The Earliest Stage of Photoinduced Phase Transition in a Strongly Correlated Organic System Using a 10-fs PulseKen Onda, Yoshitaka Matsubara, Tadahiko Ishikawa, Yoichi Okimoto, Shin-ya Koshihara, Takaaki Hiramatsu, Gunzi Saito, Yoshiaki Nakano and Hideki YamochiEPJ Web of Conferences, 41 (2013) 03001DOI: https://doi.org/10.1051/epjconf/20134103001