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A benign, low Z electron capture agent for negative ion TPCs

Martoff, CJ
; 
Dion, MP
; 
Hosack, M
; 
Barton, D
; 
Black, JK
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Genre
Journal Article
Date
2009-01-11
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Department
Subject
Dark matter
 Negative ion
 X-ray polarimeter
 Diffusion
 Ion mobility
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http://hdl.handle.net/20.500.12613/6078
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0908.2952v1.pdf
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DOI
10.1016/j.nima.2008.09.042
Abstract
We have identified nitromethane (CH3 NO2) as an effective electron capture agent for negative ion TPCs (NITPCs). We present drift velocity and longitudinal diffusion measurements for negative ion gas mixtures using nitromethane as the capture agent. Not only is nitromethane substantially more benign than the only other identified capture agent, CS2, but its low atomic number will enable the use of the NITPC as a photoelectric X-ray polarimeter in the 1-10 keV band. © 2008 Elsevier B.V. All rights reserved.
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Elsevier BV
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Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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