High-order Harmonic Field Retrieval in Ethylene Varun Makhija, Jan Tross, Vinod Kumarappan, Michael Spanner, Caterina Vozzi, Carlos Trallero and Salvatore Stagira EPJ Web Conf., 205 (2019) 02005 Published online: 16 April 2019 DOI: 10.1051/epjconf/201920502005