Mind the Gap I: Hα Activity of M Dwarfs Near the Partially/Fully Convective Boundary and a New Hα Emission Deficiency Zone on the Main Sequence - Wei-Chun Jao; Todd J. Henry; Russel J. White; Azmain H. Nisak; Hodari-Sadiki Hubbard-James; Leonardo A. Paredes (2023)