First Optical Observation of Negative Ion Drift at Surface Pressure

F. D. Amaro, R. Antonietti, E. Baracchini +41

We report the first observation of Negative Ion Drift (NID) at surface pressure of $900\pm 7$ mbar at Laboratori Nazionali del Gran Sasso in a He:CF${}_4$:SF${}_6$ mixture using an op…