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

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

2009-08-20

arxiv.org/abs/0908.2952v1

Nucl.Instrum.Meth.A598:501-504,2009

Physics

Instrumentation and Detectors

Scientific paper

10.1016/j.nima.2008.09.042

We have identified nitromethane (CH$_3$NO$_2$) 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, CS$_2$, but its low atomic number will enable the use of the NITPC as a photoelectric X{}-ray polarimeter in the 1{}-10 keV band.

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