Structural deformation of nitro group of nitromethane molecule in liquid phase in an intense femtosecond laser field

Wang Chang^{1, 2}, Wu Hong-lin³, Song Yun-fei³, Yang Yan-qiang^{2, 3, †}

(color online) Relationship between the pump pulse energy and the signal intensity at the delay times of 250, 500, 1000, 1500, and 2000 fs. The signal intensity of the spectra shows a dramatic increase when the pump pulse energy is increased to 3 and 5 μJ.