Discovery of multiple, ionization-created CS2 anions and a new mode of operation for drift chambers

This paper focuses on the surprising discovery of multiple species of ionization-created CS2 anions in gas mixtures containing electronegative CS2 and O2, identified by their slightly different drift velocities. Data are presented to understand the formation mechanism and identity of these new anions. Regardless of the micro-physics, however, this discovery offers a new, trigger-less mode of operation for the drift chambers. A demonstration of trigger-less operation is presented.