation, RFQcb, ISCOOL, dissociation, energy, Instruments & Instrumentation, Nuclear Science & Technology, Physics
Subject categories Physical Sciences

Abstract

Molecular beams injected into the ISOLDE Radio-Frequency Quadrupole cooler and buncher (RFQcb), ISCOOL, have been studied under varying conditions using a new Time-of-Flight (ToF) detector. When a beam of molecules is injected into the RFQcb and interacts with the buffer gas, collisional dissociation processes may occur. In this study, two different beams of molecules, CO+ and Ni-2(+), were separately injected into ISCOOL, and two different buffer gases (pure helium or a 90:10 mixture of helium and neon) were used. The radio-frequency of the RFQcb was varied as the molecules, along with the fragments from the dissociation processes, were extracted from ISCOOL and studied using the new Time-of-Flight detector. The main finding of this work is that the rates for molecular dissociation within ISCOOL were very small for both CO+ and Ni-2(+), with the largest rates found for CO+.

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