Observation of monoenergetic electrons from two-pulse ionization injection in quasilinear laser-wakefields Dahkki von der Leyen, M, Holloway, J, Ma, Y, Campbell, PT, Aboushelbaya, R, Qian, Q, Antoine, AF, Balcazar, M, Cardarelli, J, Feng, Q, Fitzgarrald, R, Hou, BX, Kalinchenko, G, Latham, J, Maksimchuk, AM, McKelvey, A, Nees, J, Ouatu, I, Paddock, R, Spiers, B, Thomas, AGR, Timmis, R, Krushelnick, K, Norreys, PA