Title of article :
A benign, low electron capture agent for negative ion TPCs
Author/Authors :
Martoff، نويسنده , , C.J. and Dion، نويسنده , , M.P. and Hosack، نويسنده , , M. and Barton، نويسنده , , D. and Black، نويسنده , , J.K.، نويسنده ,
Abstract :
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.
Keywords :
negative ion , Dark matter , X-ray polarimeter , diffusion , ion mobility
Journal title :
Astroparticle Physics
